Geochemical characteristics and possible origins of the southern Closepet batholith, South India

P. Allen, K. Condie, G. P. Bowling

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The polyphase Closepet batholith in S India intrudes Archean tonalitic and granitic gneisses in a terrane that grades from amphibolite to granulite grade at the S end of the batholith. Two granite and 2 granodioritic suites are recognized in the batholith. One granite suite from the S terminus of the batholith has high Sr, Ba, La/Yb, and Eu/Eu*, and low Sc, Y, Nb, Ta, and total REE and is similar to other granites from along the amphibolite-granulite transition zone that have the characteristics of a fractionally crystallized cumulate. The other granite suite has lower Sr and Ba, higher Sc and Y, and no distinctice Eu anomaly. This latter group, which is widespread in the S Closepet batholith, can be derived by 20% equilibrium partial melting of a tonalite source (containing hornblende and garnet) that is compositionally similar to S India tonalites near the amphibolite-granulite transition. The 2 granite groups may have been produced by separate episodes of CO2 metamorphism. the granodiorites appear to have formed by mixing, in different proportions, of tonalitic and granitic gneisses, within and around the SE margin of the batholith. -Author

Original languageEnglish
Pages (from-to)283-299
Number of pages17
JournalJournal of Geology
Volume94
Issue number2
Publication statusPublished - 1986
Externally publishedYes

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