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GEOREF RECORD

Chlorite and illite in some lower Palaeozoic mudstones of Mid-Wales

L. J. Evans and W. A. Adams
Chlorite and illite in some lower Palaeozoic mudstones of Mid-Wales
Clay Minerals (July 1975) 10 (5): 387-397

Abstract

Lower Palaeozoic mudstones from Cwmcadian, Gwynedd are dominantly composed of quartz, illite and chlorite, with subordinate albite, orthoclase and rutile. Chemical formulae are determined for chlorite and illite using a combination of chemical and X-ray data. The formulae indicate that the illite is dioctahedral and suggest that the chlorite structure contains one dioctahedral and one trioctahedral layer. The hypothesis is put forward that both minerals formed from a dioctahedral mineral; illite from a non-expanded form and chlorite from an 'open' form by precipitation of a Fe (super 2+) /Mg hydroxide interlayer.


ISSN: 0009-8558
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 10
Serial Issue: 5
Title: Chlorite and illite in some lower Palaeozoic mudstones of Mid-Wales
Pages: 387-397
Published: 197507
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
Accession Number: 1976-010098
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. tables
N51°30'00" - N53°30'00", W05°15'00" - W02°40'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 1976
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