Geobarometry, geothermometry, and late Archean geotherms from the granulite facies terrain of South India

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Authors:Harris, N. B. W.; Holt, R. W.; Drury, S. A.
Author Affiliations:Primary:
Open Univ., Dep. Earth Sci., Milton Keynes, United Kingdom
Volume Title:Journal of Geology
Source:Journal of Geology, 90(5), p.509-527. Publisher: University of Chicago Press, Chicago, IL, United States. ISSN: 0022-1376
Publication Date:1982
Note:In English. 50 refs.; illus. incl. 13 anal., 8 tables, geol. sketch map
Summary:Deduced P-T relations of garnet-bearing charnockitic and metapelitic assemblages from the high-grade terrain of South India indicate three fields of equilibration. The high-P granulites suggest a minimum of approx 30 km as the maximum thickness of the late Archaean crust in this region. These granulites as well as the medium- and low-P granulites lie on a metamorphic geotherm the shape of which is characteristic of convective heat transfer. The P-T conditions in the high-grade terrain are consistent with metamorphism induced by a CO2-rich vapour phase originating in the mantle. [I.M.S.]
Subjects:Archean; Charnockite; Chemical composition; Crust; Facies; Geochemistry; Geologic barometry; Geologic thermometry; Granites; Granulite facies; Granulites; High-grade metamorphism; Igneous rocks; Metamorphic rocks; Metamorphism; Metapelite; Metasedimentary rocks; Mineral assemblages; Neoarchean; P-T conditions; Petrology; Phase equilibria; Plutonic rocks; Precambrian; Asia; India; Indian Peninsula
Coordinates:N080000 N130000 E0800000 E0750000
Abstract Numbers:87M/3537
Record ID:1983010973
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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