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Depositional conditions of carbonate-dominated palustrine sedimentation around the K-T boundary (Facies Rognacien, northeastern Pyrenean foreland, southwestern France)

Daniel Marty and Christian A. Meyer
Depositional conditions of carbonate-dominated palustrine sedimentation around the K-T boundary (Facies Rognacien, northeastern Pyrenean foreland, southwestern France) (in Paleoenvironmental record and applications of calcretes and palustrine carbonates, Ana Maria Alonso-Zarza (editor) and Lawrence H. Tanner (editor))
Special Paper - Geological Society of America (2006) 416: 169-187

Abstract

The Facies Rognacien is a sequence of highly bioturbated and pedogenically modified palustrine carbonates that were deposited under oxic conditions around the Cretaceous-Tertiary (K-T) boundary in the northeastern Pyrenean foreland basin (SW France). The sedimentary structures and early diagenetic features identified (mottling, nodule formation, brecciation, pseudomicrokarst, cracking, charophytes, Microcodium) suggest deposition in a palustrine environment between the subarid and intermediate climate type. Sedimentological and paleoecological analysis enables us to distinguish two facies associations, the lacustrine pond facies and the freshwater marsh facies associations. The majority of the carbonates are attributed to the freshwater marsh facies. The lacustrine pond facies occurs only in isolated paleolows, and is identified on the basis of its paleobiological content (charophytes, ostracodes). This suggests that the palustrine carbonates of the Facies Rognacien were deposited in a seasonal wetland (carbonate-producing freshwater marsh), rather than in the marginal zone of a large, shallow lake. In this wetland paleoenvironment, all carbonates underwent widespread pedogenesis, and small, ephemeral ponds are of limited distribution, most likely recording deposition in paleolows.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 416
Title: Depositional conditions of carbonate-dominated palustrine sedimentation around the K-T boundary (Facies Rognacien, northeastern Pyrenean foreland, southwestern France)
Title: Paleoenvironmental record and applications of calcretes and palustrine carbonates
Author(s): Marty, DanielMeyer, Christian A.
Author(s): Alonso-Zarza, Ana Mariaeditor
Author(s): Tanner, Lawrence H.editor
Affiliation: Office de la Culture OCC, Section d'Archeologie et Paleontologie, Porrentruy, Switzerland
Affiliation: Universidad Complutense de Madrid, Departamento Petrologia y Geoquimica, Madrid, Spain
Pages: 169-187
Published: 2006
Text Language: English
Summary Language: Spanish
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 08137241630
ISBN: 9780813724164
References: 100
Accession Number: 2007-113670
Categories: StratigraphySedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., 1 table, sketch map
N43°00'00" - N44°00'00", E02°00'00" - E03°00'00"
Secondary Affiliation: Le Moyne College, USA, United StatesNaturhistorisches Museum, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200747
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