Palaeoenvironmental conditions for the preservation of organic matter during the late Hauterivian in the Neuquén Basin (Western Argentina)

Julieta Omarini (1) , Marina Lescano (2) , Andrea Lorena Odino-Barreto (3) , Débora Campetella (1) , Maisa Tunik (1) , Grony Garbáne (4) , Fabián Brea , Georgina Erra , Beatriz Aguirre-Urreta (2) , Mathieu Martinez (5)

1 UNRN - Universidad Nacional de Río Negro
2 INDEAN - Instituto de Estudios Andinos “Don Pablo Groeber”
3 UBA - Universidad de Buenos Aires [Buenos Aires]
4 UCV - Universidad Central de Venezuela
5 GR - Géosciences Rennes

The Agua de la Mula Member of the Agrio Formation in the Neuquén Basin, 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 most distal and proximal sediments in 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 nannofossils assemblages.

Keywords: Organic geochemistry; Total organic carbon (TOC); Hydrocarbon potential; Palaeoproductivity; Palaeoceanographic changes; Agua de la Mula member; Agrio formation; Cretaceous

Domains: Stratigraphy; Geochemistry

Julieta Omarini, Marina Lescano, Andrea Lorena Odino-Barreto, Débora Campetella, Maisa Tunik, et al.. Palaeoenvironmental conditions for the preservation of organic matter during the late Hauterivian in the Neuquén Basin (Western Argentina). Marine and Petroleum Geology, 2020, 120, pp.104469. ⟨10.1016/j.marpetgeo.2020.104469⟩. ⟨insu-02863256⟩