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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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/213240 2024-01-14T09:59:50+01:00 Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints Aitchison, Jonathan Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie application/pdf http://hdl.handle.net/1885/213240 https://doi.org/10.1029/2018TC005049 https://openresearch-repository.anu.edu.au/bitstream/1885/213240/3/01_Aitchison_Tectonic_Evolution_of_the_2019.pdf.jpg en_AU eng American Geophysical Union 0278-7407 http://hdl.handle.net/1885/213240 doi:10.1029/2018TC005049 https://openresearch-repository.anu.edu.au/bitstream/1885/213240/3/01_Aitchison_Tectonic_Evolution_of_the_2019.pdf.jpg ©2019. The Authors. https://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution‐NonCommercial‐NoDerivs License Tectonics Journal article ftanucanberra https://doi.org/10.1029/2018TC005049 2023-12-15T09:36:17Z 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. This project was supported by funding from the Australian and Indian Governments under the Australia India Strategic Research Fund, Project AISRF07021 “Inter‐dependencies of deep crustal and surficial geological processes during continental collision.” Article in Journal/Newspaper Antarc* Antarctica East Antarctica Australian National University: ANU Digital Collections East Antarctica Indian Tectonics 38 5 1718 1741 |
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Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
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. This project was supported by funding from the Australian and Indian Governments under the Australia India Strategic Research Fund, Project AISRF07021 “Inter‐dependencies of deep crustal and surficial geological processes during continental collision.” |
format |
Article in Journal/Newspaper |
author |
Aitchison, Jonathan Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie |
spellingShingle |
Aitchison, Jonathan Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor 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 |
author_facet |
Aitchison, Jonathan Ao, Aliba Bhowmik, Santanu Clarke, Geoffrey L. Ireland, Trevor Kachovich, Sarah Lokho, Kapesa Stojanovic, Denis Roeder, Tara Truscott, Naomi Zhen, Yan Zhou, Renjie |
author_sort |
Aitchison, Jonathan |
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 |
url |
http://hdl.handle.net/1885/213240 https://doi.org/10.1029/2018TC005049 https://openresearch-repository.anu.edu.au/bitstream/1885/213240/3/01_Aitchison_Tectonic_Evolution_of_the_2019.pdf.jpg |
geographic |
East Antarctica Indian |
geographic_facet |
East Antarctica Indian |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Tectonics |
op_relation |
0278-7407 http://hdl.handle.net/1885/213240 doi:10.1029/2018TC005049 https://openresearch-repository.anu.edu.au/bitstream/1885/213240/3/01_Aitchison_Tectonic_Evolution_of_the_2019.pdf.jpg |
op_rights |
©2019. The Authors. https://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution‐NonCommercial‐NoDerivs License |
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_ |
1788061156910301184 |