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Dickite related to fluid-sediment interaction and deformation in Pyrenean thrust fault zones

Martine D. Buatier, Anna Trave, Pierre Labaume and Jean Luc Potdevin
Dickite related to fluid-sediment interaction and deformation in Pyrenean thrust fault zones
European Journal of Mineralogy (August 1997) 9 (4): 875-888

Abstract

The syn-sedimentary Lower Eocene deformation of the Ainsa basin, central Pyrenees, resulted in the emplacement of the Cotiella nappe, with thrust faults affecting the Cuisian turbidites. Two of the thrust faults contain a thin shear band of intensely cleaved black marls with calcite veins; kaolinite is the major component of these black marls, the kaolinite polytype being 2M dickite. Texture analysis of the black marls shows millimetric lenses of undeformed silt embedded in strongly deformed illite-dickite-rich sediment; TEM images reveal that the clay minerals are oriented with (001) foliation and that dickite occurs as large (3 mu m) deformed crystals, or as small defect-free crystals generally embedded in illite. Microtextural relationships suggest that dickite is a syn-kinematic mineral precipitated after partial illite dissolution; the K released may have left the system via fluid circulation in the shear zone.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 4
Title: Dickite related to fluid-sediment interaction and deformation in Pyrenean thrust fault zones
Affiliation: Universite Lille I, Laboratoire de Sedimentologie et Geodynamique, Villeneuve d'Ascq, France
Pages: 875-888
Published: 199708
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 1997-070812
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N42°00'00" - N43°00'00", W02°00'00" - E02°00'00"
Secondary Affiliation: CNRS-Universite Montpellier II, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199723
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