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Mid-Neoproterozoic extensional tectonics in the Larsemann Hills, East Antarctica: Implications for Indo-Antarctic correlation in Rodinia

2026-02Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências da Terra e do Ambiente
dc.contributor.authorChatterjee, Sandro
dc.contributor.authorDev, J. Amal
dc.contributor.authorDebnath, Aishi
dc.contributor.authorGhosh, Anuj
dc.contributor.authorDey, Soham
dc.contributor.authorMukherjee, Anik
dc.contributor.authorArora, Devsamridhi
dc.contributor.authorTomson, Joseph Kallukalam
dc.contributor.authorGuimarães, Fernanda
dc.contributor.authorPant, Naresh Chandra
dc.contributor.authorGupta, Saibal
dc.date.accessioned2026-03-04T11:23:41Z
dc.date.available2026-03-04T11:23:41Z
dc.date.issued2026-02
dc.description.abstractABSTRACT: The supercontinents Rodinia and Gondwana are believed to have assembled through orogenic events at similar to 1000 Ma and similar to 550 Ma, respectively. The Larsemann Hills, part of the extended Rayner Complex of East Antarctica, is a Neoproterozoic granulite terrane that was a part of both supercontinents. The tectonic evolution of the terrane in the Rodinia to Gondwana interval remains uncertain. This study integrates new field, microstructural, metamorphic and geochronological information to unveil a previously undocumented mid-Neoproterozoic thermo-tectonic event in the Larsemann Hills. Granulite facies metamorphism (M-1), synchronous with the deformation, D-1, is interpreted to have occurred in the Larsemann Hills at similar to 1000 Ma, followed by a crustal shortening (D-2) event that continued from similar to 990-900 Ma, signifying the incorporation of the Rayner crustal unit into Rodinia. Subsequent mid-Neoproterozoic extensional deformation (D-3), characterized by NW-SE trending S-3 shear zones, reoriented pre-existing structural fabrics. The extensional deformation operated under amphibolite facies metamorphic conditions (M-2) and resulted in a post-peak decompressive P-T trajectory. UPb LA-ICPMS dates on zircons separated from metapelites within high D-3 strain zone yield clusters at similar to 700 Ma; zircons immediately adjacent to the shear zone yield ages around similar to 990-900 Ma. A thermal overprint at similar to 550 Ma is evident but weakly manifested in the western Larsemann Hills, with no unambiguously correlatable structural or metamorphic evidence, suggesting distance from the Gondwana orogenic front. The extensional deformation documented here is contemporaneous with extension in the northern Eastern Ghats Province, India that was contiguous with the Rayner Complex in the Neoproterozoic. This suggests that a major terrane-wide extensional event was associated with the disintegration of Rodinia. In the Neoproterozoic, the EGP-Rayner unit was therefore a tectonic entity distinct from cratonic India, with only the former being an integral component of Rodinia.eng
dc.identifier.citationChatterjee, S., Dev, J. A., Debnath, A., Ghosh, A., Dey, S., Mukherjee, A., Arora, D., Tomson, J.K. , Guimarães, F., Pant, N.C., & Gupta, S. (2026). Mid-Neoproterozoic extensional tectonics in the Larsemann Hills, East Antarctica: Implications for Indo-Antarctic correlation in Rodinia. In: Lithos, 2026, vol. 522–523, article 108358. https://doi.org/10.1016/j.lithos.2025.108358
dc.identifier.doi10.1016/j.lithos.2025.108358
dc.identifier.issn0024-4937
dc.identifier.urihttp://hdl.handle.net/10400.9/6289
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationElectron and X-ray microscopy Community for structural and chemical Imaging Techniques for Earth materials
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0024493725004177?pes=vor&utm_source=clarivate&getft_integrator=clarivate
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectNeoproterozoic
dc.subjectZircon
dc.subjectU-Pb geochronology
dc.subjectGeological evolution
dc.subjectAntarctica
dc.titleMid-Neoproterozoic extensional tectonics in the Larsemann Hills, East Antarctica: Implications for Indo-Antarctic correlation in Rodiniaeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumber101005611
oaire.awardTitleElectron and X-ray microscopy Community for structural and chemical Imaging Techniques for Earth materials
oaire.awardURIhttp://hdl.handle.net/10400.9/6288
oaire.citation.titleLithos: Journal of Petrology, Mineralogy and Geochemistry
oaire.citation.volume522–523
oaire.fundingStreamResearch and Innovation action
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameDev
person.familyNameArora
person.familyNameGuimarães
person.familyNamePant
person.givenNameJ. Amal
person.givenNameDevsamridhi
person.givenNameFernanda
person.givenNameNaresh Chandra
person.identifier.orcid0000-0001-9625-0204
person.identifier.orcid0000-0003-1790-6960
person.identifier.orcid0000-0001-6961-9256
person.identifier.orcid0000-0002-3204-0563
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relation.isAuthorOfPublication.latestForDiscoverye65ebde8-5640-44b7-899c-9c30c906f5ac
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relation.isProjectOfPublication.latestForDiscovery2300ef31-1e68-43d2-bf06-1f1d78dd717c

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