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

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DOI: 10.4236/ns.2010.210135    5,017 Downloads   9,092 Views   Citations


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).

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Kar, R. and Bhattacharya, S. (2010) New experimental constraints: implications for pe-trogenesis of charnockite of dioritic composition. Natural Science, 2, 1085-1089. doi: 10.4236/ns.2010.210135.


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