Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust
The north‐eastern part of the Chotanagpur Granite Gneiss Complex (CGGC) in the East Indian shield contains enclaves of migmatitic pelitic granulites (PG) within felsic orthogneiss (FOG). Field observations, petrology and geochronology (LA–MC–ICP–MS U–Pb dating of zircon and EPMA Th–U–total‐Pb dating...
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crwiley:10.1002/gj.3552 2024-10-06T13:44:18+00:00 Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust Dey, Anindita Karmakar, Shreya Ibanez‐Mejia, Mauricio Mukherjee, Subham Sanyal, Sanjoy Sengupta, Pulak Chalapathi Rao, N. V. Intelligence Community Postdoctoral Research Fellowship Program University Grants Commission- Nepal 2019 http://dx.doi.org/10.1002/gj.3552 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgj.3552 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.3552 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.3552 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geological Journal volume 55, issue 4, page 2851-2880 ISSN 0072-1050 1099-1034 journal-article 2019 crwiley https://doi.org/10.1002/gj.3552 2024-09-11T04:12:32Z The north‐eastern part of the Chotanagpur Granite Gneiss Complex (CGGC) in the East Indian shield contains enclaves of migmatitic pelitic granulites (PG) within felsic orthogneiss (FOG). Field observations, petrology and geochronology (LA–MC–ICP–MS U–Pb dating of zircon and EPMA Th–U–total‐Pb dating of monazite) of the PG suggest two distinct metamorphic events. The earliest event M1, which is characterized by high‐temperature (>850°C) granulite facies metamorphism, occurred in the timespan of ~1680–1580 Ma. Extensive dehydration melting of biotite + sillimanite + quartz‐rich protoliths led to stabilization of the restitic assemblage (garnet + alkali‐feldspar + quartz + sillimanite + ferrian‐ilmenite) together with large volumes of felsic melts (leucosomes). Collisional tectonics followed by delamination and asthenospheric upwelling could have triggered the M1 event. Subsequently, at ~1470–1400 Ma, the igneous protolith of the host FOG intruded and hydrated the PG. Thereafter, a second metamorphic event, M2, accompanied by compressional structures, affected both the rock types. A clockwise P–T path that culminated at ≥10 kbar ~760–850°C and is followed by a steeply decompressive retrograde path characterizes this event. The P–T path and the inferred geothermal gradient (<27°C/km) are compatible with a continent–continent collisional setting. Geochronological findings suggest a protracted orogeny for the M2 event with its major pulse during ~970–950 Ma. When combined with the published information, this study supports the view that a large (if not the entire) portion of the Indian shield and the granulite terranes of east Antarctica share similar tectonothermal events that led to the formation of two supercontinents, Columbia and Rodinia. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Wiley Online Library East Antarctica Indian Geological Journal 55 4 2851 2880 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The north‐eastern part of the Chotanagpur Granite Gneiss Complex (CGGC) in the East Indian shield contains enclaves of migmatitic pelitic granulites (PG) within felsic orthogneiss (FOG). Field observations, petrology and geochronology (LA–MC–ICP–MS U–Pb dating of zircon and EPMA Th–U–total‐Pb dating of monazite) of the PG suggest two distinct metamorphic events. The earliest event M1, which is characterized by high‐temperature (>850°C) granulite facies metamorphism, occurred in the timespan of ~1680–1580 Ma. Extensive dehydration melting of biotite + sillimanite + quartz‐rich protoliths led to stabilization of the restitic assemblage (garnet + alkali‐feldspar + quartz + sillimanite + ferrian‐ilmenite) together with large volumes of felsic melts (leucosomes). Collisional tectonics followed by delamination and asthenospheric upwelling could have triggered the M1 event. Subsequently, at ~1470–1400 Ma, the igneous protolith of the host FOG intruded and hydrated the PG. Thereafter, a second metamorphic event, M2, accompanied by compressional structures, affected both the rock types. A clockwise P–T path that culminated at ≥10 kbar ~760–850°C and is followed by a steeply decompressive retrograde path characterizes this event. The P–T path and the inferred geothermal gradient (<27°C/km) are compatible with a continent–continent collisional setting. Geochronological findings suggest a protracted orogeny for the M2 event with its major pulse during ~970–950 Ma. When combined with the published information, this study supports the view that a large (if not the entire) portion of the Indian shield and the granulite terranes of east Antarctica share similar tectonothermal events that led to the formation of two supercontinents, Columbia and Rodinia. |
author2 |
Chalapathi Rao, N. V. Intelligence Community Postdoctoral Research Fellowship Program University Grants Commission- Nepal |
format |
Article in Journal/Newspaper |
author |
Dey, Anindita Karmakar, Shreya Ibanez‐Mejia, Mauricio Mukherjee, Subham Sanyal, Sanjoy Sengupta, Pulak |
spellingShingle |
Dey, Anindita Karmakar, Shreya Ibanez‐Mejia, Mauricio Mukherjee, Subham Sanyal, Sanjoy Sengupta, Pulak Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
author_facet |
Dey, Anindita Karmakar, Shreya Ibanez‐Mejia, Mauricio Mukherjee, Subham Sanyal, Sanjoy Sengupta, Pulak |
author_sort |
Dey, Anindita |
title |
Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
title_short |
Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
title_full |
Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
title_fullStr |
Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
title_full_unstemmed |
Petrology and geochronology of a suite of pelitic granulites from parts of the Chotanagpur Granite Gneiss Complex, eastern India: Evidence for Stenian‐Tonian reworking of a late Paleoproterozoic crust |
title_sort |
petrology and geochronology of a suite of pelitic granulites from parts of the chotanagpur granite gneiss complex, eastern india: evidence for stenian‐tonian reworking of a late paleoproterozoic crust |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/gj.3552 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgj.3552 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.3552 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.3552 |
geographic |
East Antarctica Indian |
geographic_facet |
East Antarctica Indian |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Geological Journal volume 55, issue 4, page 2851-2880 ISSN 0072-1050 1099-1034 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/gj.3552 |
container_title |
Geological Journal |
container_volume |
55 |
container_issue |
4 |
container_start_page |
2851 |
op_container_end_page |
2880 |
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1812182702969847808 |