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Article: Geochemistry and geochronology of the amphibolite blocks in ophiolitic mélanges along Bangong-Nujiang suture, central Tibet

TitleGeochemistry and geochronology of the amphibolite blocks in ophiolitic mélanges along Bangong-Nujiang suture, central Tibet
Authors
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal of Asian Earth Sciences, 2008, v.33 n. 1–2, p. 122–138 How to Cite?
AbstractAmphibolites occur as blocks within serpentinite-matrix mélange at Dong Tso and Lagkor Tso in the Gertse area of central Tibet, where they are associated with the Bangong-Nujiang suture (BNS). Geochemical data shows amphibolites have similar MORB or arc-like MORB geochemical characteristics. Lagkor Tso amphibolites show greater arc affinity, whereas those from Dong Tso amphibolites are more MORB-like. These characteristics are similar to basalts from continental back-arc basin settings. Hornblendes from the amphibolites dated by the 40Ar/39Ar single-grain laser fusion technique show similar metamorphic ages ∼170–177 Ma, which is interpreted to represent the timing of the main metamorphic event experienced in this region. We suggest that the western and middle sectors of the BNS contain the remnants of a short-lived back-arc basin (the Bangong-Nujiang ocean), which partly opened and closed in the Middle Jurassic.
Persistent Identifierhttp://hdl.handle.net/10722/73017
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393

 

DC FieldValueLanguage
dc.contributor.authorWang, Wen_HK
dc.contributor.authorAitchison, JCen_HK
dc.contributor.authorLo, CHen_HK
dc.contributor.authorZeng, QGen_HK
dc.date.accessioned2010-09-06T06:47:16Z-
dc.date.available2010-09-06T06:47:16Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal of Asian Earth Sciences, 2008, v.33 n. 1–2, p. 122–138en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73017-
dc.description.abstractAmphibolites occur as blocks within serpentinite-matrix mélange at Dong Tso and Lagkor Tso in the Gertse area of central Tibet, where they are associated with the Bangong-Nujiang suture (BNS). Geochemical data shows amphibolites have similar MORB or arc-like MORB geochemical characteristics. Lagkor Tso amphibolites show greater arc affinity, whereas those from Dong Tso amphibolites are more MORB-like. These characteristics are similar to basalts from continental back-arc basin settings. Hornblendes from the amphibolites dated by the 40Ar/39Ar single-grain laser fusion technique show similar metamorphic ages ∼170–177 Ma, which is interpreted to represent the timing of the main metamorphic event experienced in this region. We suggest that the western and middle sectors of the BNS contain the remnants of a short-lived back-arc basin (the Bangong-Nujiang ocean), which partly opened and closed in the Middle Jurassic.-
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.titleGeochemistry and geochronology of the amphibolite blocks in ophiolitic mélanges along Bangong-Nujiang suture, central Tibeten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=&spage=doi:10.1016/j.jseaes.2007.10.022&epage=&date=2007&atitle=Geochemistry+and+geochronology+of+the+amphibolites+in+ophiolitic+blocks+along+Bangong-Nujiang+suture,+central+Tibeten_HK
dc.identifier.emailWang, W: weiliang@hkusua.hku.hken_HK
dc.identifier.emailAitchison, JC: jona@hku.hken_HK
dc.identifier.authorityAitchison, JC=rp00658en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2007.10.022-
dc.identifier.hkuros139359en_HK

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