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Age and depositional environment of the Sainte-Anne Formation (Armorican Massif, France); the oldest (Emsian) evidence for mountain erosion in the Variscan Belt

Celine Ducassou, Christine Strullu-Derrien, Michel Ballevre, Marie-Pierre Dabard, Philippe Gerrienne, Hubert Lardeux and Cecile Robin
Age and depositional environment of the Sainte-Anne Formation (Armorican Massif, France); the oldest (Emsian) evidence for mountain erosion in the Variscan Belt (in Mechanics of the Variscan Orogeny; a modern view on orogenic research; Part 2, Michel Faure (editor), Patrick Ledru (editor) and Voytech Janoucek (editor))
Bulletin de la Societe Geologique de France (October 2009) 180 (6): 529-544

Abstract

The palaeogeography of the internal zones of the Variscan belt during the early stages of the convergence remains unclear. Sedimentary sequences that recorded the denudation of an early relief have generally been removed by erosion. In the Chalonnes area (southeast of the Armorican Massif), the reefal carbonates of the Chalonnes Formation (Fm) are overlain by the immature, poorly-sorted sandstones of the Sainte-Anne Fm. This formation is characterised by the occurrence of gravity flow deposits and contains immature and poorly sorted sandstones with a large amount of plant debris and lithic fragments, suggesting a depositional environment in a delta front dominated by floods. A revision of the palaeoflora content allows to assign an Emsian age to the Sainte-Anne Fm. Lithic fragments are mainly of sedimentary and volcanic origin, suggesting moderate erosion level of the source area. Palaeocurrent data indicate a southern origin for the sediments. These features collectively demonstrate that the Sainte-Anne Fm is the record of the erosion of a continental area located farther south, and experiencing incipient tectonic uplift during the Emsian. The Sainte-Anne Fm could represent therefore the earliest record in France of the very first stages of the Variscan orogeny.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 180
Serial Issue: 6
Title: Age and depositional environment of the Sainte-Anne Formation (Armorican Massif, France); the oldest (Emsian) evidence for mountain erosion in the Variscan Belt
Title: Mechanics of the Variscan Orogeny; a modern view on orogenic research; Part 2
Author(s): Ducassou, CelineStrullu-Derrien, ChristineBallevre, MichelDabard, Marie-PierreGerrienne, PhilippeLardeux, HubertRobin, Cecile
Author(s): Faure, Micheleditor
Author(s): Ledru, Patrickeditor
Author(s): Janoucek, Voytecheditor
Affiliation: Universite de Rennes I, Geosciences Rennes, Rennes, France
Pages: 529-544
Published: 200910
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
Meeting name: Special meeting of the French and Czech Geological Societies
Meeting location: Orleans, FRA, France
Meeting date: 20070913Sept. 13-15, 2007
References: 126
Accession Number: 2010-010533
Categories: StratigraphyStructural geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 6 tables, geol. sketch maps
N46°30'00" - N49°45'00", W04°49'60" - E00°00'00"
Secondary Affiliation: Universite d'Angers, FRA, FranceUniversite de Liege, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201007
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