http://rid.unrn.edu.ar:8080/handle/20.500.12049/204 2026-04-19T18:42:12Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/14106 Título: Estructura y fabricación Magnética del Batolito Pilcaniyeu (Jurásico Inferior), Precordillera Patagónica, Río Negro. Autor(es): Peletay Marticorena, Antonella Belen Abstract: The Pilcaniyeu Batholith is a Jurassic plutonic body emplaced in the Patagonian Precordillera (Río Negro). The intrusion comprises three main facies: (1) a granodiorite facies intruded by monzodioritic dikes; (2) a syenogranite facies intruded by aplite–muscovite dikes; and (3) late rhyolitic dikes that cut all previously mentioned units. The country rock is attributed to schists and metatexites of the Cushamen Formation. Among the numerous uncertainties surrounding this intrusive body, questions remain regarding its age and particularly its emplacement conditions. In this regard, Giacosa et al. (2001) proposed that the batholith would have been emplaced during the Early to Middle Jurassic under an extensional or transtensional tectonic regime within dilatational zones associated with the bending of the Río Chico and Pichileufú sinistral faults. However, until now, no structural data were available to support this model. This study demonstrates the potential of integrating igneous petrology, U-Pb zircon geochronology, and structural techniques such as AMS to precisely characterize the internal structure, age, and tectonic emplacement context of igneous suites. Mineral fabrics (magmatic and solid-state) measured in the field are always parallel or subparallel to magnetic fabrics. In this sense, the granodiorite facies exhibits predominantly subhorizontal mineral fabrics, characterized by a subvertical minimum magnetic axis (K3) and a subhorizontal maximum axis (K1) striking NE–SW. The syenogranite facies displays predominantly subvertical fabrics striking NW–SE, with a subhorizontal maximum axis (K1) oriented NE–SW. The LA-ICP-MS U-Pb zircon dating from the syenogranite facies yielded an age of 183.34 ± 0.84 Ma, corresponding to the Early Jurassic (Toarcian). This event is temporally concomitant with the Subcordilleran Batholith and with Stage V1 of the Chon Aike Silicic Large Igneous Province.The integration of structural, microstructural, and magnetic data allowed us to validate the emplacement model of the Pilcaniyeu Batholith as being associated with a transtensional tectonic regime, involving the development of pull-apart-type dilatational zones with an NE-SW–oriented extension direction. This emplacement style is linked to the evolution of a releasing bend between the Río Chico and Pichileufú sinistral faults. 2026-02-23T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/14104 Título: Caracterización mineralógica y geoquímica de la Veta Rocío, distrito La Paloma, Macizo del Deseado, Santa Cruz, Argentina. Autor(es): Catriquir, Melisa Aurora Abstract: The La Paloma district is located in the northeastern sector of the Deseado Massif, Patagonia, Argentina. It comprises a complex system of veins hosted in volcanic rocks of the Middle Jurassic Bajo Pobre Formation. The Sulfuro vein system consists of the Sulfuro, Esperanza, and Rocío veins, and the Princesa-Reyna vein system, both trending NNW to NW. The Duquesa vein system trends E-W, and the Arco Iris system trends NE. The El Molino fault separates the Sulfuro vein system from the other systems mentioned, which are located to the north and northwest of the district (Fernández, 2022). The district's mineral resources are primarily derived from the Sulfide Vein System, which has measured resources of 260,566 ounces of gold (Au) and 637,590 ounces of silver (Ag), with average grades of 5.55 g/t Au and 13.58 g/t Ag (Garrone, 2018). The Rocío Vein exhibits a sub-horizontal geometry of the mineralized ore shoots, with the thickest areas located in the central sector of the analyzed section. The high-grade ore shoots of the elements of economic interest (Au, Ag, Cu, Mo, Pb, Zn, and Sb/As) are most developed in the central sector of the vein. Au is present at shallow levels (120–150 m a.s.l.) in the central sector. In deep zones, the elements Ag, Cu, Mo, and Pb are present, and in shallow zones within this sector, the elements Au and Zn. In the northern sector, small, isolated subsurface spikes of Cu, Mo, Pb, and Zn are present, while in the southern sector, small spikes of Au were observed, while the remaining elements are absent or present in low concentrations. The high geochemical correlation between Ag, Sb, and Se and the identification of polybasite in pulse five could indicate selenium-rich polybasite. The presence of selenium incorporated in the silver sulfosalts could be related to deposits linked to andesitic-type volcanism.Two mineralizing pulses contribute the metals of the Rocío Vein. Pulse 3 contains Mo ± Cu (molybdenite ± chalcopyrite) that precipitated in a millimeter band at the beginning of vein filling. Pulse 5 contains Cu ± Zn ± Pb ± Fe ± Au ± Ag (coarse pyrite, chalcopyrite, sphalerite, galena, tennantite-tetrahedrite, polybasite, and gold microinclusions in pyrite). Based on its metal content, gangue mineralogy, and textures, the Rocío Vein is classified as a low-sulfidation epithermal Au-Ag deposit enriched in Zn + Pb and unusually rich in Mo. The quartz textures (coloform-crustiform banding, mosaic, and ghost sphere) indicate multiple opening and filling events, and the deposition of a silica gel would indicate cooling and silica supersaturation in the fluid. In distal zones of the vein, hydrothermal alteration minerals (chlorite, albite, epidote) could represent propylitic alteration. The phyllosilicates illite and smectite replace the previous minerals and are contemporaneous with the two mineralizing pulses in the vein. 2026-02-23T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13907 Título: Simulación numérica de las fluctuaciones inducidas por marea en acuíferos libres Autor(es): Troncoso, Flavia Marina Abstract: Coastal zones represent one of the most complex hydrogeological scenarios, as the aquifers in these areas are in direct hydraulic contact with freshwater or saltwater bodies. Hydraulic characterization of flow in these aquifers is crucial to optimize production and prevent contamination. Since traditional pumping tests can be costly and prohibitively expensive, alternative non-invasive methods have been implemented, such as the induced tidal method, which was studied through both the development of analytical solutions and numerical methods. However, analytical solutions are valid for very limited cases and are generally not applicable to unbound aquifers. The objective of this work is to use a numerical method to solve the flow equation in an unbound aquifer subject to tidal fluctuations, using an algorithm based on the Finite Element Method. Using this tool, different hypothetical scenarios were studied to analyze the effect of the various hydraulic and geometric parameters that affect the induced tidal response in unbound aquifers. In addition, the hydraulic response was analyzed using a tide gauge signal measured off the coast of the Rio de la Plata during a Sudestada event as a boundary condition. Finally, numerical simulation was used to estimate hydraulic conductivity by fitting signals recorded in two wells near the Rio de la Plata. The resulting fits were compared with previous estimates, validating the usefulness of the proposed numerical tool for this particular case. 2026-02-04T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13801 Título: Geología y cartografía de sitio de interés geológico en la Granodiorita Paso de Icalma entre los lagos Aluminé y Moquehue, Villa Pehuenia, Neuquén. Autor(es): González, Lautaro Abstract: In the locality of Villa Pehuenia, in the central-west region of the Neuquén province, a series of geological interest sites are proposed, associated with endogenous processes studied in the Paso de Icalma Granodiorite (Lower-Upper Cretaceous) and other igneous components that conform the North Patagonian Batholith in the region. Background information was analyzed, and the study area was mapped using satellite images, which were processed to perfom a supervised classification of surface components using parametric methods in ENVI and QGIS. Field samples were described petrographically, and the sites were evaluated based on predefined criteria by Miranda (2018). Based on their characteristics, four GISs were established: “Batea Mahuida Sur- Paredón Viejo,” “Batea Mahuida Norte,” “Playa Lunares,” and “Lago Moquehue,” and a webpage was created. Finally, coordination was carried out with public agencies for their implementation in Villa Pehuenia- Moquehue as a geotourism offering and a scientific-didactic proposal. 2025-12-17T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13698 Título: Caracterización de la alteración Hidrotermal del sistema de vetas en el área del Proyecto Toruel, implicancias en la exploración del distrito minero los Menucos, Río Negro. Autor(es): Antilef, Kevin Nazareno Abstract: The Toruel Project is located in the Los Menucos mining district, 27 km southeast of the town of Los Menucos, Río Negro Province, within the north-central sector of the North Patagonian Massif. Volcaniclastic rocks of the Los Menucos Volcanic Complex are exposed in the area, hosting 11 epithermal veins distributed along a corridor ~5 km wide and 15 km long, oriented approximately N60E. The Toruel vein, mineralized with Ag, Cu, Pb, and Zn sulfides and sulfosalts, and showing Au and In anomalies, is of primary interest due to its higher grades, greater extent, and thickness exceeding one meter. Toward the E–NE, numerous hydrothermal kaolin deposits and occurrences are present. These deposits may represent distal and more surficial expressions of the same system that generated mineralization at Toruel. This study provides a detailed analysis of hydrothermal alteration associated with the vein system in the Toruel Project area, as well as with the kaolin occurrences. The use of remote sensing tools enabled successful mapping of the main hydrothermal alteration minerals, showing good correlation with field observations. Combined analytical techniques (petrography, microscopy, spectrometry, and X-ray diffraction) revealed that both at surface and subsurface the wall rock of the Toruel vein exhibits phyllic to intermediate argillic alteration (sericite–illite±illite–smectite+quartz) in proximal zones, and an intermediate argillic to subpropylitic transition (sericite–illite+smectite–illite±quartz±chlorite) in distal zones. In addition, a supergene alteration was identified at the surface near the vein, composed of jarosite, goethite, and secondary copper minerals. These alterations suggest an increase in pH (5–7) and a decrease in temperature (250–200°C) from proximal to distal zones, features characteristic of a low- to intermediate-sulfidation epithermal system. Spectral analyses revealed variations in the spectral maturity index (IMS) (~crystallinity) and in illite composition, indicating that illite is more sodic and more crystalline near the hydrothermal source. High IMS values (>1) close to the vein correspond to higher-temperature zones, marking the main hydrothermal fluid pathways. As fluids migrated laterally through the wall rock and interacted with it, they progressively neutralized and cooled toward distal sectors, as evidenced by lower IMS values (<1) and their association with higher proportions of smectite. Variations in the Al–OH absorption feature indicate a compositional change from illite with a fengitic tendency in distal positions (Al–OH 2211–2212 nm), to “normal potassic” illite in intermediate zones (Al–OH 2201–2210 nm), and tending toward paragonite (Al–OH 2194–2200 nm) in the vein area. The occurrence of sodic illite with high IMS coincides spatially with higher-grade zones, positioning it as a useful vector to identify the main hydrothermal fluid channels and proximity to mineralized veins. The techniques employed also enabled the definition of advanced argillic hydrothermal alteration (massive quartz+dickite+kaolinite±smectite) in the central sector of the kaolin occurrences, and intermediate argillic alteration (kaolinite±smectite) toward the north. The former possibly represents a transitional or overlapping zone between an acid–sulfate–chloride hypogene condensate environment and a vapor-heated acid–sulfate condensate environment, where acidic conditions remained active at ~200°C. The latter corresponds to a CO2-rich vapor-heated condensate environment in marginal zones, where intermediate argillic alteration developed. Two ledge-type silicified rock bodies with disseminated sulfides have also been observed in the area. This sector displays alteration features characteristic of a high-sulfidation epithermal system. 2025-11-07T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13442 Título: Caracterización Paleoambiental del miembro inferior de la formación Quintuco en el Yacimiento estación Fernández Oro a partir de la integración de datos de corona. Autor(es): Cañas, Juan Manuel Abstract: The Quintuco Formation was deposited during the late Berriasian to early Valanginian and comprises sequences of claystones, calcareous sandstones, limestones, dolomites, and anhydrites, which overlie the Vaca Muerta Formation and underlie the Centenario Formation in the Catriel platform and Bajo de Añelo. This formation, together with it’s proximal platform equivalent, the Loma Montosa Formation, constitutes one of the most diversified and widely distributed carbonate reservoirs in the entire Neuquén Basin. Within the Estación Fernández Oro deposit, located on the morphostructural domain of the Huincul High, the Quintuco Formation consists of a lower sandy member, traditionally interpreted as a wave-dominated shoreface environment influenced by nearby fluvial systems, and an upper calcareous member, which comprises oolitic-bioclastic platform deposits. In this study, 27 m of core samples from well Pi.RN.EFO-76 were analyzed. These cores mainly consist of sandstone facies, with minor occurrences of fine conglomerates and mudstones, generally displaying a coarsening-upward stacking pattern. Additionally, towards the top of the succession, marked signs of stress in the benthic fauna were observed, primarily associated with fluctuations in salinity levels and variations in sedimentation rates. All this evidence allows reinterpreting the unit in this position in the basin, assigning an origin linked with the downdrift progradation of a deltaic system, strongly influenced by fair-weather wave action and storm events, occasionally developing density flows triggered by the destabilization of mouth bars in the delta front. 2025-09-11T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13318 Título: Análisis de huellas de vertebrados en la formación Allen, Valle de la Luna, Paso Córdoba, Río Negro, Argentina. Autor(es): Figueredo Vieyra, Imanol Abstract: The Área Natural Protegida de Paso Córdoba, located in the Río Negro province, is world-renowned for its diverse and abundant paleontological record. In recent years, the study of ichnological discoveries has experienced significant growth. In this Final Degree Project, a previously known locality within the area was studied, the Calvo site, in the Cañadón de la Tranquera, near Valle de la Luna Amarillo. The site displays an approximately 50 square meters surface, which preserves abundant vertebrate footprints in basal levels of the lower member of the Allen Formation (Malargüe Group, Neuquén Basin). At this site, at least four different types of vertebrate footprints have been preserved, each linked to a specific taxonomic group of producers. The first group of imprints includes indeterminate shorebird-type avian footprints, characterized by being tridactyl with narrow, separated digit impressions, wide angles, lateral symmetry, and a delicate, small-sized overall appearance. The second group corresponds to quadruped individuals and it is characterized by handprints with kidney-shaped, pentadactyl, laterally symmetrical impressions, with thick digital impressions with no claw traces, and subcircular foot impressions featuring digits with laterally recurved claw traces. Morphologically, these tracks are linked to sauropod titanosaurs. The third and fourth groupsconsist of tridactyl footprints with lateral symmetry, longer than wide, with a semi-triangular posterior border, and closed digit impressions with acuminated claws. Some of these footprints, referred to here as indeterminate tridactyl Type A, show impressions of thick, short digits and are associated with hadrosaurid ornithopod dinosaurs. The other group, called indeterminate tridactyl Type B, presents slender, elongated digit impressions and is attributed to medium- sized theropod dinosaurs. The surface may represent an ichnocenosis, with producers that were likely part of a paleocommunity either visiting the site to remain there or moving from one area to another without an apparent directionality. The taxonomic groups mentioned as possible producers are classified within the Allenian association. This site likely corresponds to a paleoenvironment of a floodplain with cyclical deposition, characterized by the presence of symmetrical ripple marks, abundant evidence of MISS formation, and traces of invertebrates, represented by numerous specimens of Skolithos isp. and a single specimen referred to as cf. Ophiomorpha isp. Thus, this site and its ichnological record complement the known ichnofauna of this stratigraphic interval. 2025-08-18T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13317 Título: Análisis temporal de la deformación cortical en el norte de Añelo, provincia del Neuquén, mediante Interferometría Diferencial de Radar de Apertura Sintética (DInSAR). Autor(es): Martinez Maliqueo, Esteban Vicente Abstract: This study quantifies surface deformation in the northeastern sector of Añelo, located in the central-western region of Neuquén Province, using Differential Interferometric Synthetic Aperture Radar (DInSAR). The main objective was to investigate the relationship between land subsidence and hydrocarbon-related activities in the area. The use of active remote sensing overcomes the limitations of conventional methods, enabling a detailed geospatial analysis of the Earth's surface. To achieve this, Sentinel-1 Synthetic Aperture Radar (SAR) images were processed using the DInSAR technique. A total of 183 ascending-orbit interferograms were analyzed, covering the period from May 2017 to July 2024. The resulting displacement time series allowed for the estimation of deformation velocity along the satellite’s Line of Sight (LOS). The results revealed a broad area exhibiting significant subsidence, with average rates close to -7 mm/year and cumulative deformation of approximately 60 mm over the study period. The strong correlation between cumulative displacement and cumulative unconventional hydrocarbon production suggests a clear relationship between resource extraction and ground subsidence in the study area. 2025-08-18T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13314 Título: Evolución morfoestructural de las planicies elevadas de El Cuy y Reintería en el antepaís Norpatagónico. Autor(es): Gallego, Fernando Abstract: This study focuses on the development and uplift of the Rentería and El Cuy plains, located in the northern Patagonian foreland in the northwest of the Río Negro Province, Argentina. To carry out the morphotectonic analysis and determine the influence of isostatic adjustment on the uplift of the landscape, it was necessary to estimate the flexural isostatic response to erosion in the retroarc/foreland sector of the study area. Based on the calculated volume of eroded rock (geophysical relief), the isostatic response of the lithosphere in the Andean retroarc, including the area of interest, was modeled. The resulting models and their comparison revealed that the morphology of the elevated plains in the Northern Patagonian foreland has been partially controlled by flexural isostatic compensation in response to intensified erosion during the Pliocene-Pleistocene epoch. 2025-08-14T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13287 Título: Riesgo de Inundación del río Azul en zonas urbanas de Lago Puelo, Chubut, Argentina. Autor(es): Amela, Franco Andrés Abstract: The study analyzes the flood risk in the Isla Sur and Isla Norte neighborhoods of Lago Puelo, Chubut, Argentina, due to the fluvial-morphological dynamics of the Azul River. Using geomorphological, hydrodynamic tools and statistical analysis of historical flow and precipitation data, the causes and magnitude of flood events affecting the region were evaluated. Urban growth without adequate planning, combined with climate change, has increased the vulnerability of these areas. The morphometric analysis of the Azul River basin allowed for a better understanding of the hydrological response of the system to extreme weather events, concluding that urbanization and geomorphological changes over the past decades have exacerbated the flood risk in the study area. Hydrodynamic simulations were performed with the IBER software on a Digital Elevation Model (DEM) to model different flood scenarios associated with return periods of 2, 10, 50, and 100 years, identifying areas at highest risk. The results suggest that the current infrastructure capacity is insufficient to mitigate the effects of future floods, highlighting the need for additional protective works and more sophisticated studies. 2025-08-08T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13284 Título: Análisis de la dinámica costera en la región de las Grutas, provincia de Río Negro Autor(es): Sbaizero, Lautaro Adrián Abstract: In this manuscript, the geological and geomorphological study of the resort town of Las Grutas is carried out, in order to understand the evolution of the local coastal dynamics and how this is related to the retreat of the cliffs exposed there. From surveys carried out with UAV, based on the digital elevation models (DEM) obtained in 2021 and 2022, it was possible to quantify the variation in the volume of beach deposits, as well as topographic profiles of the area. Furthermore, using the orthomosaics generated from the flights, in comparison with historical aerial photographs, it was possible to estimate a speed of retreat of the cliff between the years 1969 and 2021, obtaining an average value of 3 meters of retreat in the least affected sectors and up to approximately 6 meters in the most affected sectors. Processes and factors that condition the coastal zone were identified, including marine erosion processes, which result in basal cavities and caves present in the cliffs, channels and grooves on the abrasion platform, and subaerial processes, which in certain sectors result in resulting in areas with landslides. Also, conditioning factors of the stability of the cliff were identified, related to its lithology, structures and slopes. Monitoring with UAVs is proposed as a continuous coastal monitoring method, since its centimter spatial resolution provides the possibility of quantifying processes that occur with a high level of detail. 2025-08-07T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13014 Título: Geología del sector medio de la quebrada de Hualcupén, complejo volcánico Caviahue-Copahue, provincia de Río Negro. Autor(es): López, Florencia Natali Abstract: This final degree project aims to analyze the geology of the middle sector of the Hualcupén ravine, part of the Caviahue-Copahue Volcanic Complex, located in the Southern Volcanic Zone of the Andes. Through geological mapping and petrographic analysis, six volcanic and volcaniclastic facies were identified and described, enabling the reconstruction of the geological evolution of the study area. The results include the characterization of facies belonging to the Hualcupén Formation, the Riscos Bayos Formation, and the Carreri Ignimbrite. These units are associated with different types of volcanic activity: the Hualcupén Formation is related to more effusive events linked to a stratovolcanic system, while the Riscos Bayos Formation and the Carreri Ignimbrite correspond to explosive events related to the formation of the Las Mellizas caldera and the eruption of the Cerro Bayo dome, respectively. Based on this analysis, three main geological stages were identified: the first corresponds to the development of a stratovolcano that gave rise to the Hualcupén Formation; the second is associated with the collapse of the Las Mellizas caldera, which produced the facies of the Riscos Bayos Formation; and the third is marked by an explosive event of the Cerro Bayo dome that led to the deposition of the Carreri Ignimbrite. 2025-05-19T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/13005 Título: Micropalentología de las sedimentitas en el contacto entre las formaciones Anacleto y Allen (área natural protegida Paso Córdoba, Río Negro): Indiferencias paleoambientales Autor(es): Gigli, Ayelén Abstract: This study analyzes the transition between the Anacleto and Allen formations (Neuquén Basin, Late Cretaceous) in the Paso Córdoba Protected Natural Area, Río Negro Province, Argentina. The Neuquén Basin is one of the most important sedimentary basins in the country due to its complex geological history and its relevance in natural resource exploration. The Anacleto and Allen formations, belonging to the Neuquén and Malargüe Groups, respectively, represent sedimentary paleoenvironments of great paleontological and stratigraphic interest. Broadly speaking, the Anacleto Formation is characterized by predominantly fluvial deposits, while the Allen Formation reflects a transition toward coastal and eolian systems. A 9 m thick stratigraphic section including the contact between both units was measured and sampled. The base of the section consists of red, reddish-brown, and gray mudstones, with pink and whitish concretionary limestones, typically associated with the Anacleto Formation. The section continues with sandstones and mudstones of continental origin, along with marine-littoral deposits, characteristic of the Allen Formation. Five samples were collected from the first 2 m of the measured section, corresponding to fine sediments with no evident sedimentary structures, interpreted as low-energy deposits, probably from a floodplain environment. The samples were processed by wet disaggregation and sieving, removing the fraction smaller than 63 μm. Microfossils were collected using the picking technique under a binocular microscope. Charophytes, ostracods, gastropods, and bivalves were identified, analyzed, and documented through Scanning Electron Microscope (SEM) observations. Although poor preservation hindered precise species identification, the results allowed for the characterization of the main fossil groups and their relationship with the 4 paleoenvironments represented in the sequence. The presence of freshwater, brackish, and marine taxa indicates environmental fluctuations during the deposition period. Additionally, the coexistence of organisms with differing ecological requirements at the same level suggests the influence of sediment reworking phenomena and consequent time-averaging (i.e., the mixing of remains from different periods of accumulation within a single deposit). The results provide new insights into paleoenvironmental changes in the Neuquén Basin during the Late Cretaceous, reinforcing the interpretation of a sedimentary dynamic influenced by variations in salinity and depositional energy. 2025-05-19T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12930 Título: Caracterización Estática de la Formación Centenario en el Yacimiento Estación Fernández Oro, provincia de Río Negro, Argentina. Autor(es): Maydana, Facundo Emanuel Abstract: This study addresses the static characterization of the Centenario Formation in the Estación Fernández Oro (EFO) field, located in the Neuquén Basin, Argentina. The main objective is to evaluate its potential as a reservoir for the reinjection of flowback wáter, a key practice for the controlled and safe disposal of this fluid in compliance with a current environmental regulation. The methodology combines sedimentological, stratigraphic, and structural analyses, integrating well logs, cutting descriptions, and petrophysical calculations. Data from 60 wells were processed using tNavigator software, allowing for the development of structural, isopach, and isoproperty models. These models facilitated the identification of litofacies distribution and the estimation of key properties such as effective porosity and clay volumen. The results show that the sandstones of the Lower Centenario Member exhibit favorable characteristics as reinjection reservoirs, highlighted by their quartzose composition, médium grain size, and good petrophysical properties. In contrast, the sum of the clayey levels of the Upper Centenario Member acts as a natural hydraulic seal, ensuring the containment of injected fluids and preventing their migration of upper levels. This interpretation is supported by the integration of well log data and cutting descriptions, which allowed for the delineation of the horizons of both members of the formation. The structural análisis revealed a differential inclinaton of the member tops relative to the base, atributted to post-depositional tectonic events. This configuration, together with the presence of hydraulic seals, ensures the system’s stability and the retention of injected fluis in the subsurface. This research provides a comprehensive evaluation of the Centenario Formation as a potential unit for flowback wáter reinjection. The combination of a robust methodology with an analysis of the litofacies properties enabled the identification of suitable áreas for the location of reinjection Wells, contributing to the efficient and environmentally safe management of flowback water. 2025-05-09T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12929 Título: Análisis petrográfico y geoquímico de las unidades magmáticas del Volcán Auca Mahuida, Provincia del Neuquén, Argentina Autor(es): Mora, Roberto Patricio Abstract: Auca Mahuida Volcano, located 50 km north of Añelo (37°44' S, 68°55' W), in the Province of Neuquén, lies in the northeastern part of the Neuquén Basin and represents the southernmost unit of the Payenia Volcanic Province. It is an extensive volcanic structure composed of a succession of lavas accumulated during the Pleistocene, overlying sedimentary units of the Neuquén and Malargüe groups. In this work, a geochemical and petrographic study was conducted on igneous rock samples from units located in the subsurface of the eruptive center of Auca Mahuida Volcano. Additionally, well logging data provided by Y.P.F. S.A., which operates the Auca Mahuida Volcano and Las Manadas fields, was analyzed. Based on the results of the geochemical classification of subsurface samples, the petrological analysis of cutting samples and thin sections, and the interpretation of well logging data, a series of intrusive igneous bodies, such as a laccolith, dikes, and sills, were modeled and classified, allowing for an expanded understanding of the Auca Mahuida Volcano structure and its subsurface architecture. 2025-05-09T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12928 Título: Estudio sobre las posibilidades de almacenaje de CO2 en depósitos clásticos de la región noroeste de la cuenca Neuquina. Autor(es): Rey Monti, Facundo Mariano Abstract: Carbon capture and storage (CCS) is emerging as a key technology for mitigating climate change, providing a transitional solution between the use of fossil fuels and the adoption of renewable energy. This study aims to evaluate the clastic deposits of southern Mendoza and northern Neuquén as potential CO2 reservoirs and estimate their storage capacity. Through the analysis of well data, electric logs, 3D seismic data, and previous geological studies, the potential reservoirs and their capacity to store CO2 were assessed. The studies indicate that the petrophysical properties of the reservoirs in the study area are less favorable compared to other regions in northern Neuquén, limiting the viability of future CO2 storage projects. Furthermore, regional structures in the southern part of the area, which have the potential to act as CO2 traps, are affected by high-angle deep faults, compromising the integrity of regional seals and their ability to contain CO2. Regarding storage capacity, estimative calculations show a reduced potential, significantly lower than that of major global projects, indicating the need to evaluate alternative areas for CO2 storage. 2025-05-09T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12836 Título: Estudio geológico estructural del basamento metamórfico - ígneo en el cañadón Chacay Huarruca, Macizo Nordpatagónico Occidental, Río Negro Autor(es): Colipán Eduards, Esteban Emanuel Abstract: The aim of this final degree project is the geological-structural analysis of the basement igneous and metamorphic rocks that outcrop in the Chacay Huarruca Creek located west of the locality of Rio Chico, in the Nordpatagonian Precordillera of the Rio Negro province (41°42’12” S - 70°29’55” W). The basement is composed of the Comallo Metamorphic Complex and Mamil Choique Plutonic Complex. The Comallo Metamorphic Complex comprises intercalations of high-grade schists, paragneisses, and migmatites (stromatites) with quartzose meta-sandstones. The regional foliation is NW-SE trending and high-grade regional metamorphism reached the amphibolite facies. The granitic leucosome of the migmatites is associated with dikes of similar composition, intruded into the metamorphic host rock which is concordant with the planar fabric. The Mamil Choique Plutonic Complex is represented by the Tunel Tonalite pluton and minor bodies of other granitoides. The pluton cuts the fabric of the rocks deformed and metamorphosed of the Comallo Metamorphic Complex. It has a quartz dioritic to tonalitic composition with biotite and hornblende-biotite bearing, which exhibits two main fabrics. One magmatic that is massive, equigranular to weakly foliated, and another is tectonic represented by mylonites that exhibit a mylonitic foliation. The geological evolution of the basement comprises deformation, metamorphism, and magmatism events associated with the Gondwanan orogenic cycle, which took place along the SW Gondwana margin during the Late Paleozoic. After the sedimentation of the metamorphic protolith during the Llandoverian (Silurian), the Comallo Metamorphic Complex was affected by three deformation episodes recognized from D1 to D3 and associated with metamorphisms M1 to M3. It was also intruded on by intrusive bodies from the Mamil Choique Plutonic Complex. D1-D2 are episodes of ductile compressive and coaxial deformation. The regional metamorphism is dynamothermal, with a prograde evolution from M1 greenschist facies to M2 amphibolite facies. The NW-SE trending penetrative fabric was formed during the tectonic-thermal climax D2-M2 in the Lower Carboniferous before the intrusion of the Tunel Tonalite that occurred in the Lower Permian. It was followed by D3-M3 which is developed in ductile shear belts that affected the tonalitic pluton and its host rock, causing the formation of mylonites and the retrogradation of the metamorphic host rocks. After the exhumation of the basement, the D4-M4 event is Andean and had a regional character due to the reactivation of the Gondwanan structures. 2023-07-01T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12601 Título: Caracterización geológica, estructural y de las alteraciones de las vetas del torreón, Andacollo, Neuquen. Autor(es): Flores, Ariadna Lorena Abstract: This work presents new lithological, structural, and alteration descriptions associated with the E-W to ENE-WSW and NE-SW veins, exposed along the southern margin of the Torreon stream (Andacollo, Neuquén), in the southwestern part of Cordillera del Viento (-37°10´46”, -70°38´36.10”). The units that outcrop in the region are structurally conditioned by their periclinal closure and present structures associated with three orogenic cycles: Chanic, Gondwanic, and Andean. Consequently, lineaments of various orientations can be observed, potentially playing a key role as structural controls of the vein systems. In the study area, black tuffs from the Arroyo del Torreon Formation, corresponding to the Cerro San Pedro Member (Mississippian), crop out in contact with its upper member (Sofía Member, Upper Mississippian), overlain by polymictic conglomerates from the Huaraco Formation (Upper Pennsylvanian). Above these units, in erosional unconformity, lie pyroclastic facies of the Cordillera del Viento Formation (lower Jurassic). Aphanitic andesitic-basaltic dikes cut through this formation and Sofia Member. Porphyritic dacitic dikes, assignable to the Naunauco Group (71±1 Ma), cut across the entire stratigraphic sequence. Two distinct groups of veins were identified, differing in their structural, morphological, and textural characteristics. The E-W to ENE-WSW veins are emplaced in sinistral strike- slip faults, previously normal, and are hosted in the Sofía Member and the Huaraco and Cordillera del Viento Formations. On the other hand, the NE-SW veins are extensional in nature and are hosted exclusively in the Sofía Member. Additionally, two kinematics faults populations were identified in the E-W and ENE- WSW orientations. Kinematic population 1 is linked to the Huarpic phase (Upper Triassic-Lower Jurassic) in a N-S to NNW-SSW extensional regime, while kinematic population 2 corresponds to the reactivation of pre-existing (normal) faults under a NNE- SSW to WSW-ENE compressional regime. The geometric and kinematic compatibility between both groups of faults (E-W and ENE-WSW) suggests they could be part of the same system. Using combined techniques (visual estimation, petrographic analysis, X-ray diffraction, and spectrometry), three types of alterations were identified in all the veins: silicification and argillic-phyllic alteration (illite-sericite±quartz) near the veins, transitioning to intermediate argillic alteration (illite±smectite±quartz) in intermediate zones for the E-W to ENE-WSW veins, and propylitic alteration in distal zones, represented by illite±chlorite±quartz in the NE-SW veins, and illite±chlorite±calcite±quartz in the E-W veins. These alterations suggest an increase in pH (5 to 7) and a decrease in temperature (250°C to <200°C) from proximal to distal zones, characteristic of an intermediate to low- sulfidation epithermal system. Spectrometry analyses revealed that the dominant white mica is illite, whose spectral maturity (MSI) varies with proximity to the veins. High MSI values (>1) near the fault-vein zones indicate areas of higher temperatures where hydrothermal fluids circulated, later migrating laterally through the host rocks, interacting with them, and cooling, resulting in lower MSI values (~1). The variation in the Al-OH absorption position suggests compositional changes in the illites, with a trend from paragonitic to normal potassic illite in the NE-SW veins (AlOH 2199 to 2208 nm), reflecting a sodium-rich environment, and an increase in K, Fe, and Mg contents towards more distal areas. 2025-02-06T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12199 Título: Determinación de los blancos de exploración en base a la respuesta espectral de los minerales de alteración hidrotermal en los alrededores del Establecimiento Ganadero Don Raúl, Macizo Nordpatagónico, Patagonia Argentina. Autor(es): Pessoa García, Marcos Yoel Abstract: The northeastern sector of the North Patagonian Massif hosts mineralization formed during the Gondwanic and Mesozoic metallogenic epochs. Three metalotects are relevant during these epochs: i- Permian granites, ii- Triassic ignimbrites, and iii- Jurassic lavas and ignimbrites. This study aims to contribute to the metallogenetic exploration of the region through the investigation of hydrothermal alteration zones surrounding the Establecimiento Don Raúl, located between Valcheta and Aguada Cecilio, Río Negro province. With this purpose, alteration targets that could potentially lead to the discovery of commercially viable mineral deposits were identifield. The first step in research was to compile bibliographic and cartographic resources from the study area. Subsequently, ASTER satellite images were employed to identify potential hydrothermal alteration areas. These images were processed using ENVI 4.7 software, applying radiance corrections to the VNIR, SWIR, and TIR bands. To asses the presence and distribution of alteration minerals, different indices (OHIa, ALI, CI swir, Cao), RGB composites (468, 654) as well as RGB ratio composites were generated. Through a comprehensive analysis of the information obtained from the ASTER satellite images and the cartography, produced by photointerpretation and field mapping, hydrothermal alteration targets were defined and located in outcrops of the Jurassic lava and ignimbrite metalotect belonging to the Marifil Volcanic Complex. Petrographic studies suggest that the targets exhibit an alteration paragenesis consisting of quartz + white micas, kaolinite, + iron oxides and hidroxides. This paragenesis of alteration minerals is consistent with phyllic and argillic type alterations. Finally, using all the available information, detailed geological and alteration mapping of the study area was produced. Since no further magmatic activity was registered in the area, and considering the close spatial relation of the alteration with the Marifil Volcanic Complex rocks, a Jurassic age is proposed for phyllic and argillic alteration founded. The value of multi-spectral satellite imagery lies in its ability to identify various hydrothermal alteration zones and establish their connection to its host rocks (metallotect). In this study, a genetic association is suggested between the examined hydrothermal alterations and the Jurassic lavas and ignimbrites in the region. Based on the findings of this study, and taking into account previous research in the region, the methodology applied here could prove valuable in other areas of the North Patagonian Massif where Jurassic lavas and ignimbrites with metallotects potential are found Likewise, this approach could be extended to other regions with similar metallotects characteristics, enabling the identification and expansion of explorations targets. 2024-11-04T00:00:00Z http://rid.unrn.edu.ar:8080/handle/20.500.12049/12186 Título: Caracterización estratigráfica del Complejo Volcánico Marifil (Jurásico Inferior) al sudeste de Valcheta, provincia de Río Negro Autor(es): Schiappa Pietra, María Belén Abstract: The aim of this study is to contribuite to the cartography and stratigraphic analysis of the outcrops of the Marifil Volcanic Complex. The study area is located in the North Patagonian Massif, 20 km SE of the Rio Negro town of Valcheta, between coordinates 40°47' and 40°44' south latitude and meridians 66°1' and 65°56' of west longitude, in the surroundings of the Don Raúl Establishment. The Marifil Volcanic Complex, in the study area, is composed of volcaniclastic and volcanic rocks. Stratigraphic profiles were made, and from these, an integrated stratigraphic column that represents the succession of rocks in the study area. The volcaniclastic rocks in the study area are made up of sandstones, conglomerates and lapillitic tuffs. At the base of the rock succession, sandstones and conglomerates were identified in small outcrops. These rocks are mainly composed of clasts of volcanic origin of predominant rhyolitic. Above the previous units, conglomeratic sandstones were found with a higher percentage of volcanic clasts and, culminating the volcaniclastic succession, extensive banks of lapillitic tuffs were identified. Finally, the stratigraphic succession of the study area ends with coherent volcanic rocks assigned to rhyolitic lavas. The sandstones and conglomerates of the study area were compared with other rocks from the surrounding area, assigned to the Puesto Piris Formation and associated with the rocks presented, finding compositional differences between them. 2024-11-04T00:00:00Z