The Ghingee Granite, Tamil Nadu, South India: Geochemistry and Petrogenesis |
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Authors: | V Divakara Rao P Rama Rao MV Subba Rao |
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Institution: | aNational Geophysical Research Institute, Hyderabad - 500 007, India |
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Abstract: | The Palaeo-Proterozoic Ghingee granite is an anatectic granite formed in high grade granulite terrain by ultrametamorphism. The compositional variations both in major and trace elements observed in this granite (SiO2 : 64.16-73.81; Fe2O3 : 0.12-2.19; FeO : 0.12-2.80; MgO : 0.10-2.19; CaO : 1.66-4.71; K2O : 1.09-5.09; Ba: 223-1883 ppm; Cr : 4-60 ppm) are attributed to a) source rock heterogeneity and b) the tectonic disturbances that might have abruptly ended the anatectic melting process. The granite is compositionally similar to Perur, Closepet and Hyderabad granites and is formed during Archaean-Proterozoic transition by anatectic and crustal remelting processes. |
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Keywords: | Granite Precambrian geochemistry Tamil Nadu India |
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