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Glauconitization processes in the northwestern Mediterranean (Gulf of Lions)

Published online by Cambridge University Press:  09 July 2018

P. Giresse ,
A. Wiewióra  and
D. Grabska
P. Giresse
Affiliation:
Laboratoire d'Étude des Géo-Environnements Marins, Université de Perpignan, 52, Av. Paul Alduy, 66860, PerpignanFrance
A. Wiewióra*
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818, WarsawPoland
D. Grabska
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818, WarsawPoland
*
E-mail: wiewiora@twarda.pan.pl
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Abstract

Two sedimentary profiles, at 18 km and at 125 km from the Rhône River mouth were selected to study the steps of glauconitization inside green (glaucony) grains, in a temperate marine environment. The proximal site is characterized by a greater content of alpine minerals (chlorite, illite) than the distal one. In the proximal site, pellets at a younger level demonstrate a largely inherited mineral composition. In the older level, representing the most advanced stage of glauconitization, there is a mixed-layer glauconite-nontronite (G-N) phase with 20% glauconite-80% nontronite in dark green grains. In the distal site, more evolved glaucony has up to 92% glauconite in the G-N. In spite of this difference, the glauconitization process developed similarly in the two sites. The relatively low Fe content in the mud-matrix does not reflect the concentration of this element inside the grains. During diagenesis, most of the inherited minerals disappear, making way for neoformed mixed-layer glauconite-nontronite.

Keywords

glauconitenontronitechloriteilliteMediterraneanGulf of Lions
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 1 , March 2004 , pp. 57 - 73
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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