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GEOREF RECORD

A coesite inclusion in dolomite in Dabie Shan, China; petrological and rheological significance

Hans-Peter Schertl and Aral I. Okay
A coesite inclusion in dolomite in Dabie Shan, China; petrological and rheological significance
European Journal of Mineralogy (December 1994) 6 (6): 995-1000

Abstract

Coesite partially inverted to quartz occurs as an inclusion in dolomite in a calc-silicate rock in Dabie Shan, central China. The calc-silicate rock consists mainly of dolomite, calcite, quartz and phengite that is partially replaced by phlogopite, plagioclase and secondary phengite. This calc-silicate rock is intercalated with marble forming a band >> 8 m thick in felsic gneiss; it contains Ca-rich eclogite blocks with coesite and diamond inclusions in both pyroxene and garnet. Radial cracks are absent surrounding the coesite/quartz inclusion, suggesting that the increase in volume associated with the coesite-quartz inversion was largely accommodated by movement along the cleavage planes. The presence of coesite within dolomite in calc-silicate rocks confirms that sedimentary rocks deposited on continental crust can be subducted to depths of >> 100 km, and that even a carbonate mineral like dolomite is able to preserve coesite during the process of eduction.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 6
Title: A coesite inclusion in dolomite in Dabie Shan, China; petrological and rheological significance
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Minerologie, Bochum, Federal Republic of Germany
Pages: 995-1000
Published: 199412
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 22
Accession Number: 1995-007449
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table
N30°00'00" - N32°00'00", E114°00'00" - E117°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199503
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