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Article: Geochronology and Precambrian tectonic evolution of the Namche Barwa complex from the Eastern Himalayan syntaxis, Tibet

TitleGeochronology and Precambrian tectonic evolution of the Namche Barwa complex from the Eastern Himalayan syntaxis, Tibet
Authors
KeywordsCranulite
Geochronology
Himalayan orogen
Namche Barwa complex
Precambrian tectonic-magmatic event
Supercontinent
Issue Date2008
PublisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspx
Citation
Acta Petrologica Sinica, 2008, v. 24 n. 7, p. 1477-1487 How to Cite?
AbstractThe Namche Barwa complex located in the eastern syntaxis of the Himalayan orogenic belt and south of the India-Yarlung Tsangpo suture zone has been subjected to the high-pressure regional metamorphism and intensely migmatization. The felsic gneisses distributing widely in this area were chosen to study its lithology and isotopic geochronology. Most of the gneisses have the metamorphic mineral assemblages of amphibolite facies except minor pelitic gneisses with a high-pressure granulite facies mineral assemblage of garnet + kyanite + ternary feldspar + quartz. Most of their protoliths are diorite and granodiorite characterized by the chemical composition of igneous rocks formed in a magmatic arc environment. The zircons in gneisses commonly have a core-rim texture. SHRIMP and LA-ICP-MS U-Pb zircon in-situ analyses indicate that the zircon rims give multi-stage metamorphic and magmatic event ages ranging from 500Ma to 10Ma, while the zircon cores yield at least four populations of Precambrian ages: ∼2500Ma, ∼1800Ma, ∼1600Ma and ∼1000Ma. The zircon grains analyzed show obvious magmatic crystallization zoning and have relatively high Th/U ratios, typical of magmatic origin, and thus these four populations of ages are interpreted as ages of multiphase Precambrian tectonic-magmatic events. Moreover, these ages are comparable to those of Precambrian tectonic-magmatic events of the Greater Himalayan Crystalline complex and the Indian craton. Therefore, we conclude that the protoliths of the Namche Barwa complex and the Greater Himalayan Crystalline rock may have been derived from the intrusive rocks formed from the late Archean to the late Proterozoic, recorded the formation and breakup of the Columbia, Rodinia and Gondwana supercontinent, and undergone the regional metamorphism and magmatism during the Himalayan orogeny.
Persistent Identifierhttp://hdl.handle.net/10722/58665
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, ZMen_HK
dc.contributor.authorWang, JLen_HK
dc.contributor.authorZhao, GCen_HK
dc.contributor.authorShi, Cen_HK
dc.date.accessioned2010-05-31T03:34:39Z-
dc.date.available2010-05-31T03:34:39Z-
dc.date.issued2008en_HK
dc.identifier.citationActa Petrologica Sinica, 2008, v. 24 n. 7, p. 1477-1487en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58665-
dc.description.abstractThe Namche Barwa complex located in the eastern syntaxis of the Himalayan orogenic belt and south of the India-Yarlung Tsangpo suture zone has been subjected to the high-pressure regional metamorphism and intensely migmatization. The felsic gneisses distributing widely in this area were chosen to study its lithology and isotopic geochronology. Most of the gneisses have the metamorphic mineral assemblages of amphibolite facies except minor pelitic gneisses with a high-pressure granulite facies mineral assemblage of garnet + kyanite + ternary feldspar + quartz. Most of their protoliths are diorite and granodiorite characterized by the chemical composition of igneous rocks formed in a magmatic arc environment. The zircons in gneisses commonly have a core-rim texture. SHRIMP and LA-ICP-MS U-Pb zircon in-situ analyses indicate that the zircon rims give multi-stage metamorphic and magmatic event ages ranging from 500Ma to 10Ma, while the zircon cores yield at least four populations of Precambrian ages: ∼2500Ma, ∼1800Ma, ∼1600Ma and ∼1000Ma. The zircon grains analyzed show obvious magmatic crystallization zoning and have relatively high Th/U ratios, typical of magmatic origin, and thus these four populations of ages are interpreted as ages of multiphase Precambrian tectonic-magmatic events. Moreover, these ages are comparable to those of Precambrian tectonic-magmatic events of the Greater Himalayan Crystalline complex and the Indian craton. Therefore, we conclude that the protoliths of the Namche Barwa complex and the Greater Himalayan Crystalline rock may have been derived from the intrusive rocks formed from the late Archean to the late Proterozoic, recorded the formation and breakup of the Columbia, Rodinia and Gondwana supercontinent, and undergone the regional metamorphism and magmatism during the Himalayan orogeny.en_HK
dc.languageengen_HK
dc.publisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspxen_HK
dc.relation.ispartofActa Petrologica Sinicaen_HK
dc.subjectCranuliteen_HK
dc.subjectGeochronologyen_HK
dc.subjectHimalayan orogenen_HK
dc.subjectNamche Barwa complexen_HK
dc.subjectPrecambrian tectonic-magmatic eventen_HK
dc.subjectSupercontinenten_HK
dc.titleGeochronology and Precambrian tectonic evolution of the Namche Barwa complex from the Eastern Himalayan syntaxis, Tibeten_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, GC=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-58149337530en_HK
dc.identifier.hkuros154943en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-58149337530&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue7en_HK
dc.identifier.spage1477en_HK
dc.identifier.epage1487en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridZhang, ZM=9939613100en_HK
dc.identifier.scopusauthoridWang, JL=9248030900en_HK
dc.identifier.scopusauthoridZhao, GC=7403296321en_HK
dc.identifier.scopusauthoridShi, C=37071148000en_HK

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