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An ancient depleted mantle source for Archean crust in Rajasthan, IndiaData from an initial set of Banded Gneiss Complex (BGC) east of the city of Udaipur are given. In this region the BGC comprises typical grey gneiss with variably abundant granitic and mafic components. Efforts to date were concentrated on the mafic components which, based on chemical data, appear to be metavolcanic. All samples examined were recrystallized under amphibolite or upper amphibolite facies conditions. Pertinent chemical data for a small number of amphibolites analyzed so far are: SiO2: 49-53%; MgO: 5.7-7.3%; K2O: 0.24-0.50%; Ni: 106-140 ppm; Zr: 37-159 ppm. From Sm/Nd data, all amphibolites show small to moderate LREE enrichments.
Document ID
19840012889
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Macdougall, J. D. (Scripps Institution of Oceanography La Jolla, CA, United States)
Gopalan, K. (Physical Research Lab. Ahmedabad, India)
Lugmair, G. W. (Scripps Institution of Oceanography La Jolla, CA, United States)
Roy, A. B. (Rajasthan Univ.)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust
Subject Category
Geophysics
Accession Number
84N20957
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19840012879Collected WorksWorkshop on a Cross Section of Archean Crust
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