Title :

A new chemosynthetic community (ostracods, foraminifers, echinoderms) from Late Jurassic hydrocarbon seeps, south-eastern France Basin

Author(s) :

Forel, Marie-Béatrice [Auteur]
Centre de Recherche en Paléontologie - Paris [CR2P]
Charbonnier, Sylvain [Auteur]
Centre de Recherche en Paléontologie - Paris [CR2P]
Gale, Luka [Auteur]
Geological Survey of Slovenia [GeoZS]
University of Ljubljana
Tribovillard, Nicolas [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Martinez-Soares, Pablo [Auteur]
Institut de Systématique, Evolution, Biodiversité [ISYEB]
Trescastro Bergue, Cristianini [Auteur]
Federal University of Rio Grande do Sul [UFRGS]
Gradstein, Felix [Auteur]
University of Oslo [UiO]
Gaillard, Christian [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]

Journal title :

GEOBIOS

Pages :

1-24

Publisher :

Elsevier

Publication date :

2024

ISSN :

0016-6995

English keyword(s) :

South-eastern France Basin
Oxfordian
Fluid seepage
Echinoderms
Foraminifers
Ostracods

HAL domain(s) :

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

English abstract : [en]

Hydrocarbon seeps represent some of the most extreme marine habitats but are also home to rich communities developed around chemosynthesis rather than photosynthesis. Here we describe the outcrop of Sahune (Drôme department, ...
Show more >Hydrocarbon seeps represent some of the most extreme marine habitats but are also home to rich communities developed around chemosynthesis rather than photosynthesis. Here we describe the outcrop of Sahune (Drôme department, south-eastern France), that illustrates a new seeping site during the Late Jurassic (middle Oxfordian), as formally demonstrated by geochemical proxies. We report the associated fauna composed of foraminifers, radiolarians, crinoids, echinoids and ostracods that all point to seepage at bathyal depth. The foraminifer assemblage and the occurrence of the irregular echinoid Tithonia oxfordiana together point to a middle Oxfordian age. We provide an in-depth analysis of the ostracod community, which is the oldest so far reported in such environments. The new species Procytherura praecoquum may be cognate to the seepage site and could illustrate the oldest known example of pore clusters, sometimes proposed as representing ectosymbiosis. The Sahune assemblage demonstrates that cold seep ostracod communities were already a mixture of taxa from platform and deep-sea oligotrophic environments. The post-Jurassic diversification of ostracods at cold seeps was related to colonization events and diversification of families that have been inhabitants of such ecosystems at least since the Oxfordian. The Sahune record changes our current conception of the deep-sea colonization by the ostracods Tethysia and Procytherura that occurred earlier than traditionally considered.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

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

Source :

Harvested from HAL