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Article: Geochemistry and tectonic environment of the Dagzhuka ophiolite in the Yarlung-Zangbo suture zone, Tibet

TitleGeochemistry and tectonic environment of the Dagzhuka ophiolite in the Yarlung-Zangbo suture zone, Tibet
Authors
Issue Date2003
PublisherBusiness Center for Academic Societies Japan.
Citation
Geochemical Journal, 2003, v. 37 n. 3, p. 311-324 How to Cite?
AbstractThe Cretaceous Dagzhuka ophiolite lies in the middle segment of the Yarlung-Zangbo suture zone, Tibet, and has a well-preserved ophiolitic section including a mantle sequence, cumulate complex, diabase dyke swarm and basaltic lavas. Compared to the primitive mantle, tectonized peridotites in the Dagzhuka ophiolite are depleted in Al, Ca, Ti and high field strength elements, but relatively enriched in large ion lithophile elements (Rb, Ba, Th). They have U-shaped, chondrite-normalized REE patterns suggesting an early stage of depletion by partial melting, followed by enrichment from slab-derived fluids. These features support a model in which the mantle peridotites at Dagzhuka formed in a forearc setting. The diabases and basalts are low-K tholeiites depleted in LREE, with compositions similar to N-MORB. However, these rocks are strongly depleted in Nb and Ta but enriched in Th and Rb, features characteristic of island are lavas. Thus, the Dagzhuka ophiolite is believed to have formed in a supra-subduction zone environment, possibly a fore-arc basin.
Persistent Identifierhttp://hdl.handle.net/10722/72773
ISSN
2015 Impact Factor: 0.621
2015 SCImago Journal Rankings: 0.837
References

 

DC FieldValueLanguage
dc.contributor.authorXia, Ben_HK
dc.contributor.authorYu, HXen_HK
dc.contributor.authorChen, GWen_HK
dc.contributor.authorQi, Len_HK
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-09-06T06:44:58Z-
dc.date.available2010-09-06T06:44:58Z-
dc.date.issued2003en_HK
dc.identifier.citationGeochemical Journal, 2003, v. 37 n. 3, p. 311-324en_HK
dc.identifier.issn0016-7002en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72773-
dc.description.abstractThe Cretaceous Dagzhuka ophiolite lies in the middle segment of the Yarlung-Zangbo suture zone, Tibet, and has a well-preserved ophiolitic section including a mantle sequence, cumulate complex, diabase dyke swarm and basaltic lavas. Compared to the primitive mantle, tectonized peridotites in the Dagzhuka ophiolite are depleted in Al, Ca, Ti and high field strength elements, but relatively enriched in large ion lithophile elements (Rb, Ba, Th). They have U-shaped, chondrite-normalized REE patterns suggesting an early stage of depletion by partial melting, followed by enrichment from slab-derived fluids. These features support a model in which the mantle peridotites at Dagzhuka formed in a forearc setting. The diabases and basalts are low-K tholeiites depleted in LREE, with compositions similar to N-MORB. However, these rocks are strongly depleted in Nb and Ta but enriched in Th and Rb, features characteristic of island are lavas. Thus, the Dagzhuka ophiolite is believed to have formed in a supra-subduction zone environment, possibly a fore-arc basin.en_HK
dc.languageengen_HK
dc.publisherBusiness Center for Academic Societies Japan.en_HK
dc.relation.ispartofGeochemical Journalen_HK
dc.titleGeochemistry and tectonic environment of the Dagzhuka ophiolite in the Yarlung-Zangbo suture zone, Tibeten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-7002&volume= 37&spage=pp. 311&epage=324&date=2003&atitle=Geochemistry+and+tectonic+environment+of+the+Dagzhuka+ophiolite+in+the+Yarlung-Zangbo+suture+zone,+Tibeten_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0038322942en_HK
dc.identifier.hkuros82639en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038322942&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume37en_HK
dc.identifier.issue3en_HK
dc.identifier.spage311en_HK
dc.identifier.epage324en_HK
dc.publisher.placeJapanen_HK
dc.identifier.scopusauthoridXia, B=36112247900en_HK
dc.identifier.scopusauthoridYu, HX=7405851679en_HK
dc.identifier.scopusauthoridChen, GW=7406541455en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.scopusauthoridZhao, TP=7402268400en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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