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Pyroxenes of basic rocks and rodingites from an ophiolite mélange, south-eastern Turkey

Published online by Cambridge University Press:  05 July 2018

Robert Hall
Robert Hall*
Affiliation:
Department of Geology, Queen Mary College, London University, London E1 4NS
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Extract

Ophiolitic rocks occur as a tectonic mélange in the Mutki area of the Eastern Taurus Mountains of south-eastern Turkey. They form the upper part of a Tethyan ophiolite-flysch complex, which is thrust southward over sedimentary rocks of the Arabian foreland (Hall, 1976). The tectonic mélange has a matrix of serpentinite and includes blocks of basic volcanics, gabbros, picrites, and rodingites, most of which have suffered metamorphism and metasomatism. The volcanic rocks have been metamorphosed under conditions transitional between the glaucophane-lawsonite schist facies and the greenschist or greenschist-amphibolite transitional facies of Turner (1968). The picrites have escaped any significant metamorphism, while the gabbros have been partially or completely recrystallized under greenschist facies conditions. Both picrites and gabbros have also suffered calcium metasomatism resulting in the alteration of some of the gabbros to rodingites. Pyroxenes from eight separate blocks from the mélange have been analysed by microprobe (fig. 1) to determine if the pyroxene chemistry is consistent with an igneous origin (as suggested by textural evidence) or if there have been changes due to metamorphism and metasomatism.

Type
Synopses
Information
Mineralogical Magazine , Volume 42 , Issue 324 , December 1978 , pp. 511 - 512
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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