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, intruded by layered gabbronorite–pyroxenite–anorthosite at Kondapalle, Eastern Ghats Belt, preserves a multitude of reaction textures involving oxide and silicate minerals that attest to several prograde and retrograde reactions. In the...
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fthighwire:oai:open-archive.highwire.org:petrology:40/7/1065 2023-05-15T14:05:03+02:00 Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation Sengupta, P. Sen, J. Dasgupta, S. Raith, M. Bhui, U. K. Ehl, J. 1999-07-01 00:00:00.0 text/html http://petrology.oxfordjournals.org/cgi/content/short/40/7/1065 https://doi.org/10.1093/petroj/40.7.1065 en eng Oxford University Press http://petrology.oxfordjournals.org/cgi/content/short/40/7/1065 http://dx.doi.org/10.1093/petroj/40.7.1065 Copyright (C) 1999, Oxford University Press Articles TEXT 1999 fthighwire https://doi.org/10.1093/petroj/40.7.1065 2013-05-27T17:29:18Z A suite of quartz- and corundum-bearing metapelitic granulites, intruded by layered gabbronorite–pyroxenite–anorthosite at Kondapalle, Eastern Ghats Belt, preserves a multitude of reaction textures involving oxide and silicate minerals that attest to several prograde and retrograde reactions. In the quartz-bearing associations, the reactions are: (a) biotite + sillimanite + quartz → garnet + liquid; (b) garnet + sillimanite → spinel (+ magnetite) + quartz; (c) Fe 2 TiO 4 + O 2 → ferrian ilmenite + magnetite; (d) reversal of reaction (b); (e) Fe 2 O 3 -rich ilmenite + plagioclase + quartz → Fe 2 O 3 -poor ilmenite + garnet + O 2 . Reactions in the corundum-bearing associations are: (f) spinel + biotite + sillimanite → garnet + liquid; (g) biotite + sillimanite → garnet + Ti-rich spinel + corundum + liquid; (h) biotite + sillimanite → garnet + corundum + liquid; (i) Fe 2 TiO 4 + FeAl 2 O 4 + O 2 → ferrian ilmenite + Fe 3 O 4 + Al 2 O 3 (in ilmenite); (j) garnet + corundum → spinel + sillimanite. To examine the paragenetic evolution of the metapelitic granulites, a petrogenetic grid for the KFMASH system at high temperatures and pressures, involving quartz and corundum, was constructed. The sequence of inferred reactions documents an anticlockwise heating–cooling path. Reintegrated compositions of spinel (with >10 mol % Fe 2 TiO 4 ) and feldspars indicate ultra-high temperature (UHT) of metamorphism (>1000°C), comparable with the liquidus temperature of the enclosing magmatic rocks. Crystallization pressures inferred for the magmatic rocks and the pressure constraints imposed by the petrogenetic grid on the metapelite assemblages indicate that the emplacement of the igneous suite and the accompanying UHT metamorphism occurred in the lower crust (>8 kbar). Reported U–Pb cooling ages of monazite and allanite from a late pegmatite suggest the UHT metamorphism to be older than 1600 Ma. The deduced P – T history and the absence of Grenvillian high-grade metamorphism in the study area provide important ... Text Antarc* Antarctic HighWire Press (Stanford University) Antarctic Journal of Petrology 40 7 1065 1087 |
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Articles Sengupta, P. Sen, J. Dasgupta, S. Raith, M. Bhui, U. K. Ehl, J. Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
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Articles |
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A suite of quartz- and corundum-bearing metapelitic granulites, intruded by layered gabbronorite–pyroxenite–anorthosite at Kondapalle, Eastern Ghats Belt, preserves a multitude of reaction textures involving oxide and silicate minerals that attest to several prograde and retrograde reactions. In the quartz-bearing associations, the reactions are: (a) biotite + sillimanite + quartz → garnet + liquid; (b) garnet + sillimanite → spinel (+ magnetite) + quartz; (c) Fe 2 TiO 4 + O 2 → ferrian ilmenite + magnetite; (d) reversal of reaction (b); (e) Fe 2 O 3 -rich ilmenite + plagioclase + quartz → Fe 2 O 3 -poor ilmenite + garnet + O 2 . Reactions in the corundum-bearing associations are: (f) spinel + biotite + sillimanite → garnet + liquid; (g) biotite + sillimanite → garnet + Ti-rich spinel + corundum + liquid; (h) biotite + sillimanite → garnet + corundum + liquid; (i) Fe 2 TiO 4 + FeAl 2 O 4 + O 2 → ferrian ilmenite + Fe 3 O 4 + Al 2 O 3 (in ilmenite); (j) garnet + corundum → spinel + sillimanite. To examine the paragenetic evolution of the metapelitic granulites, a petrogenetic grid for the KFMASH system at high temperatures and pressures, involving quartz and corundum, was constructed. The sequence of inferred reactions documents an anticlockwise heating–cooling path. Reintegrated compositions of spinel (with >10 mol % Fe 2 TiO 4 ) and feldspars indicate ultra-high temperature (UHT) of metamorphism (>1000°C), comparable with the liquidus temperature of the enclosing magmatic rocks. Crystallization pressures inferred for the magmatic rocks and the pressure constraints imposed by the petrogenetic grid on the metapelite assemblages indicate that the emplacement of the igneous suite and the accompanying UHT metamorphism occurred in the lower crust (>8 kbar). Reported U–Pb cooling ages of monazite and allanite from a late pegmatite suggest the UHT metamorphism to be older than 1600 Ma. The deduced P – T history and the absence of Grenvillian high-grade metamorphism in the study area provide important ... |
format |
Text |
author |
Sengupta, P. Sen, J. Dasgupta, S. Raith, M. Bhui, U. K. Ehl, J. |
author_facet |
Sengupta, P. Sen, J. Dasgupta, S. Raith, M. Bhui, U. K. Ehl, J. |
author_sort |
Sengupta, P. |
title |
Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
title_short |
Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
title_full |
Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
title_fullStr |
Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
title_full_unstemmed |
Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation |
title_sort |
ultra-high temperature metamorphism of metapelitic granulites from kondapalle, eastern ghats belt: implications for the indo-antarctic correlation |
publisher |
Oxford University Press |
publishDate |
1999 |
url |
http://petrology.oxfordjournals.org/cgi/content/short/40/7/1065 https://doi.org/10.1093/petroj/40.7.1065 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
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Antarc* Antarctic |
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Antarc* Antarctic |
op_relation |
http://petrology.oxfordjournals.org/cgi/content/short/40/7/1065 http://dx.doi.org/10.1093/petroj/40.7.1065 |
op_rights |
Copyright (C) 1999, Oxford University Press |
op_doi |
https://doi.org/10.1093/petroj/40.7.1065 |
container_title |
Journal of Petrology |
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40 |
container_issue |
7 |
container_start_page |
1065 |
op_container_end_page |
1087 |
_version_ |
1766276695495540736 |