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

S. Gehar ¹, K. Laajoki ¹, T. C. Devaraju ²

Affiliations
1 Dept. of Geology, University of Oulu, FI
2 Dept. of Studies in Geology, Karnatak University, Dharwad-580 003, IN

Abstract

No Abstract.

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T. C. Devaraju ¹, T. A. Halkoaho ², K. Laajoki ², M. Shreerama ¹, G. Subbarao ¹

Affiliations
1 Depaftment of Studies in Geology, Karnataka University, Dharwad - 580 003, IN
2 Department of Geosciences and Astronomy, University of Oulu, Linnanmaa, SF 90570, Oulu, FI

Abstract

Electron Microprobe studies on BIF from Kudremukh area have indicated the presence of Ag-Bi- and Pb-Tellurides in association with other sulphides

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T. C. Devaraju ¹, K. Laajoki ², H. Makkonen ²

Affiliations
1 Department of Studies in Geology, Karnatak University, Dharwad - 580 003, IN
2 Institute of Geosciences and Astronomy, Department of Geology, University of Oulu, Linnanmaa, SF-90570, FI

Abstract

Analcite with the chemical formula close to Na₁₅Al₁₆Si₃₂O₉₆ occurs as one of the important groundmass minerals of some of the peralkaline Neoproterozoic dykes in Southern Karnataka. Observations suggest its formation upon emplacement, at low temperature, from a soda-enriched and silica deficient residual melt, after intratelluric preemplacement crystallization of K-feldspar and alkali pyroxene phenocrysts.

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