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Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad 500007, IN
2 Atornic Minerals Division, Hyderabad-500016, IN
3 Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow-117075, RU
4 Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow-117075, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 6 (1993), Pagination: 509-512
Abstract
Electron probe microanalysis (EPMA) and preliminary x- ray diffraction studies on a basalt flow from Mt.Sundook have revealed the presence of rare high-alumina hypersthene in the groundmass. The basalt occurs at the base of a 800 m flow sequence (Ivakinsky and Syverminsky suite) that unconformably overlies a Permo-Carboniferous sedimentary sequences. It is postulated that besides normal processes of fractionation, assimilation-fractional Crystallization (AFC) processes involving the parental magma and crustal components (pelitic sedinientary rocks) were responsible for the formation of hypersthene in the basalt. The presence of a complex feldspar and pyroxene assemblage may also be an additional evidence for the operation of such an AFC process.
Keywords
High-Alumina Hypersthene, Basalt, Siberian Traps, Mt. Sundook, Russia.
