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dc.contributor.authorRajkakati, M
dc.contributor.authorBhowmik, SK
dc.contributor.authorAo, A
dc.contributor.authorIreland, TR
dc.contributor.authorAvila, J
dc.contributor.authorClarke, GL
dc.contributor.authorBhandari, A
dc.contributor.authorAitchison, JC
dc.description.abstractEclogite from two locations in a fossil accretionary complex now exposed in Nagaland, NE India, at the northern end of the Indo-Myanmar ranges, provides the oldest evidence for Neo-Tethyan subduction along the Yarlung-Tsangpo suture zone. Metamorphic texture, mineral composition, peak metamorphic P-T estimates, reconstructed metamorphic P-T paths, and U–Pb zircon ages from three eclogite samples collected near Mokie and Thewati villages collectively reveal snapshots of a c. 205–172 Ma subduction burial-exhumation cycle in the eastern Neo-Tethys. The Thewati eclogite records a clockwise metamorphic P-T path involving: (1) prograde metamorphism traversing the epidote blueschist facies and culminated in peak eclogite facies conditions at 25–28 kbar and ~650 °C; (2) an early retrograde stage involving decompression with cooling in the eclogite facies at ~18.3 kbar and 630 °C; followed by (3) cooling through the epidote blueschist, transitional lawsonite blueschist and greenschist facies to ~6 kbar and 300 °C. Circa 189–185 Ma peak metamorphism is inferred for the Mokie and Thewati eclogites, and was accompanied by an apparently low thermal gradient (~7–8 °C/km). Such conditions and the clockwise P-T path are associated with a tectonic scenario involving cold mature subduction within the Neo-Tethys in Nagaland. This is thus the first comprehensive dataset of an Early Jurassic subduction channel (with respect to present geographic co-ordinates) for the eastern margin of the Neo-Tethyan suture. The Nagaland samples offer a critical record of a pre-Cretaceous subduction system within the Neo-Tethys, which incorporated an Early-Middle Jurassic Andean-type convergent margin extending along the southern Eurasian margin from Pakistan to the Indo-Myanmar Ranges.
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsGeochemistry & Geophysics
dc.titleThermal history of Early Jurassic eclogite facies metamorphism in the Nagaland Ophiolite Complex, NE India: New insights into pre-Cretaceous subduction channel tectonics within the Neo-Tethys
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationRajkakati, M; Bhowmik, SK; Ao, A; Ireland, TR; Avila, J; Clarke, GL; Bhandari, A; Aitchison, JC, Thermal history of Early Jurassic eclogite facies metamorphism in the Nagaland Ophiolite Complex, NE India: New insights into pre-Cretaceous subduction channel tectonics within the Neo-Tethys, Lithos, 2019, 346-347, 105166
gro.hasfulltextNo Full Text
gro.griffith.authorNunes Avila, Janaina

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