Ultra-high temperature metamorphism of metapelitic granulites from Kondapalle, Eastern Ghats Belt: implications for the Indo-Antarctic correlation
A suite of quartz- and corundum-bearing metapelitic granulites, metamorphism occurred in the lower crust (>8 kbar). Reported intruded by layered gabbronorite–pyroxenite–anorthosite at Kon- U–Pb cooling ages of monazite and allanite from a late pegmatite dapalle, Eastern Ghats Belt, preserves a mu...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.538.9008 http://petrology.oxfordjournals.org/content/40/7/1065.full.pdf |
| Summary: | A suite of quartz- and corundum-bearing metapelitic granulites, metamorphism occurred in the lower crust (>8 kbar). Reported intruded by layered gabbronorite–pyroxenite–anorthosite at Kon- U–Pb cooling ages of monazite and allanite from a late pegmatite dapalle, Eastern Ghats Belt, preserves a multitude of reaction suggest the UHT metamorphism to be older than 1600 Ma. The textures involving oxide and silicate minerals that attest to several deduced P–T history and the absence of Grenvillian high-grade prograde and retrograde reactions. In the quartz-bearing associations, metamorphism in the study area provide important constraints on the reactions are: (a) biotite + sillimanite + quartz fi garnet the configuration of East Gondwana, in particular on the continuation + liquid; (b) garnet + sillimanite fi spinel (+ magnetite) + of the Napier–Rayner terrane boundary into the Eastern Ghats quartz; (c) Fe2TiO4 + O2 fi ferrian ilmenite + magnetite; (d) Belt. reversal of reaction (b); (e) Fe2O3-rich ilmenite + plagioclase + quartz fi Fe2O3-poor ilmenite + garnet + O2. Reactions in the corundum-bearing associations are: (f) spinel + biotite + sil-limanite fi garnet + liquid; (g) biotite + sillimanite fi garnet + Ti-rich spinel+ corundum+ liquid; (h) biotite+ sillimanite KEY WORDS: metapelitic granulites; UHT metamorphism; Eastern Ghats fi garnet + corundum + liquid; (i) Fe2TiO4 + FeAl2O4 + Belt, India; Indo-Antarctic terrane assembly O2 fi ferrian ilmenite+ Fe3O4 + Al2O3 (in ilmenite); (j) garnet |
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