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

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Analcite from the Neoproterozoic Peralkaline Dykes of Southern Karnataka


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

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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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  • Analcite from the Neoproterozoic Peralkaline Dykes of Southern Karnataka

Abstract Views: 212  |  PDF Views: 147

Authors

T. C. Devaraju
Department of Studies in Geology, Karnatak University, Dharwad - 580 003, India
K. Laajoki
Institute of Geosciences and Astronomy, Department of Geology, University of Oulu, Linnanmaa, SF-90570, Finland
H. Makkonen
Institute of Geosciences and Astronomy, Department of Geology, University of Oulu, Linnanmaa, SF-90570, Finland

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.