Diagenetic Mineral Formation in Biogenic Structures (Paleogene, Northeastern Caucasus)

Rare biogenic structures, after which diagenetic minerals are developed, are described from Paleogene rocks of southern Dagestan. It is shown that these minerals form tabular mica-like and colloform aggregates confined to fucoids. In terms of composition, they represent the glauconite group minerals...

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Bibliographic Details
Published in:Lithology and Mineral Resources 2000-12, Vol.35 (6), p.546
Main Authors: Gavrilov, Yu O, Shchepetova, E V
Format: Article
Language:English
Subjects:
Minerals
Paleogene
Rocks
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Summary:Rare biogenic structures, after which diagenetic minerals are developed, are described from Paleogene rocks of southern Dagestan. It is shown that these minerals form tabular mica-like and colloform aggregates confined to fucoids. In terms of composition, they represent the glauconite group minerals. Tabular and colloform minerals are compared with globular glauconite occurring in host sandy rocks. It is demonstrated that the globular variety is characterized by higher K and Fe contents, whereas the tabular variety has a higher SiO^sub 2^ content. The probable mechanism of the formation of tabular and colloform minerals in biogenic structures is discussed.[PUBLICATION ABSTRACT]
ISSN:0024-4902
1573-8892
DOI:10.1023/A:1026697415145