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Significance of ultrahigh-P talc-bearing eclogitic assemblages

J. G. Liou and R. Y. Zhang
Significance of ultrahigh-P talc-bearing eclogitic assemblages
Mineralogical Magazine (March 1995) 59 (1): 93-102

Abstract

Talc was identified as an equilibrium associate of omphacite, kyanite, zoisite, and garnet in some coesitebearing eclogites and as a retrograde phase in associated garnet peridotite from the Bixiling mafic-ultramafic complex in the Dabie ultrahigh-P metamorphic terrane, central China. Observed talc- and tremolite-bearing assemblages within the coexisting mafic and ultramafic rocks together with established phase relations for the simple system CaO-MgO-Al (sub 2) O (sub 3) -SiO (sub 2) -H (sub 2) O constrain the P-T path for retrograde metamorphism. This, together with reported talc occurrences from the Dora Maira massif, leads to the conclusion that UHP talc assemblages are confined to mafic and pelitic rocks of unusual chemistry, and are not stable at ultrahigh pressures in ultramafic rocks. Thus, talc cannot be an important H (sub 2) O-bearing phase in deep mantle ultramafic rocks.


ISSN: 0026-461X
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 59
Serial Issue: 1
Title: Significance of ultrahigh-P talc-bearing eclogitic assemblages
Affiliation: Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States
Pages: 93-102
Published: 199503
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 25
Accession Number: 1995-049858
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 199518
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