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Petrochemistry of Basics and Metabasics, Mandi-Pandoh Area, Himachal Pradesh, India
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Basic and metabasic rocks occur in the form of an oval-shaped, plug-like body. intrusive into the granitic gneisses and metasediments belonging to the Chail Formation. The core is made of fresh olivine gabbro metamorphosed to varying degrees at the margins. Chemical data suggest that the basic and metabasic rocks are co-magmatic and the parent magma was of alkali olivine basalt composition. The observed diversity in physical and textural parameters exhibited by different rocks are considered to be the expressions of varying rates of cooling and effects of autometamorphism. These are more pronounced at the margins than in the central parts of the body.
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