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Lower Aptian Rhizocorallium surfaces on the southern edge of the Vocontian Basin, southeastern France; markers of local dynamics and their relation to a global anoxic event

Pierre Cotillon, Martial Banvillet, Christian Gaillard, Daniele Grosheny and Davide Olivero
Les surfaces a Rhizocorallium de l'Aptien inferieur sur la bordure meridionale du bassin vocontien (France Sud-Est), marqueurs de dynamiques locales; leur relation avec un evenement anoxique global
Bulletin de la Societe Geologique de France (March 2000) 171 (2): 229-238

Abstract

On the North-Provence margin, an omission surface with Rhizocorallium often characterizes the sub-Aptian discontinuity between Eocretaceous carbonates and Aptian-Albian marls. This discontinuity is recorded in various successions described along a palaeoslope joining the Vocontian Basin and the Provence platform, between the Jabron valley in the west and the Var valley in the east. The successions including Aptian marls always exhibit an omission surface with Rhizocorallium. Through this area, the Aptian discontinuity equates to at least part of the Goguel Level. The latter is represented by black shales occurring in the Vocontian Basin at the top of Deshayesi zone and is a regional expression of the global anoxic event OAE1a. Thus, the surface with Rhizocorallium can be regarded, on the North-Provence margin, as a marker coincident with the onset of the anoxic event which, in the Vocontian basin, succeeded to a nannoconid crisis. Representing a short event, the surface is also a marker of various processes: (1) current activity, deduced from a dominant orientation of Rhizocorallium. The Barremian-early Aptian carbonate succession is strongly eroded by the formerly more active currents along the Peipin Channel, south-east of Sisteron; these currents also led to the omission of the Bedoulian (= carbonate Lower Aptian) to upper Valanginian series from the top of the hemipelagic palaeoreliefs in the eastern Castellane arc; (2) tectonic activity in the Lower Aptian, marked by N080 degrees to N100 degrees extension faults and slumping of a semi-lithified carbonate sediment. Slumped material and fault scarps are burrowed with Rhizocorallium; (3) differential lithification of the Barremian limestones which has led to distinctive types of current erosion.


ISSN: 0037-9409
EISSN: 1777-5817
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 171
Serial Issue: 2
Title: Les surfaces a Rhizocorallium de l'Aptien inferieur sur la bordure meridionale du bassin vocontien (France Sud-Est), marqueurs de dynamiques locales; leur relation avec un evenement anoxique global
Translated Title: Lower Aptian Rhizocorallium surfaces on the southern edge of the Vocontian Basin, southeastern France; markers of local dynamics and their relation to a global anoxic event
Affiliation: Universite Lyon I, Villeurbanne, France
Pages: 229-238
Published: 200003
Text Language: French
Summary Language: English
Publisher: Societe Geologique de France, Paris, France
References: 20
Accession Number: 2000-041828
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 1 table, geol. sketch maps
N43°30'00" - N45°00'00", E05°30'00" - E07°00'00"
Secondary Affiliation: Universite Louis Pasteur, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200014
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