Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints
Results of biostratigraphic and geochronological investigations in eastern Nagaland and Manipur, NE India, provide new constraints on the tectonic evolution of the western margin of the Burma microplate. U/Pb zircon ages indicate that the Naga Hills ophiolite developed in a suprasubduction zone sett...
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ftindianacasci:oai:repository.ias.ac.in:116824 2023-05-15T13:44:24+02:00 Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie 2019 http://repository.ias.ac.in/116824/ https://doi.org/10.1029/2018TC005049 unknown American Geophysical Union Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie (2019) Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints Tectonics, 38 (5). pp. 1718-1741. ISSN 0278-7407 QE Geology Article PeerReviewed 2019 ftindianacasci https://doi.org/10.1029/2018TC005049 2021-06-20T12:42:18Z Results of biostratigraphic and geochronological investigations in eastern Nagaland and Manipur, NE India, provide new constraints on the tectonic evolution of the western margin of the Burma microplate. U/Pb zircon ages indicate that the Naga Hills ophiolite developed in a suprasubduction zone setting as part of an intraoceanic island arc developed during late Early Cretaceous (mid‐Aptian) time and is younger than similar rocks exposed along the Indus‐Yarlung Tsangpo suture zone. Radiolarian microfossils provide Jurassic and Cretaceous age constraints for Tethyan ocean floor sediments that were subducted beneath the forming ophiolite. Timing of the emplacement of these rocks onto the passive margin of eastern India is constrained by Paleocene/Eocene radiolarians in sediments over which the ophiolitic assemblage has been thrust. Previously undated schists and gneisses in the Naga Metamorphics are of Early Ordovician age, and their sedimentary protolith was most likely derived from sources in the south of Western Australian and East Antarctica. After Barrovian‐style metamorphism, these rocks were uplifted and eroded becoming an important source of detritus shed into the Eocene Phokphur Formation. This unit also contains abundant clasts sourced from the disrupted basement of the Naga Hills ophiolite, which it overlies. It also contains Permo‐Triassic‐aged detritus eroded off an enigmatic source that was possibly a continental convergent margin arc system somewhere along the northern margin of Gondwana. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Indian Academy of Sciences: Publication of Fellows East Antarctica Tectonics 38 5 1718 1741 |
institution |
Open Polar |
collection |
Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
topic_facet |
QE Geology |
description |
Results of biostratigraphic and geochronological investigations in eastern Nagaland and Manipur, NE India, provide new constraints on the tectonic evolution of the western margin of the Burma microplate. U/Pb zircon ages indicate that the Naga Hills ophiolite developed in a suprasubduction zone setting as part of an intraoceanic island arc developed during late Early Cretaceous (mid‐Aptian) time and is younger than similar rocks exposed along the Indus‐Yarlung Tsangpo suture zone. Radiolarian microfossils provide Jurassic and Cretaceous age constraints for Tethyan ocean floor sediments that were subducted beneath the forming ophiolite. Timing of the emplacement of these rocks onto the passive margin of eastern India is constrained by Paleocene/Eocene radiolarians in sediments over which the ophiolitic assemblage has been thrust. Previously undated schists and gneisses in the Naga Metamorphics are of Early Ordovician age, and their sedimentary protolith was most likely derived from sources in the south of Western Australian and East Antarctica. After Barrovian‐style metamorphism, these rocks were uplifted and eroded becoming an important source of detritus shed into the Eocene Phokphur Formation. This unit also contains abundant clasts sourced from the disrupted basement of the Naga Hills ophiolite, which it overlies. It also contains Permo‐Triassic‐aged detritus eroded off an enigmatic source that was possibly a continental convergent margin arc system somewhere along the northern margin of Gondwana. |
format |
Article in Journal/Newspaper |
author |
Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie |
author_facet |
Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie |
author_sort |
Aitchison, Jonathan C. |
title |
Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
title_short |
Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
title_full |
Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
title_fullStr |
Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
title_full_unstemmed |
Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints |
title_sort |
tectonic evolution of the western margin of the burma microplate based on new fossil and radiometric age constraints |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://repository.ias.ac.in/116824/ https://doi.org/10.1029/2018TC005049 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
Aitchison, Jonathan C. Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor R. Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie (2019) Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints Tectonics, 38 (5). pp. 1718-1741. ISSN 0278-7407 |
op_doi |
https://doi.org/10.1029/2018TC005049 |
container_title |
Tectonics |
container_volume |
38 |
container_issue |
5 |
container_start_page |
1718 |
op_container_end_page |
1741 |
_version_ |
1766201241495404544 |