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

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Electron Microprobe Dating of Monazite from Spinel Granulite in the Eastern Ghats Belt, India


Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530 003, India
2 Institute of Experimental Mineralogy, 1142432, Chernogolovka, Moscow District, Russian Federation
     

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Electron microprobe dating method is same as chemical aging method of U-Th minerals used in geochronology. The Th-U-Pb concentrations obtained from a single electron probe analysis allow calculation of geologically meaningful age. Based on this method monazite from spinel granulite of Visakhapatnam in the Eastern Ghats Belt (EGB) gave ∼1,000 Ma, corroborating the late Proterozoic metamorphism and charnockite emplacement, established in parts of the EGB and Antarctica. Microgeochronology of commonly occurring accessory mineral such as monazite in granulite variants is recommended for quick reconnaissance correlation in Gondwanian fragments in East Gondwanaland.

Keywords

Micro-Geochronology, Electron Microprobe Dating, Monazite, Eastern Ghats Belt, A. P.
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  • Electron Microprobe Dating of Monazite from Spinel Granulite in the Eastern Ghats Belt, India

Abstract Views: 153  |  PDF Views: 3

Authors

A. T. Rao
Department of Geology, Andhra University, Visakhapatnam-530 003, India
V. I. Fonarev
Institute of Experimental Mineralogy, 1142432, Chernogolovka, Moscow District, Russian Federation
A. N. Konilov
Institute of Experimental Mineralogy, 1142432, Chernogolovka, Moscow District, Russian Federation
M. Romanenko
Institute of Experimental Mineralogy, 1142432, Chernogolovka, Moscow District, Russian Federation

Abstract


Electron microprobe dating method is same as chemical aging method of U-Th minerals used in geochronology. The Th-U-Pb concentrations obtained from a single electron probe analysis allow calculation of geologically meaningful age. Based on this method monazite from spinel granulite of Visakhapatnam in the Eastern Ghats Belt (EGB) gave ∼1,000 Ma, corroborating the late Proterozoic metamorphism and charnockite emplacement, established in parts of the EGB and Antarctica. Microgeochronology of commonly occurring accessory mineral such as monazite in granulite variants is recommended for quick reconnaissance correlation in Gondwanian fragments in East Gondwanaland.

Keywords


Micro-Geochronology, Electron Microprobe Dating, Monazite, Eastern Ghats Belt, A. P.