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Título: Palaeoenvironmental conditions for the preservation of organic matter during the late Hauterivian in the Neuquén Basin (Western Argentina)
Autor(es): Omarini Fernández, Julieta
Lescano, Marina
Odino Barreto, Andrea Lorena
Campetella, Débora Mical
Tunik, Maísa Andrea
Garbán, Grony
Brea, Fabián
Erra, Georgina
Aguirre Urreta, Beatriz
Martinez, Mathieu
Fecha de publicación: 2020
Editorial: Elsevier Science
Citación: Omarini, J., Lescano, M. Odino-Barreto, A., Campetella, D., Tunik, M., Garbán, G., Brea, F., Erra, G., Aguirre-Urreta, B., Martinez, M., (2020). Palaeoenvironmental conditions for the preservation of organic matter during the late Hauterivian in the Neuquén Basin (Western Argentina). Marine and Petroleum Geology; 120; 104469.
Revista: Marine and Petroleum Geology
Abstract: The Agua de la Mula Member of the Agrio Formation, comprises marine deposits accumulated in a mixed carbonate-siliciclastic outer ramp during the late Hauterivian. An innovative multi-proxy study that includes sedimentological, geochemical and paleobiological data from the El Portón section were combined in order to constrain the environmental context. Two major sedimentary cycles have been recognised (TST-HST) reflecting the position of both distal and proximal sediments within the depositional system. The distal outer ramp deposits (FA1) are predominantly characterised by carbonate-bearing mudstones, with TOC content up to 4.43 wt% TOC (average 1.62 wt%) and Type II marine-derived amorphous organic matter. The high TOC could be reflecting enhanced bioproductivity during periods of decreased salinity as mirrored by peaks of Micrantholithus, and reduced dilution by siliciclastic material in a distal setting. Conversely, the proximal outer ramp succession (FA2) shows a higher siliciclastic pattern, along with the terrestrial organic matter signal (Type II-III kerogen) and TOC content around 1 wt%(average 1.05 wt%). In this interval primary production is associated with more stable conditions and stratified water, as reflected in peaks of Nannoconus. These conditions allowed a greater diversity and high abundances of calcareous nannofossil assemblages.
Resumen: -
Identificador DOI:
ISSN: 0264-8172
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Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899

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