Thermal perturbation during charnockitization and granulite facies metamorphism in southern India

Jibamitra Ganguly, R. N. Singh, D. V. Ramana

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The steady-state lithospheric geotherm at c.1 Ga in the south Indian shield area has been deduced using the available data on the concentration of radioactive elements, and the P-T conditions of Proterozoic mantle xenoliths in the south Indian kimberlites as constraints. The geotherm was adjusted back to 2.5 Ga by keeping the surface temperature constant and calculating the temperature change at the top of convecting upper mantle. The reduced or mantle heat flux, which was treated as an adjustable parameter, was 20.9-21.3 mW/m2 at 1-2.5 Ga. Comparison of the calculated steady-state geotherm with the available P-T data of the Archaean (c. 2.5 Ga) charnockites and granulites from southern India suggests that the granulite facies metamorphism in this region had resulted from a major thermal perturbation, which was c.400°C at 25 km. -from Authors

Original languageEnglish (US)
Pages (from-to)419-430
Number of pages12
JournalJournal of Metamorphic Geology
Volume13
Issue number3
StatePublished - 1995

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granulite facies
Radioactive Elements
metamorphism
perturbation
mantle
P-T conditions
heat flux
Heat flux
upper mantle
Archean
shield
Proterozoic
surface temperature
Temperature
temperature
Hot Temperature
comparison
parameter

ASJC Scopus subject areas

  • Geology

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Thermal perturbation during charnockitization and granulite facies metamorphism in southern India. / Ganguly, Jibamitra; Singh, R. N.; Ramana, D. V.

In: Journal of Metamorphic Geology, Vol. 13, No. 3, 1995, p. 419-430.

Research output: Contribution to journalArticle

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AB - The steady-state lithospheric geotherm at c.1 Ga in the south Indian shield area has been deduced using the available data on the concentration of radioactive elements, and the P-T conditions of Proterozoic mantle xenoliths in the south Indian kimberlites as constraints. The geotherm was adjusted back to 2.5 Ga by keeping the surface temperature constant and calculating the temperature change at the top of convecting upper mantle. The reduced or mantle heat flux, which was treated as an adjustable parameter, was 20.9-21.3 mW/m2 at 1-2.5 Ga. Comparison of the calculated steady-state geotherm with the available P-T data of the Archaean (c. 2.5 Ga) charnockites and granulites from southern India suggests that the granulite facies metamorphism in this region had resulted from a major thermal perturbation, which was c.400°C at 25 km. -from Authors

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