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Article: Low temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications
Title | Low temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications |
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Authors | |
Keywords | Eastern Himalayan Syntaxis LT eclogite facies rock poly-cyclic metamorphism P–T path subduction channel |
Issue Date | 2023 |
Citation | Journal of Metamorphic Geology, 2023, v. 41, n. 1, p. 97-119 How to Cite? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/327428 |
ISSN | 2023 Impact Factor: 3.5 2023 SCImago Journal Rankings: 1.646 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Li, Wangchao | - |
dc.contributor.author | Yin, Changqing | - |
dc.contributor.author | Zhang, Zeming | - |
dc.contributor.author | Cawood, Peter A. | - |
dc.contributor.author | Li, Shun | - |
dc.contributor.author | Zhang, Jian | - |
dc.contributor.author | Ding, Huixia | - |
dc.contributor.author | Qian, Jiahui | - |
dc.contributor.author | Zhang, Yanling | - |
dc.date.accessioned | 2023-03-31T05:31:16Z | - |
dc.date.available | 2023-03-31T05:31:16Z | - |
dc.date.issued | 2023 | - |
dc.identifier.citation | Journal of Metamorphic Geology, 2023, v. 41, n. 1, p. 97-119 | - |
dc.identifier.issn | 0263-4929 | - |
dc.identifier.uri | http://hdl.handle.net/10722/327428 | - |
dc.description.abstract | We 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.language | eng | - |
dc.relation.ispartof | Journal of Metamorphic Geology | - |
dc.subject | Eastern Himalayan Syntaxis | - |
dc.subject | LT eclogite facies rock | - |
dc.subject | poly-cyclic metamorphism | - |
dc.subject | P–T path | - |
dc.subject | subduction channel | - |
dc.title | Low temperature eclogite facies rocks discovered in the Eastern Himalayan Syntaxis: Poly-cyclic metamorphic evolution and implications | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1111/jmg.12689 | - |
dc.identifier.scopus | eid_2-s2.0-85137517833 | - |
dc.identifier.volume | 41 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 97 | - |
dc.identifier.epage | 119 | - |
dc.identifier.eissn | 1525-1314 | - |
dc.identifier.isi | WOS:000850900400001 | - |