Exhumation history of eclogites from the Tso-Morari crystalline complex in eastern Ladakh; mineralogical and fluid inclusion constraints

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Authors:Sachan, H. K.; Bodnar, Robert J.; Islam, R.; Szabo, C.; Law, R. D.
Author Affiliations:Primary:
Wadia Institute of Himalayan Geology, Dehra Dun, India
Other:
Virginia Polytechnic Institute and State University, United States
Volume Title:Journal of the Geological Society of India
Source:Journal of the Geological Society of India, 53(2), p.181-190. Publisher: Geological Society of India, Bangalore, India. ISSN: 0016-7622
Publication Date:1999
Note:In English. 44 refs.; illus., incl. geol. sketch maps
Summary:Eclogites from the Tso-Morari Crystalline Complex in Ladakh, India, preserve evidence for high P, low T metamorphism of subducted Indian continental crust in the presence of a moderate salinity aqueous fluid phase. The phengite barometry estimates a pressure range of 11-14 kbar for eclogitization whereas garnet-omphacite geothermometry reveals a temperature range of 530°-580°C. Following eclogitization at 530°-580°C at a minimum pressure of 14 kbar, the eclogites were tectonically exhumed along a nearly isothermal P-T path that brought them to within 10-30 kilometers of the surface. Final transport to the surface followed a more normal continental geotherm.
Sections:Petrology
Subsections:Metamorphism: regional, dynamic
Subjects:Chain silicates; Clinopyroxene; Eclogite; Exhumation; Fluid inclusions; Geologic barometry; Geologic thermometry; High pressure; High temperature; Inclusions; Metamorphic rocks; Metamorphism; Mineral composition; Omphacite; Petrography; Phase equilibria; Pressure; Pyroxene group; Silicates; Temperature; Asia; India; Indian Peninsula; Jammu and Kashmir; Ladakh; Tso-Morari Complex
Coordinates:N270000 N370000 E0970000 E0720000
Abstract Numbers:99M/3313
Record ID:1999049431
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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