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Article: Keketuohai mafic-ultramafic complex in the Chinese Altai, NW China: petrogenesis and geodynamic significance

TitleKeketuohai mafic-ultramafic complex in the Chinese Altai, NW China: petrogenesis and geodynamic significance
Authors
KeywordsCaob
Chinese altai
Mafic-ultramafic complex
Petrogenesis
Ridge subduction
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2012, v. 294-295, p. 26-41 How to Cite?
AbstractDevonian magmatism was very intensive in the tectonic evolutionary history of the Chinese Altai, a key part of the Central Asian Orogenic Belt (CAOB). The Devonian Keketuohai mafic-ultramafic complex in the Chinese Altai is a zoned intrusion consisting of dunite, olivine gabbro, hornblende gabbro and pyroxene diorite. The pyroxene diorite gives a zircon U-Pb age of 409±5Ma. Variations in mineral assemblage and chemical composition suggest that the petrogenesis of the Keketuohai Complex was chiefly governed by fractional crystallization from a common magma chamber. Low SiO 2, K 2O and Na 2O contents, negative covariations between P 2O 5, TiO 2 and Mg# value suggest insignificant crustal assimilation/contamination. Thus the positive ε Nd(t) values (0 to +2.7) and slight enrichments in light rare earth elements (e.g., La/Yb N=0.98-3.64) suggest that their parental magma was possibly produced by partial melting of the lithospheric mantle. Model calculation suggests that their parental magma was high-Mg (Mg#=66) tholeiitic basaltic melt. The Keketuohai intrusion was coeval with diverse magmatism, high temperature metamorphism and hydrothermal mineralization, which support a previously proposed model that ridge subduction most likely played an important role in the tectonic evolution of the Chinese Altai. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151352
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU704307P
HKU705311P
National Natural Science Foundation of China40721063
40772130
40803009
HKU CRCG
Hong Kong-Germany Joint Research Scheme
Funding Information:

This study was supported by the National Basic Research Program of China (2007CB411308), Hong Kong Research Grants Council (HKU704307P and HKU705311P), the National Natural Science Foundation of China (40721063, 40772130 and 40803009), the HKU CRCG Research Grants and Hong Kong-Germany Joint Research Scheme. We thank Ying Liu, Guangqian, Hu, Jinlong Ma, Xianglin Tu and Xirong Liang for laboratory assistance. Dr. Michail Buslov and an anonymous reviewer are thanked for their constructive reviews and comments. We sincerely appreciate Dr. Klaus Mezger for his helpful comments and editorial work. A HKU postgraduate studentship to Keda CAI is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorCai, Ken_US
dc.contributor.authorSun, Men_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorXiao, Wen_US
dc.contributor.authorLong, Xen_US
dc.date.accessioned2012-06-26T06:21:01Z-
dc.date.available2012-06-26T06:21:01Z-
dc.date.issued2012en_US
dc.identifier.citationChemical Geology, 2012, v. 294-295, p. 26-41en_US
dc.identifier.issn0009-2541en_US
dc.identifier.urihttp://hdl.handle.net/10722/151352-
dc.description.abstractDevonian magmatism was very intensive in the tectonic evolutionary history of the Chinese Altai, a key part of the Central Asian Orogenic Belt (CAOB). The Devonian Keketuohai mafic-ultramafic complex in the Chinese Altai is a zoned intrusion consisting of dunite, olivine gabbro, hornblende gabbro and pyroxene diorite. The pyroxene diorite gives a zircon U-Pb age of 409±5Ma. Variations in mineral assemblage and chemical composition suggest that the petrogenesis of the Keketuohai Complex was chiefly governed by fractional crystallization from a common magma chamber. Low SiO 2, K 2O and Na 2O contents, negative covariations between P 2O 5, TiO 2 and Mg# value suggest insignificant crustal assimilation/contamination. Thus the positive ε Nd(t) values (0 to +2.7) and slight enrichments in light rare earth elements (e.g., La/Yb N=0.98-3.64) suggest that their parental magma was possibly produced by partial melting of the lithospheric mantle. Model calculation suggests that their parental magma was high-Mg (Mg#=66) tholeiitic basaltic melt. The Keketuohai intrusion was coeval with diverse magmatism, high temperature metamorphism and hydrothermal mineralization, which support a previously proposed model that ridge subduction most likely played an important role in the tectonic evolution of the Chinese Altai. © 2011 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_US
dc.relation.ispartofChemical Geologyen_US
dc.subjectCaoben_US
dc.subjectChinese altaien_US
dc.subjectMafic-ultramafic complexen_US
dc.subjectPetrogenesisen_US
dc.subjectRidge subductionen_US
dc.titleKeketuohai mafic-ultramafic complex in the Chinese Altai, NW China: petrogenesis and geodynamic significanceen_US
dc.typeArticleen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.chemgeo.2011.11.031en_US
dc.identifier.scopuseid_2-s2.0-84155173544en_US
dc.identifier.hkuros204298-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84155173544&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume294-295en_US
dc.identifier.spage26en_US
dc.identifier.epage41en_US
dc.identifier.eissn1872-6836-
dc.identifier.isiWOS:000304213800003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLong, X=14012199100en_US
dc.identifier.scopusauthoridXiao, W=7202456615en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridCai, K=14011943800en_US
dc.identifier.citeulike10119645-

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