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Glaucophane-bearing eclogites in the Tso Morari Dome (eastern Ladakh, NW Himalaya)

Julia de Sigoyer, Stephane Guillot, Jean-Marc Lardeaux and Georges Mascle
Glaucophane-bearing eclogites in the Tso Morari Dome (eastern Ladakh, NW Himalaya)
European Journal of Mineralogy (October 1997) 9 (5): 1073-1083


Lenses of glaucophane-bearing eclogites occur in the Cambro-Ordovician metagranitic basement and in the Permian metasedimentary cover of the Tso Morari dome, E Ladakh [Pakistan]. Petrological and thermobarometric evidence shows that these rocks underwent a high-P event (P >><$I> 16, probably approximately 20 + or - 3 kbar) associated with relatively low T (580 + or - 60 degrees C). The start of decompression was isothermal down to 11 + or - 2 kbar; subsequently, T increased to 610 + or - 70 degrees C in amphibolite-facies conditions. EPMA results are reported for garnet, amphibole, clinopyroxene, phengite, paragonite and albite. This record of high-P and relatively low-T metamorphism in the Himalayan belt implies that an early subduction of the whole NW part of the Indian continental margin to a minimum depth of 70 + or - 10 km occurred during the India-Asia convergence. Two successive orogenic units can be distinguished: 1) the N Himalayan massif related to the continental subduction, and 2) the High Himalayan crystalline slab related to the intracontinental subduction.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 5
Title: Glaucophane-bearing eclogites in the Tso Morari Dome (eastern Ladakh, NW Himalaya)
Affiliation: CNRS-UMR 55-70, Laboratoire de Petrologie et Tectonique, Villeurbanne, France
Pages: 1073-1083
Published: 199710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 43
Accession Number: 1997-077054
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
N30°00'00" - N34°00'00", E70°00'00" - E80°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: 199724
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