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

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Significance of Fayalite (+Quartz) Assemblage in Gokanakonda Syenite, Prakasam District, Andhra Pradesh


Affiliations
1 Department of Geology, Osmania University, Hyderabad 500 007, India
2 National Geophysical Research Institute, Uppal, Hyderabad 500 039, India
     

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The Fayalite syenites of Gokanakonda in Andhra Pradesh, India, are mineralogically divided into two types: (1) fayalite-clinopyroxene syenites (FC-syenites) and (2) fayalite-quartz syenites (FQ-syenites). The olivine composition ranges from Fa90-95 and the petrochemistry suggests their successive evolution in that order. The assemblage (fayalite+magnetite+quartz) in these syenites suggests a pressure of 11.5 kb and a temperature of 900°C under constant fo2.

Keywords

Petrology (Igneous), Fayalite-Syenite, Prakasarn District, Andhra Pradesh.
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  • Significance of Fayalite (+Quartz) Assemblage in Gokanakonda Syenite, Prakasam District, Andhra Pradesh

Abstract Views: 178  |  PDF Views: 4

Authors

T. P. Srinivasan
Department of Geology, Osmania University, Hyderabad 500 007, India
R. Natarajan
National Geophysical Research Institute, Uppal, Hyderabad 500 039, India

Abstract


The Fayalite syenites of Gokanakonda in Andhra Pradesh, India, are mineralogically divided into two types: (1) fayalite-clinopyroxene syenites (FC-syenites) and (2) fayalite-quartz syenites (FQ-syenites). The olivine composition ranges from Fa90-95 and the petrochemistry suggests their successive evolution in that order. The assemblage (fayalite+magnetite+quartz) in these syenites suggests a pressure of 11.5 kb and a temperature of 900°C under constant fo2.

Keywords


Petrology (Igneous), Fayalite-Syenite, Prakasarn District, Andhra Pradesh.