Titre :

Reconstruction of palaeoenvironmental conditions of the Vaca Muerta formation in the southern part of the Neuquén Basin (Tithonian-Valanginian): Evidences of initial short-lived development of anoxia

Auteur(s) :

Krim, Nesma [Auteur]
Laboratoire des Fluides Complexes et leurs Réservoirs [LFCR]
Centre scientifique et Technique Jean Feger [CSTJF]
Tribovillard, Nicolas [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Riboulleau, Armelle [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bout Roumazeilles, Viviane [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bonnel, Cédric [Auteur]
Laboratoire des Fluides Complexes et leurs Réservoirs [LFCR]
Imbert, Patrice [Auteur]
Centre scientifique et Technique Jean Feger [CSTJF]
Aubourg, Charles [Auteur]
Laboratoire des Fluides Complexes et leurs Réservoirs [LFCR]
Hoareau, Guilhem [Auteur]
Laboratoire des Fluides Complexes et leurs Réservoirs [LFCR]
Fasentieux, Bertrand [Auteur]

Titre de la revue :

Marine and Petroleum Geology

Pagination :

176-201

Éditeur :

Elsevier

Date de publication :

2019-05

ISSN :

0264-8172

Mot(s)-clé(s) en anglais :

Marine and Petroleum Geology Neuquén Basin
Vaca Muerta Formation
Source rocks
Clay mineralogy
Trace elements
Paleoenvironmental evolution
Particulate shuttle effect

Discipline(s) HAL :

Planète et Univers [physics]/Sciences de la Terre/Océanographie

Résumé en anglais : [en]

The Vaca Muerta Formation is a famous source rock being largely present in Argentina. The formation was examined in the southern part of the Neuquén Basin through clay-mineral assemblage composition, as well as organic and ...
Lire la suite >The Vaca Muerta Formation is a famous source rock being largely present in Argentina. The formation was examined in the southern part of the Neuquén Basin through clay-mineral assemblage composition, as well as organic and inorganic geochemical characteristics. In total, 259 samples were analyzed on both sides of the Huincul Arch (major E-W structure that divided the southern part of the basin into two depocentres). South to this structure (Picún Leufú area), the total organic carbon content (TOC) can reach 20% but is generally ranging from 0.1 to 6%. To the north (Covunco area), average TOC does not exceed 0.5%. Clay-mineral assemblages indicate an evolution of the sources of clastic supply through time in response to evolving weathering/erosion at the regional scale. Redox-sensitive trace-element distribution shows that the particulate iron shuttle process operated, with an initially-euxinic depositional environment that evolved rapidly to oxygenated seawater and suboxic sediments. Our results suggest an episodically restricted circulation pattern that occurred at the beginning of the deposition of the Vaca Muerta Formation (highest TOC content).Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL