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3D morphology and timing of the giant fossil pockmark of Beauvoisin, SE Basin of France

Aurelien Gay, Michel Lopez, Jean-Luc Potdevin, Valerie Vidal, German Varas, Alexiane Favier and Nicolas Tribovillard
3D morphology and timing of the giant fossil pockmark of Beauvoisin, SE Basin of France
Journal of the Geological Society of London (September 2018) 176 (1): 61-77

Abstract

In the SE Basin of France (Drome), fossil cold seep structures made of fossil-rich carbonate lenses were identified in the Oxfordian (Late Jurassic) Terres Noires Formation about 30 years ago. To date, all seep sites have generally been studied individually without consideration of any link to neighboring or more distant sites. Based on a detailed fieldwork in the Beauvoisin area and comparison with the modern, active giant Regab pockmark and sandbox experiments, we suggest that this site can now be considered as a 800 m wide fossil analogue of a giant pockmark. It comprises several 4-6 m deep, 80-120 m wide coalesced sub-seep sites. A spatio-temporal 3D reconstruction of the position of these sub-sites shows that the carbonate lenses are organized in clusters with only one cluster active at a given period. Two periods of seep activity are separated by a period of quiescence due to the lateral shift of the feeder conduit beneath the structure. This suggests that even if a seafloor pockmark appears to be inactive, this could be due to the lateral shift of the feeder conduit meaning that the sub-seafloor is still charged in gas.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 176
Serial Issue: 1
Title: 3D morphology and timing of the giant fossil pockmark of Beauvoisin, SE Basin of France
Affiliation: Universite de Montpellier, Geosciences Montpellier, Montpellier, France
Pages: 61-77
Published: 20180924
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 100
Accession Number: 2019-000797
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N44°18'08" - N44°18'08", E05°12'42" - E05°12'42"
Secondary Affiliation: Universite de Lille I, FRA, FranceEcole Normale Superieure de Lyon, FRA, FrancePontificia Universidad Catolica de Valparaiso, CHL, ChileUniversite de Nice Sophia Antipolis, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201902
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