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Article: Low temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications

TitleLow temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications
Authors
KeywordsEastern Himalayan Syntaxis
LT eclogite facies rock
poly-cyclic metamorphism
P–T path
subduction channel
Issue Date2023
Citation
Journal of Metamorphic Geology, 2023, v. 41, n. 1, p. 97-119 How to Cite?
AbstractWe report the first occurrence of poly-cyclic high-pressure low-temperature (HP-LT) rocks from the easternmost Indus-Yarlung suture zone, formed during subduction of Neo-Tethyan oceanic lithosphere. Petrology, mineral composition and P–T pseudosection modelling reveal two low-temperature eclogite facies metamorphic events with an initial high-pressure P–T condition of 16.4–18.7 kbar and 510–520°C, exhumation to 10.5–12.0 kbar and 580–590°C and a subsequent second high-pressure P–T condition of ~16 kbar and ~560°C and exhumation to ≤9 kbar and ≤600°C. This history implies a complex ‘yo-yo type’ P–T path. In situ monazite dating and textural relationships show that late-stage exhumation, cooling and garnet breakdown occurred at c. ~25–22 Ma. We interpret the first burial event to represent subduction of the Neo-Tethys Ocean at the eastern Indus-Yarlung suture zone. Initial exhumation, reburial and final exhumation represent material transport in a large-scale convective circulation system in the subduction channel. Convective overturn in the subduction channel evidently serves both as a mechanism to produce poly-cyclic metamorphism and to exhume LT eclogite facies rocks.
Persistent Identifierhttp://hdl.handle.net/10722/327428
ISSN
2023 Impact Factor: 3.5
2023 SCImago Journal Rankings: 1.646
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Wangchao-
dc.contributor.authorYin, Changqing-
dc.contributor.authorZhang, Zeming-
dc.contributor.authorCawood, Peter A.-
dc.contributor.authorLi, Shun-
dc.contributor.authorZhang, Jian-
dc.contributor.authorDing, Huixia-
dc.contributor.authorQian, Jiahui-
dc.contributor.authorZhang, Yanling-
dc.date.accessioned2023-03-31T05:31:16Z-
dc.date.available2023-03-31T05:31:16Z-
dc.date.issued2023-
dc.identifier.citationJournal of Metamorphic Geology, 2023, v. 41, n. 1, p. 97-119-
dc.identifier.issn0263-4929-
dc.identifier.urihttp://hdl.handle.net/10722/327428-
dc.description.abstractWe report the first occurrence of poly-cyclic high-pressure low-temperature (HP-LT) rocks from the easternmost Indus-Yarlung suture zone, formed during subduction of Neo-Tethyan oceanic lithosphere. Petrology, mineral composition and P–T pseudosection modelling reveal two low-temperature eclogite facies metamorphic events with an initial high-pressure P–T condition of 16.4–18.7 kbar and 510–520°C, exhumation to 10.5–12.0 kbar and 580–590°C and a subsequent second high-pressure P–T condition of ~16 kbar and ~560°C and exhumation to ≤9 kbar and ≤600°C. This history implies a complex ‘yo-yo type’ P–T path. In situ monazite dating and textural relationships show that late-stage exhumation, cooling and garnet breakdown occurred at c. ~25–22 Ma. We interpret the first burial event to represent subduction of the Neo-Tethys Ocean at the eastern Indus-Yarlung suture zone. Initial exhumation, reburial and final exhumation represent material transport in a large-scale convective circulation system in the subduction channel. Convective overturn in the subduction channel evidently serves both as a mechanism to produce poly-cyclic metamorphism and to exhume LT eclogite facies rocks.-
dc.languageeng-
dc.relation.ispartofJournal of Metamorphic Geology-
dc.subjectEastern Himalayan Syntaxis-
dc.subjectLT eclogite facies rock-
dc.subjectpoly-cyclic metamorphism-
dc.subjectP–T path-
dc.subjectsubduction channel-
dc.titleLow temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/jmg.12689-
dc.identifier.scopuseid_2-s2.0-85137517833-
dc.identifier.volume41-
dc.identifier.issue1-
dc.identifier.spage97-
dc.identifier.epage119-
dc.identifier.eissn1525-1314-
dc.identifier.isiWOS:000850900400001-

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