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Journal Article

Almandine and spessartine garnets from the giant plagioclase basalts of Deccan Traps, Western Ghats, India

B. V. Oleinikov, A. V. Okrugin, P. Krishnamurthy, R. Murari and K. Gopalan
Current Science
Vol. 65, No. 11 (10 December 1993), pp. 878-880
Stable URL: http://www.jstor.org/stable/24122424
Page Count: 3

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Topics: Garnets, Plagioclase, Basalt, Molecules, Minerals, Liquids, Rocks, Chemical composition, Crystals, Electron probes
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Abstract

Electron microprobe analysis of small (0.3 mm × 0.1 mm) and rare crystals of almandine and spessartine garnets with subordinate amounts of other end member molecules such as pyrope, grossular and andradite is reported for the first time from the giant plagioclase basalts of the Khandala and Jawahar Formations of Deccan Traps from the Western Ghats. A high-pressure magmatic origin has been proposed consistent with the available mineralogy. The highly variable almandine content (41–81%), together with the wide variations noticed in the pyrope (3–40%) molecule, is ascribed to iron enrichment of the host rocks and also to the possible mixing of such evolved compositions with primitive MgO-rich liquids in the magma chamber, with or without possible mirror contamination from lower crustal metamorphic assemblages.

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