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Three zones for illite formation during burial diagenesis and metamorphism

Clays and Clay Minerals

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Abstract

Reinterpretation of published data for shale cuttings from the Gulf of Mexico sedimentary basin identifies three reaction zones for illite formation with increasing depth for well CWRU6. In a shallow zone (1.85 to 3 km), non-expanding illite-like layers formed primarily by the coalescence of smectite 2:1 layers around interlayer K+. In a middle zone (3 to 4 km), illite crystals neoformed from solution as coarser K-bearing phases and smectite were dissolved by organic acids. In the deepest zone (>4 km), illite recrystallized as less stable illite crystals dissolved, and more stable illite crystals grew during mineral ripening. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Three zones for illite formation during burial diagenesis and metamorphism
Series title:
Clays and Clay Minerals
Volume
41
Issue:
1
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
26
Last page:
37
Number of Pages:
12