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

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The Podili Syenites - A Suite of Alkaline and Subalkaline Rocks from Andhra Pradesh


Affiliations
1 Department of Geology, Osmania University, Hyderabad 500 007, India
2 Central Ground Water Board, Southern Region, Hyderabad, India
     

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The alkali syenites of Podili represent a mildly undersaturated nepheline nonnative microsyenites (NNMS) and quartz nonnative microsyenites (QNMS). All the microsyenites have developed nonnative acmite and are totally free from normative hypersthene. In contrast, the quartz syenites always carry normative hypersthene and are invariably devoid of normative acmite.

In the variation diagrams. the PodiIi syenites form distinct petrochemical trends indicating their consanguineous relationship. A dichotomous differentiation trend is discernible.


Keywords

Alkali Syenite, Alkaline Province, Andhra Pradesh, Geochemistry, Petrology.
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  • The Podili Syenites - A Suite of Alkaline and Subalkaline Rocks from Andhra Pradesh

Abstract Views: 162  |  PDF Views: 2

Authors

V. Madhavan
Department of Geology, Osmania University, Hyderabad 500 007, India
A. G. Sugrive Reddy
Central Ground Water Board, Southern Region, Hyderabad, India

Abstract


The alkali syenites of Podili represent a mildly undersaturated nepheline nonnative microsyenites (NNMS) and quartz nonnative microsyenites (QNMS). All the microsyenites have developed nonnative acmite and are totally free from normative hypersthene. In contrast, the quartz syenites always carry normative hypersthene and are invariably devoid of normative acmite.

In the variation diagrams. the PodiIi syenites form distinct petrochemical trends indicating their consanguineous relationship. A dichotomous differentiation trend is discernible.


Keywords


Alkali Syenite, Alkaline Province, Andhra Pradesh, Geochemistry, Petrology.