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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

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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...[Show more]

dc.contributor.authorAitchison, Jonathan
dc.contributor.authorAo, Aliba
dc.contributor.authorBhowmik, Santanu
dc.contributor.authorClarke, Geoffrey L.
dc.contributor.authorIreland, Trevor
dc.contributor.authorKachovich, Sarah
dc.contributor.authorLokho, Kapesa
dc.contributor.authorStojanovic, Denis
dc.contributor.authorRoeder, Tara
dc.contributor.authorTruscott, Naomi
dc.contributor.authorZhen, Yan
dc.contributor.authorZhou, Renjie
dc.date.accessioned2020-10-29T23:41:57Z
dc.date.available2020-10-29T23:41:57Z
dc.identifier.issn0278-7407
dc.identifier.urihttp://hdl.handle.net/1885/213240
dc.description.abstractResults 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.
dc.description.sponsorshipThis 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.”
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAmerican Geophysical Union
dc.rights©2019. The Authors.
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceTectonics
dc.titleTectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume38
dc.date.issued2019
local.identifier.absfor040313 - Tectonics
local.identifier.absfor040303 - Geochronology
local.identifier.ariespublicationu3102795xPUB4915
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationAitchison, Jonathan , The University of Queensland
local.contributor.affiliationAo, Aliba, Indian Institute of Technology
local.contributor.affiliationBhowmik, Santanu, Indian Institute of Technology, Kharagpur
local.contributor.affiliationClarke, Geoffrey L., University of Sydney
local.contributor.affiliationIreland, Trevor, College of Science, ANU
local.contributor.affiliationKachovich, Sarah, University of Queensland
local.contributor.affiliationLokho, Kapesa, Wadia Institute of Himalayan Geology
local.contributor.affiliationStojanovic, Denis, University of Queensland
local.contributor.affiliationRoeder, Tara, University of Sydney
local.contributor.affiliationTruscott, Naomi, University of Sydney
local.contributor.affiliationZhen, Yan, Chinese Academy of Geological Sciences
local.contributor.affiliationZhou, Renjie, Chinese Academy of Geological Sciences
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage1718
local.bibliographicCitation.lastpage1741
local.identifier.doi10.1029/2018TC005049
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-07-06T08:22:35Z
local.identifier.thomsonIDWOS:000472819300009
dcterms.accessRightsOpen Access
dc.provenance©2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
dc.rights.licenseCreative Commons Attribution‐NonCommercial‐NoDerivs License
CollectionsANU Research Publications

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