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Tarney, J., Wyborn, L.E.A., Sheraton, J.W. and Wyborn, D. (1987) Trace element differences between Archaean, proterozoic and phanerozoic crustal components: Implications for crustal growth processes. In: Ashwal, L.D. Ed., Workshop on the growth of continental crust, Lunar and Planetary Institute, 139-140.

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• TITLE: New experimental constraints: implications for pe-trogenesis of charnockite of dioritic composition

  AUTHORS: Rajib Kar, Samarendra Bhattacharya

  KEYWORDS: Dioritic charnockite; Residual clinopyroxene; Residual plagioclase; Eutectic melting

  JOURNAL NAME: Natural Science, Vol.2 No.10, October 29, 2010

  ABSTRACT: Hornblende-dehydration melting experiments at high temperatures (> 950oC) indicate change of melt composition from tonalite/granodiorite to quartz-diorite; clinopyroxene instead of hornbl- ende as the residual phase and change in melting reaction from peritectic hornblende-dehydr- ation to eutectic clinopyroxene-orthopyroxene- plagioclase. In the light of these experimental results, petrogenesis of a charnockite pluton of homogeneous dioritic composition in the Eastern Ghats Belt, India, can be explained as melting at high-temperatures (> 950oC). Negative Sr and Eu anomalies further indicate plagioclase as a major residual phase, consistent with melt- ing at high-temperatures (> 950oC).