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Jenner, G.A., Longerich, H.P., Jackson, S.E. and Fryer, B. J. (1990) ICP-MS a powerfull tool for high-precision trace element analysis in earth science: Evidence from analysis of selected USGS reference samples, Chemical Geology, 83, 133-148.

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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).