Inter-layered clay stacks in Jurassic shales

Scanning electron microscopy in the backscattered electron mode is used together with energy-dispersive X-ray microanalysis to show that Lower Jurassic shales from the North Sea Basin contain large numbers of clay mineral stacks up to 150 microns in size. Polished shale sections are examined to dete...

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Bibliographic Details
Published in:Nature (London) 1983-08, Vol.304 (5927), p.618-620
Main Authors: Pye, K., Krinsley, D. H.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics
Humanities and Social Sciences
letter
multidisciplinary
Petrology of sedimentary rocks except quaternary rocks
Science
Science (multidisciplinary)
Sedimentary rocks
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Summary:Scanning electron microscopy in the backscattered electron mode is used together with energy-dispersive X-ray microanalysis to show that Lower Jurassic shales from the North Sea Basin contain large numbers of clay mineral stacks up to 150 microns in size. Polished shale sections are examined to determine the size, shape orientation, textural relationships, and internal compositional variations of the clays. Preliminary evidence that the clay stacks are authigenic, and may have formed at shallow burial depths during early diagenesis, is presented.
ISSN:0028-0836
1476-4687
DOI:10.1038/304618a0