Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Petrology and Geochemistry of the Mount Abu Granites, Southwestern Rajasthan


Affiliations
1 Applied Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi -221 005, India
     

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The Neoproterozoic mount Abu batholith comprises medium to coarse-grained, grey and pink porphyritic to non-porphyritic biotite granites. ChemicalIy and mineralogically, these are sub-aluminous and potash-rich granites. They are characterized by high SiO2, Na2O + K2O, Fe/Mg, Rb, Nb, Zr, Y, Zn, Ga and Th, and low MgO, Fe2Ot3, CaO and Sr contents, and show close affinity to the A-type granites. High K/Rb, Rb/Sr, Ba/Sr and Ga/Al ratios of these granites are suggestive of crustal origin, which were most likely derived by low-degree partial melting of pre-existing depleted lower crustal source. The mount Abu granites were ernplaced at 650'-700°C at an assumed pressure of around 5 kb.

Keywords

Petrology, Geochemistry, A-type granite, Mount Abu granites, Rajasthan.
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  • Petrology and Geochemistry of the Mount Abu Granites, Southwestern Rajasthan

Abstract Views: 203  |  PDF Views: 2

Authors

B. N. Singh
Applied Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi -221 005, India

Abstract


The Neoproterozoic mount Abu batholith comprises medium to coarse-grained, grey and pink porphyritic to non-porphyritic biotite granites. ChemicalIy and mineralogically, these are sub-aluminous and potash-rich granites. They are characterized by high SiO2, Na2O + K2O, Fe/Mg, Rb, Nb, Zr, Y, Zn, Ga and Th, and low MgO, Fe2Ot3, CaO and Sr contents, and show close affinity to the A-type granites. High K/Rb, Rb/Sr, Ba/Sr and Ga/Al ratios of these granites are suggestive of crustal origin, which were most likely derived by low-degree partial melting of pre-existing depleted lower crustal source. The mount Abu granites were ernplaced at 650'-700°C at an assumed pressure of around 5 kb.

Keywords


Petrology, Geochemistry, A-type granite, Mount Abu granites, Rajasthan.