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Petrology and Geochemistry of Anorthosite, Jiwan Singh Ki Beri, Barmer District, Rajasthan
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Anorthosite occurs as a discontinuous ENE-WSW trending lensoidal (300 m x 1500 m) discordant body within biotite granite and gneisses of pre-Malani age and lies to the SSW of the intersection of the Jaisalmer-Barwani and Lathi-Rajkot lineaments. It is a coarse-grained greenish grey rock with no banding or mineral lineation. It comprises of 92% plagioclase (An 70-78) and 7% hornblende. It is characterised by low SiO2, K2O, Ba and Rb and high Sr and has normative olivine, nepheline and corundum.
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