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Article: Role of crustal contamination in formation of the Jinchuan intrusion and its world-class Ni-Cu-(PGE) sulfide deposit, northwest China

TitleRole of crustal contamination in formation of the Jinchuan intrusion and its world-class Ni-Cu-(PGE) sulfide deposit, northwest China
Authors
Issue Date2006
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2006, v. 48 n. 12, p. 1113-1132 How to Cite?
AbstractThe Jinchuan ultramafic body on the southwestern margin of the North China craton hosts a giant Ni-Cu-(PGE) deposit. This dike-like intrusion consists mainly of lherzolite, dunite, and minor pyroxenite. Fortly-seven vol% of the intrusion is composed of disseminated sulfide ore and minor massive and net-textured ores. Ore bodies occur commonly in the lower part of the intrusion; the largest contains about 50% of the total metallic resources in Jinchuan, and has a "flame-like" shape in vertical cross-section. The ultramafic rocks have high MgO (19-45 wt%), low CaO (<6.5 wt%) and Al2O3 (<7 wt%), and right-inclined chondrite-normalized REE patterns. These rocks contain variable Ir (0.4-17 ppb), Ru (0.6-21 ppb), Rh (0.05-8.4 ppb), Pt (0.6-196 ppb), and Pd (1.2-135 ppb), in general lower than those in the sulfide ores (2.9-110 ppb Ir, 3.3-260 ppb Ru, 1.5-237 ppb Rh, 6.9-3972 ppb Pt, and 15-532 ppb Pd). They have high Th/Nb (0.15-0.5) ratios and show primitive mantle-normalized trace element patterns with Nb-Ta negative anomalies, consistent with derivation from mantle magmas variably contaminated by crustal materials. Compositional heterogeneity of the disseminated sulfides cannot be accounted for by in-situ fractional crystallization, but is consistent with differentiation and sulfide segregation in a staging magma chamber at depth. We propose a compressive tectonic model in which injection of sulfide-poor, crystal-rich magmas from the upper part of the staging magma chamber was followed by injection of a sulfide-rich crystal-mush from the lower part of the staging magma chamber to form the Jinchuan body. Copyright © 2006 by V. H. Winston & Son, Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72421
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSong, XYen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorWang, CYen_HK
dc.contributor.authorQi, Len_HK
dc.contributor.authorZhang, CJen_HK
dc.date.accessioned2010-09-06T06:41:38Z-
dc.date.available2010-09-06T06:41:38Z-
dc.date.issued2006en_HK
dc.identifier.citationInternational Geology Review, 2006, v. 48 n. 12, p. 1113-1132en_HK
dc.identifier.issn0020-6814en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72421-
dc.description.abstractThe Jinchuan ultramafic body on the southwestern margin of the North China craton hosts a giant Ni-Cu-(PGE) deposit. This dike-like intrusion consists mainly of lherzolite, dunite, and minor pyroxenite. Fortly-seven vol% of the intrusion is composed of disseminated sulfide ore and minor massive and net-textured ores. Ore bodies occur commonly in the lower part of the intrusion; the largest contains about 50% of the total metallic resources in Jinchuan, and has a "flame-like" shape in vertical cross-section. The ultramafic rocks have high MgO (19-45 wt%), low CaO (<6.5 wt%) and Al2O3 (<7 wt%), and right-inclined chondrite-normalized REE patterns. These rocks contain variable Ir (0.4-17 ppb), Ru (0.6-21 ppb), Rh (0.05-8.4 ppb), Pt (0.6-196 ppb), and Pd (1.2-135 ppb), in general lower than those in the sulfide ores (2.9-110 ppb Ir, 3.3-260 ppb Ru, 1.5-237 ppb Rh, 6.9-3972 ppb Pt, and 15-532 ppb Pd). They have high Th/Nb (0.15-0.5) ratios and show primitive mantle-normalized trace element patterns with Nb-Ta negative anomalies, consistent with derivation from mantle magmas variably contaminated by crustal materials. Compositional heterogeneity of the disseminated sulfides cannot be accounted for by in-situ fractional crystallization, but is consistent with differentiation and sulfide segregation in a staging magma chamber at depth. We propose a compressive tectonic model in which injection of sulfide-poor, crystal-rich magmas from the upper part of the staging magma chamber was followed by injection of a sulfide-rich crystal-mush from the lower part of the staging magma chamber to form the Jinchuan body. Copyright © 2006 by V. H. Winston & Son, Inc. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_HK
dc.relation.ispartofInternational Geology Reviewen_HK
dc.titleRole of crustal contamination in formation of the Jinchuan intrusion and its world-class Ni-Cu-(PGE) sulfide deposit, northwest Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0020-6814&volume=48&issue=12&spage=1113&epage=1132&date=2006&atitle=Role+of+crustal+contamination+in+formation+of+the+Jinchuan+intrusion+and+its+world-class+Ni-Cu-(PGE)+sulfide+deposit,+northwest+Chinaen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2747/0020-6814.48.12.1113en_HK
dc.identifier.scopuseid_2-s2.0-33845762872en_HK
dc.identifier.hkuros167292en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33845762872&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume48en_HK
dc.identifier.issue12en_HK
dc.identifier.spage1113en_HK
dc.identifier.epage1132en_HK
dc.identifier.isiWOS:000242519700004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridSong, XY=7402269092en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridWang, CY=34976092700en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.scopusauthoridZhang, CJ=7405496025en_HK

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