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Article: In-situ U-Pb, Hf and Re-Os isotopic analyses of the Xiangshan Ni-Cu-Co deposit in Eastern Tianshan (Xinjiang), Central Asia Orogenic Belt: Constraints on the timing and genesis of the mineralization

TitleIn-situ U-Pb, Hf and Re-Os isotopic analyses of the Xiangshan Ni-Cu-Co deposit in Eastern Tianshan (Xinjiang), Central Asia Orogenic Belt: Constraints on the timing and genesis of the mineralization
Authors
KeywordsRe-Os isotopic data
U-Pb geochronology
Xiangshan intrusion
Zircon
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2010, v. 120 n. 3-4, p. 547-562 How to Cite?
AbstractThe timing and genesis of the major Ni-Cu-Co sulfide deposit in the Xiangshan intrusion have been studied based on newly obtained in-situ U-Pb, Hf and Re-Os isotopic analyses. The SIMS U-Pb zircon ages of the gabbro hosting the Ni-Cu-Co sulfide deposit indicate that the Xiangshan intrusion was emplaced at 279.6 ± 1.1. Ma (95% confidence level, MSWD = 1.30, n= 15). On the basis of combined geological and geochronological evidence, we suggest that the Xiangshan and other adjacent Ni-Cu deposits were formed in the same period. Sulphides have low common Os concentrations and high Re/Os ratios, similar to sulphide ores from the Duluth, Sally Malay and Voisey Bay complexes. The Re-Os isotopic data from the disseminated and massive ores from the Xiangshan intrusion do not form a single isochron, as they have different initial Os ratios. The Hf and Os isotopic data suggest that the Xiangshan intrusion and associated Ni-Cu-Co mineralization were derived from crustally contaminated mantle melts. The geochemical data show a tholeiitic affinity and a strong suprasubduction zone signature with negative Nb, Sr, and Ti anomalies similar to N-MORB and E-MORB. We suggest that the mafic-ultramafic rocks and associated Ni-Cu mineralization of the Eastern Tianshan orogen formed in an Alaska-type subduction zone-arc setting. Some diagnostic features of ridge-trench interaction are present in the Chinese East Tianshan orogen (e.g. granites, adakites, high-Mg andesites, near-trench magmatism, Alaskan-type mafic-ultramafic complexes, high-temperature metamorphic belts that prograde rapidly from low-grade belts, and orogenic gold deposits). The above distinctive rock groups are probably related to the same thermal event, ridge subduction, as in the Cenozoic orogen of Alaska. We suggest that ridge subduction is the most plausible mechanism to provide the necessary heat. Ridge subduction provides an important promising model for understanding many aspects of the evolution of the Chinese Eastern Tianshan orogen, and by inference, throughout much of Central Asia. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139194
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Chinese Academy of SciencesKZCX2-YW-107
Chinese State 973 Project2007CB411307
State 305 Project2007BA25B04
NSFC40725009
40421303
40973036
40572043
Hong Kong RGC7066/07P
Funding Information:

We are indebted to Xianhua Li Jingwen Mao Bin Cut Kezhang Qin Lianchang Zhang Tianlin Ma Zongyao Rut Zhiliang Wang and Jianming Yang for thoughtful discussions Many of the ideas in this paper were initiated and rectified during these discussions We are grateful to T M Kusky and B F Windley for their constructive discussions and comments on an early version of the manuscript which led to substantial improvements on the paper Two anonymous reviewers and the Editor Nelson Eby are thanked for their constructive reviews which significantly improved the manuscript This study was financially supported by funds from the Innovative Program of the Chinese Academy of Sciences (KZCX2-YW-107) the Chinese State 973 Project (2007CB411307) State 305 Project (2007BA25B04) the NSFC Project (40725009 40421303 40973036 and 40572043) and Hong Kong RGC (7066/07P) This paper is a contribution to the ILP (ERAS) and IGCP 480

References

 

DC FieldValueLanguage
dc.contributor.authorHan, Cen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorAo, Sen_HK
dc.contributor.authorZhang, Jen_HK
dc.contributor.authorQu, Wen_HK
dc.contributor.authorDu, Aen_HK
dc.date.accessioned2011-09-23T05:46:31Z-
dc.date.available2011-09-23T05:46:31Z-
dc.date.issued2010en_HK
dc.identifier.citationLithos, 2010, v. 120 n. 3-4, p. 547-562en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139194-
dc.description.abstractThe timing and genesis of the major Ni-Cu-Co sulfide deposit in the Xiangshan intrusion have been studied based on newly obtained in-situ U-Pb, Hf and Re-Os isotopic analyses. The SIMS U-Pb zircon ages of the gabbro hosting the Ni-Cu-Co sulfide deposit indicate that the Xiangshan intrusion was emplaced at 279.6 ± 1.1. Ma (95% confidence level, MSWD = 1.30, n= 15). On the basis of combined geological and geochronological evidence, we suggest that the Xiangshan and other adjacent Ni-Cu deposits were formed in the same period. Sulphides have low common Os concentrations and high Re/Os ratios, similar to sulphide ores from the Duluth, Sally Malay and Voisey Bay complexes. The Re-Os isotopic data from the disseminated and massive ores from the Xiangshan intrusion do not form a single isochron, as they have different initial Os ratios. The Hf and Os isotopic data suggest that the Xiangshan intrusion and associated Ni-Cu-Co mineralization were derived from crustally contaminated mantle melts. The geochemical data show a tholeiitic affinity and a strong suprasubduction zone signature with negative Nb, Sr, and Ti anomalies similar to N-MORB and E-MORB. We suggest that the mafic-ultramafic rocks and associated Ni-Cu mineralization of the Eastern Tianshan orogen formed in an Alaska-type subduction zone-arc setting. Some diagnostic features of ridge-trench interaction are present in the Chinese East Tianshan orogen (e.g. granites, adakites, high-Mg andesites, near-trench magmatism, Alaskan-type mafic-ultramafic complexes, high-temperature metamorphic belts that prograde rapidly from low-grade belts, and orogenic gold deposits). The above distinctive rock groups are probably related to the same thermal event, ridge subduction, as in the Cenozoic orogen of Alaska. We suggest that ridge subduction is the most plausible mechanism to provide the necessary heat. Ridge subduction provides an important promising model for understanding many aspects of the evolution of the Chinese Eastern Tianshan orogen, and by inference, throughout much of Central Asia. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectRe-Os isotopic dataen_HK
dc.subjectU-Pb geochronologyen_HK
dc.subjectXiangshan intrusionen_HK
dc.subjectZirconen_HK
dc.titleIn-situ U-Pb, Hf and Re-Os isotopic analyses of the Xiangshan Ni-Cu-Co deposit in Eastern Tianshan (Xinjiang), Central Asia Orogenic Belt: Constraints on the timing and genesis of the mineralizationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=120&issue=3-4&spage=547&epage=562&date=2010&atitle=In-situ+U-Pb,+Hf+and+Re-Os+isotopic+analyses+of+the+Xiangshan+Ni-Cu-Co+deposit+in+Eastern+Tianshan+(Xinjiang),+Central+Asia+Orogenic+Belt:+Constraints+on+the+timing+and+genesis+of+the+mineralization-
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2010.09.019en_HK
dc.identifier.scopuseid_2-s2.0-78649442568en_HK
dc.identifier.hkuros193927en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649442568&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume120en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage547en_HK
dc.identifier.epage562en_HK
dc.identifier.isiWOS:000285706600019-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridHan, C=35794513200en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridAo, S=14010187500en_HK
dc.identifier.scopusauthoridZhang, J=14009581400en_HK
dc.identifier.scopusauthoridQu, W=8982620500en_HK
dc.identifier.scopusauthoridDu, A=35829586200en_HK
dc.identifier.citeulike7971648-

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