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dc.contributor.authorSosa, Graciela-
dc.contributor.authorOriolo, Sebastián-
dc.contributor.authorVan Den Kerkhof, Alfons-
dc.contributor.authorGonzález, Pablo Diego-
dc.contributor.authorOlaizola, Ezequiel-
dc.contributor.authorBechis, Florencia-
dc.date.accessioned2020-12-18T13:52:46Z-
dc.date.available2020-12-18T13:52:46Z-
dc.date.issued2020-08-09-
dc.identifier.citationSosa, G., Oriolo, S., Van Den Kerkhof, A., González, P.D., Olaizola, E., Bechis, F. (2020). Ferropyrosmalite-bearing fluid inclusions in the North Patagonian Andes metasedimentary basement, Argentina: A record of regional metasomatism. American Mineralogist; Preprint; 1-38es_ES
dc.identifier.issn0003-004Xes_ES
dc.identifier.issn1945-3027es_ES
dc.identifier.otherhttp://www.minsocam.org/msa/ammin/AM_Preprints/7525OrioloPreprint.pdfes_ES
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/6616-
dc.description.abstractQuartz segregations in paragneisses from the Paleozoic basement of the North Patagonian Andes contain highly saline multiphase fluid inclusions with the rare daughter mineral ferropyrosmalite detected by Raman analysis, besides halite, sylvite, hematite and/or magnetite. During heating experiments, L-V homogenization occurs (256-515 °C), followed by halite dissolution (287-556 °C) and the dissolution of ferropyrosmalite at 550-565 °C. The latter phase transition triggers the growth of clinopyroxene or amphibole crystals according to the following idealized reactions, written for the Fe-end-members: (1) 𝐹𝑒8𝑆𝑖6𝑂15[(𝑂𝐻)6𝐶𝑙4] + 3𝐶𝑎2+ (𝑎𝑞. ) ↔ 3𝐶𝑎𝐹𝑒𝑆𝑖2𝑂6 + 5𝐹𝑒2+(𝑎𝑞. ) + 4𝐶𝑙−(𝑎𝑞. ) + 3𝐻2𝑂 (2) 4Fe8Si6O15[(OH)6Cl4] + 6Ca2+ (aq.) ↔ 3Ca2Fe5Si8O22(OH)2 + 17Fe2+ (aq.) + 16 Cl- (aq.) + 12OH- + 3H2 Ferropyrosmalite Ferroactinolite During the heating experiment, hematite (when present) transforms to magnetite by the uptake of H2, whereas inclusions without Fe-oxides contain traces of H2 after reaction (2), as demonstrated by Raman analysis. These reactions show that ferropyrosmalite might result from the retrograde reequilibration of these minerals with the brine, implying the uptake of Fe2+, Cl- and H2O, and the enrichment of Ca2+ 38 in the brine. Pervasive fluid flow and fluid-assisted diffusion are recorded by channelway microstructures, healed microfractures and dissolution-reprecipitation phenomena, as demonstrated by cathodoluminescence microscopy. These high salinity brines derived from magmatic sources, possibly of Mesozoic age, were related to a regional metasomatic process, coeval with a widespread granitoid activity.es_ES
dc.format.extentp. 1-38es_ES
dc.language.isoenes_ES
dc.publisherMineralogical Society of Americaes_ES
dc.relation.urihttp://www.minsocam.org/msa/ammin/am_preprints.htmles_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleFerropyrosmalite-bearing fluid inclusions in the North Patagonian Andes metasedimentary basement, Argentina: A record of regional metasomatism.es_ES
dc.typeArticuloes_ES
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)-
dc.description.filiationSosa, Graciela. Geoscience Center, Georg-August-Universität Göttingen, Goldschmidtstrasse. Alemania.es_ES
dc.description.filiationOriolo, Sebastián. CONICET‐Universidad de Buenos Aires. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA). Buenos Aires, Argentina.es_ES
dc.description.filiationVan Den Kerkhof, Alfons. Geoscience Center, Georg-August-Universität Göttingen, Goldschmidtstrasse. Alemania.es_ES
dc.description.filiationGonzález, Pablo Diego. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationOlaizola, Ezequiel. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Río Negro, Argentina.es_ES
dc.description.filiationBechis, Florencia. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Río Negro, Argentina.es_ES
dc.subject.keywordFerropyrosmalite Equilibriumes_ES
dc.subject.keywordFluid Inclusionses_ES
dc.subject.keywordRaman Spectroscopyes_ES
dc.subject.keywordCathodoluminescencees_ES
dc.subject.keywordFluid-Assisted Diffusiones_ES
dc.subject.keywordDissolution-Reprecipitationes_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.materiaCiencias Exactas y Naturaleses_ES
dc.origin.lugarDesarrolloGeoscience Center, Georg-August-Universität Göttingenes_ES
dc.relation.journalissuepreprintes_ES
dc.description.reviewtruees_ES
dc.description.resumen-es_ES
dc.relation.journalTitleAmerican Mineralogistes_ES
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