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An ancient depleted mantle source for Archean crust in Rajasthan, India (1983)

Gopalan, K. ; Lugmair, G. W. ; Macdougall, J. D. ; [et al.]

In: CASI

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Publication Date: 2016-06-07

Description: Data 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.

Keywords: GEOPHYSICS

Type: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust; p 55-56

Format: application/pdf

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