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GEOREF RECORD

Clay minerals in Upper Permian evaporites from the Northern Calcareous Alps (Alpine Haselgebirge Formation, Austria)

Christoph Spoetl
Clay minerals in Upper Permian evaporites from the Northern Calcareous Alps (Alpine Haselgebirge Formation, Austria)
European Journal of Mineralogy (December 1992) 4 (6): 1407-1419

Abstract

The clay mineral assemblage in argillaceous halites, mudrocks and sandstones from this formation consist of dioctahedral illite and triochtahedral Mg-chlorite (clinochlore) plus varying traces of quartz, alkali feldspar and magnesite. The illite contains < 5% smectite and is predominantly of the IMd/IM polytype with 20% 2M (sub 1) component; the chlorite is also non-expandable and belongs to the IIb polytype. Illites from the halites have the lowest 'illite crystallinity' (mean 0.42 +- 0.02 DELTA 2theta), implying an incipient anchizonal overprint; values from mudrocks (0.47 +- 0.01) and sandstones (0.56 +- 0.03) are significantly higher and indicate high-grade diagenesis rather than anchimetamorphism. The low illite crystallinity values of illites from halite samples may reflect the availability of K in these evaporites.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 6
Title: Clay minerals in Upper Permian evaporites from the Northern Calcareous Alps (Alpine Haselgebirge Formation, Austria)
Author(s): Spoetl, Christoph
Affiliation: University of Missouri-Columbia, Department of Geological Sciences, Columbia, MO, United States
Pages: 1407-1419
Published: 199212
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 47
Accession Number: 1995-056259
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N46°15'00" - N49°00'00", E09°30'00" - E17°15'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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