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Article: Geochemical and geochronological studies of the Alegedayi Ophiolitic Complex and its implication for the evolution of the Chinese Altai

TitleGeochemical and geochronological studies of the Alegedayi Ophiolitic Complex and its implication for the evolution of the Chinese Altai
Authors
KeywordsAccretion
Altai
Central Asian Orogenic Belt
Geochemistry
Geochronology
Ophiolitic complex
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2010, v. 18 n. 2-3, p. 438-454 How to Cite?
AbstractThe Alegedayi Ophiolitic Complex (AOC) was discovered in the northwestern part of Altai, Xinjiang, China. Strips of mafic rocks including gabbro, diabase, pillow basalt and pyroxenite, all deformed, mostly underwent low-grade metamorphism, are intercalated with marine-facies sedimentary strata consisting of shale, siltstone and chert. SHRIMP zircon dating of a metagabbro sample gave an age of 439±17. Ma. In terms of whole-rock geochemistry, the AOC is composed of three distinct groups. Whereas the majority has transitional or enriched mid-ocean ridge basalt (T-/E-MORB) affinity, varieties with oceanic island basalt (OIB) and supra-subduction zone (SSZ) affinities were also identified. Our data show that the petrogenesis of this mafic complex involved interaction among depleted mantle, enriched component, recycled sediments, slab-derived fluid, and metasomatized mantle wedge. Taking into account the coeval adakites and high-Mg rocks to the southwest and a slightly older arc to the northeast, we suggest that the AOC reflects an intra-arc spreading event that occurred in response to an early Silurian ridge subduction which had profound effects on the tectonic evolution of the Chinese Altai. © 2010 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/139193
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong RGCHKU7043/07P
National Basic Research Program of China2007CB411308
GAES of GermanyG-HK030/07
Funding Information:

This study was supported by Hong Kong RGC grants (HKU7043/07P), National Basic Research Program of China (2007CB411308), German/Hong Kong Joint Research Scheme sponsored by RGC of Hong Kong and GAES of Germany (G-HK030/07). We thank Yildirim Dilek, Hugh Rollinson, Alfred Kroner, Brian Windley, Bor-Ming Jahn and Kent Condie for their invaluable comments.

References

 

DC FieldValueLanguage
dc.contributor.authorWong, Ken_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorXiao, Wen_HK
dc.date.accessioned2011-09-23T05:46:31Z-
dc.date.available2011-09-23T05:46:31Z-
dc.date.issued2010en_HK
dc.identifier.citationGondwana Research, 2010, v. 18 n. 2-3, p. 438-454en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/139193-
dc.description.abstractThe Alegedayi Ophiolitic Complex (AOC) was discovered in the northwestern part of Altai, Xinjiang, China. Strips of mafic rocks including gabbro, diabase, pillow basalt and pyroxenite, all deformed, mostly underwent low-grade metamorphism, are intercalated with marine-facies sedimentary strata consisting of shale, siltstone and chert. SHRIMP zircon dating of a metagabbro sample gave an age of 439±17. Ma. In terms of whole-rock geochemistry, the AOC is composed of three distinct groups. Whereas the majority has transitional or enriched mid-ocean ridge basalt (T-/E-MORB) affinity, varieties with oceanic island basalt (OIB) and supra-subduction zone (SSZ) affinities were also identified. Our data show that the petrogenesis of this mafic complex involved interaction among depleted mantle, enriched component, recycled sediments, slab-derived fluid, and metasomatized mantle wedge. Taking into account the coeval adakites and high-Mg rocks to the southwest and a slightly older arc to the northeast, we suggest that the AOC reflects an intra-arc spreading event that occurred in response to an early Silurian ridge subduction which had profound effects on the tectonic evolution of the Chinese Altai. © 2010 International Association for Gondwana Research.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.subjectAccretionen_HK
dc.subjectAltaien_HK
dc.subjectCentral Asian Orogenic Belten_HK
dc.subjectGeochemistryen_HK
dc.subjectGeochronologyen_HK
dc.subjectOphiolitic complexen_HK
dc.titleGeochemical and geochronological studies of the Alegedayi Ophiolitic Complex and its implication for the evolution of the Chinese Altaien_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1342-937X&volume=18&issue=2-3&spage=438&epage=454&date=2010&atitle=Geochemical+and+geochronological+studies+of+the+Alegedayi+Ophiolitic+Complex+and+its+implication+for+the+evolution+of+the+Chinese+Altai-
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2010.01.010en_HK
dc.identifier.scopuseid_2-s2.0-77954957896en_HK
dc.identifier.hkuros193926en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77954957896&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume18en_HK
dc.identifier.issue2-3en_HK
dc.identifier.spage438en_HK
dc.identifier.epage454en_HK
dc.identifier.isiWOS:000280672000011-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWong, K=34769228100en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK

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