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Glauconitization processes in the northwestern Mediterranean (Gulf of Lions)

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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: CHLORITE; GLAUCONITE; GULF OF LIONS; ILLITE; MEDITERRANEAN; NONTRONITE

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855043910120

Publication date: March 1, 2004

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