Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia
A suite of Mg–Al granulites from two new localities in the Eastern Ghats Province are investigated to put constraints on: (a) the thermal and baric evolution of these rocks; (b) the timing of high-grade metamorphisms (chemical dating of monazite); (c) the tectonic setting where the high-grade metamo...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3771044.v1 https://figshare.com/collections/Reaction_textures_pressure_temperature_paths_and_chemical_dates_of_monazite_from_a_new_suite_of_sapphirine_spinel_granulites_from_parts_of_the_Eastern_Ghats_Province_India_insights_into_the_final_amalgamation_of_India_and_East_Antarctica_during_the_format/3771044/1 |
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ftdatacite:10.6084/m9.figshare.c.3771044.v1 2023-05-15T14:01:25+02:00 Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia Enakshi Das Karmakar, Subrata Anindita Dey Karmakar, Shreya Pulak Sengupta 2017 https://dx.doi.org/10.6084/m9.figshare.c.3771044.v1 https://figshare.com/collections/Reaction_textures_pressure_temperature_paths_and_chemical_dates_of_monazite_from_a_new_suite_of_sapphirine_spinel_granulites_from_parts_of_the_Eastern_Ghats_Province_India_insights_into_the_final_amalgamation_of_India_and_East_Antarctica_during_the_format/3771044/1 unknown Figshare https://dx.doi.org/10.1144/sp457.12 https://dx.doi.org/10.6084/m9.figshare.c.3771044 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3771044.v1 https://doi.org/10.1144/sp457.12 https://doi.org/10.6084/m9.figshare.c.3771044 2021-11-05T12:55:41Z A suite of Mg–Al granulites from two new localities in the Eastern Ghats Province are investigated to put constraints on: (a) the thermal and baric evolution of these rocks; (b) the timing of high-grade metamorphisms (chemical dating of monazite); (c) the tectonic setting where the high-grade metamorphisms occurred; and (d) a possible link between India and East Antarctica during the formation of the Rodinia supercontinent. Supporting the proposition of poly-metamorphism over single metamorphism, our study documents at least two distinct phases of high-grade metamorphism that occurred in two contrasting tectonic settings. Reconstructed pristine spinel composition from oxide aggregates, the Al content of coronitic orthopyroxene over sapphirine and spinel, and the constraints of the FeO–MgO–Al 2 O 3 –SiO 2 (FMAS) topology in the FMAS system document temperatures in excess of 1070°C at 8–9 kbar pressure (>1100°C GPa -1 ). This study shows that such an extreme metamorphic condition was reached along a counter-clockwise P – T trajectory presumably in an extensional setting at approximately 1.2 Ga. The eventual collision of India and East Antarctica reworked the near-isobarically cooled assemblages of the first event, and triggered exhumation of the former lower crust to the upper-crustal depth along a steeply decompressive trajectory during the formation of the Rodinia supercontinent ( c . 0.95–0.90 Ga). Article in Journal/Newspaper Antarc* Antarctica East Antarctica DataCite Metadata Store (German National Library of Science and Technology) East Antarctica |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Enakshi Das Karmakar, Subrata Anindita Dey Karmakar, Shreya Pulak Sengupta Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
A suite of Mg–Al granulites from two new localities in the Eastern Ghats Province are investigated to put constraints on: (a) the thermal and baric evolution of these rocks; (b) the timing of high-grade metamorphisms (chemical dating of monazite); (c) the tectonic setting where the high-grade metamorphisms occurred; and (d) a possible link between India and East Antarctica during the formation of the Rodinia supercontinent. Supporting the proposition of poly-metamorphism over single metamorphism, our study documents at least two distinct phases of high-grade metamorphism that occurred in two contrasting tectonic settings. Reconstructed pristine spinel composition from oxide aggregates, the Al content of coronitic orthopyroxene over sapphirine and spinel, and the constraints of the FeO–MgO–Al 2 O 3 –SiO 2 (FMAS) topology in the FMAS system document temperatures in excess of 1070°C at 8–9 kbar pressure (>1100°C GPa -1 ). This study shows that such an extreme metamorphic condition was reached along a counter-clockwise P – T trajectory presumably in an extensional setting at approximately 1.2 Ga. The eventual collision of India and East Antarctica reworked the near-isobarically cooled assemblages of the first event, and triggered exhumation of the former lower crust to the upper-crustal depth along a steeply decompressive trajectory during the formation of the Rodinia supercontinent ( c . 0.95–0.90 Ga). |
format |
Article in Journal/Newspaper |
author |
Enakshi Das Karmakar, Subrata Anindita Dey Karmakar, Shreya Pulak Sengupta |
author_facet |
Enakshi Das Karmakar, Subrata Anindita Dey Karmakar, Shreya Pulak Sengupta |
author_sort |
Enakshi Das |
title |
Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
title_short |
Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
title_full |
Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
title_fullStr |
Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
title_full_unstemmed |
Reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the Eastern Ghats Province, India: insights into the final amalgamation of India and East Antarctica during the formation of Rodinia |
title_sort |
reaction textures, pressure–temperature paths and chemical dates of monazite from a new suite of sapphirine–spinel granulites from parts of the eastern ghats province, india: insights into the final amalgamation of india and east antarctica during the formation of rodinia |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3771044.v1 https://figshare.com/collections/Reaction_textures_pressure_temperature_paths_and_chemical_dates_of_monazite_from_a_new_suite_of_sapphirine_spinel_granulites_from_parts_of_the_Eastern_Ghats_Province_India_insights_into_the_final_amalgamation_of_India_and_East_Antarctica_during_the_format/3771044/1 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
https://dx.doi.org/10.1144/sp457.12 https://dx.doi.org/10.6084/m9.figshare.c.3771044 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3771044.v1 https://doi.org/10.1144/sp457.12 https://doi.org/10.6084/m9.figshare.c.3771044 |
_version_ |
1766271231267438592 |