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

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Geochemistry of Anorthositic Dyke from Nuggihalu Schist Belt of Dharwar Craton, Karnataka, India


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1 National Geophysical Research Institute, Hyderabad 500007, India
     

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Geochemical data is presented of an anorthosite dyke from Nuggihalli made of calcic plagioclase (An70-80), amphibole, pyroxene and accessories like magnetite, sphene and apatite. The chemical data shows high Mg/Mg+Fe++ ratio (Avg.=0.48) and CaO/Na2O ratio (Avg.=8.70) with, <5 ppm Rb and 56-90 ppm Sr., indicating a substantial fractionation of ferromagnesium phase from a highly calcic ultrabasic parent magma.
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  • Geochemistry of Anorthositic Dyke from Nuggihalu Schist Belt of Dharwar Craton, Karnataka, India

Abstract Views: 152  |  PDF Views: 3

Authors

S. H. Jafri
National Geophysical Research Institute, Hyderabad 500007, India
Ramavati Saxena
National Geophysical Research Institute, Hyderabad 500007, India

Abstract


Geochemical data is presented of an anorthosite dyke from Nuggihalli made of calcic plagioclase (An70-80), amphibole, pyroxene and accessories like magnetite, sphene and apatite. The chemical data shows high Mg/Mg+Fe++ ratio (Avg.=0.48) and CaO/Na2O ratio (Avg.=8.70) with, <5 ppm Rb and 56-90 ppm Sr., indicating a substantial fractionation of ferromagnesium phase from a highly calcic ultrabasic parent magma.