File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Siderophile and chalcophile elemental constraints on the origin of the Jinchuan Ni-Cu-(PGE) sulfide deposit, NW China

TitleSiderophile and chalcophile elemental constraints on the origin of the Jinchuan Ni-Cu-(PGE) sulfide deposit, NW China
Authors
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gca
Citation
Geochimica Et Cosmochimica Acta, 2009, v. 73 n. 2, p. 404-424 How to Cite?
AbstractThe Jinchuan deposit, NW China, is one of the world's most important Ni-Cu-(PGE) sulfide deposits related to a magma conduit system and is hosted in an ultramafic intrusion. The intrusion is composed of lherzolite and dunite with the two largest sulfide ore bodies (named as ore body 1 and 2) in its middle portion. The sulfide ores may be disseminated, net-textured, or massive. The disseminated and net-textured sulfide ores are characterized by variable but generally low PGE concentrations: 10-3200 ppb Pt, 240-9800 ppb Pd, 17-800 ppb Ir, 25-1500 ppb Ru, and 15-400 ppb Rh in 100% sulfides. The massive sulfide ores are extremely low in Pt (<30 ppb) on a 100% sulfides and have very high Cu/Pd ratios, ranging from 10 4 to 4.5 × 10 5. The low PGE contents suggest that the sulfide ores formed from the silicate magmas that had already experienced prior-sulfide separation. Our calculations indicate that if the first stage basaltic magmas had contained 6.3 ppb Pt, 6.2 ppb Pd, and 0.1 ppb Ir, 0.008% sulfide removal would result in PGE-depletion in the residual magma with 0.57 ppb Pt, 0.25 ppb Pd, and 0.009 ppb Ir. The Jinchuan sulfides were formed by a second stage of sulfide segregation from a PGE-depleted magma under silicate/sulfide liquid ratios (R-factor) ranging from 10 3 to 10 4 in a deep-seated staging chamber. The massive sulfide ores and some of the net-textured sulfide ores exhibit strong negative Pt-anomalies that cannot be explained by sulfide segregation under variable R-factors. Instead, the sulfide melts that formed the massive ores were segregated from magmas experienced prior fractionation of Pt-Fe alloy. Alternatively, the Pt may have been selectively leached by hydrothermal fluids during remobilization of the sulfide melts that produced the massive sulfides, which occur in cross-cutting veins. We propose that the Jinchuan intrusion and ore bodies were formed by injections of sulfide-free and sulfide-bearing olivine mushes from a deep-seated staging chamber. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58702
ISSN
2015 Impact Factor: 4.315
2015 SCImago Journal Rankings: 3.016
ISI Accession Number ID
Funding AgencyGrant Number
Chinese Academy of SciencesNSFC 40573014
40730420
University of Hong Kong
Funding Information:

This study was supported by research grants from China (NSFC 40573014, 40730420, and "CAS Hundred Talents" Project from Chinese Academy of Sciences to X.-Y. Song) and a CRCG grant from the University of Hong Kong to M-F Zhou. Many thanks are due to Dr. Y.-L. Tian. Mr. Y.-S. Wang, D.-H. Ba, F.G. Qiao, Y.-C. Ren, J.-P. Jiang. and S.-L. Zheng for their generous logistical support during the fieldwork. We are grateful to Professors C.M. Lesher and Nick Arndt for their thorough reviews that helped improve the paper and Professor E.W. Ripley for efficient editorial handling.

References

 

DC FieldValueLanguage
dc.contributor.authorSong, XYen_HK
dc.contributor.authorKeays, RRen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorQi, Len_HK
dc.contributor.authorIhlenfeld, Cen_HK
dc.contributor.authorXiao, JFen_HK
dc.date.accessioned2010-05-31T03:35:17Z-
dc.date.available2010-05-31T03:35:17Z-
dc.date.issued2009en_HK
dc.identifier.citationGeochimica Et Cosmochimica Acta, 2009, v. 73 n. 2, p. 404-424en_HK
dc.identifier.issn0016-7037en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58702-
dc.description.abstractThe Jinchuan deposit, NW China, is one of the world's most important Ni-Cu-(PGE) sulfide deposits related to a magma conduit system and is hosted in an ultramafic intrusion. The intrusion is composed of lherzolite and dunite with the two largest sulfide ore bodies (named as ore body 1 and 2) in its middle portion. The sulfide ores may be disseminated, net-textured, or massive. The disseminated and net-textured sulfide ores are characterized by variable but generally low PGE concentrations: 10-3200 ppb Pt, 240-9800 ppb Pd, 17-800 ppb Ir, 25-1500 ppb Ru, and 15-400 ppb Rh in 100% sulfides. The massive sulfide ores are extremely low in Pt (<30 ppb) on a 100% sulfides and have very high Cu/Pd ratios, ranging from 10 4 to 4.5 × 10 5. The low PGE contents suggest that the sulfide ores formed from the silicate magmas that had already experienced prior-sulfide separation. Our calculations indicate that if the first stage basaltic magmas had contained 6.3 ppb Pt, 6.2 ppb Pd, and 0.1 ppb Ir, 0.008% sulfide removal would result in PGE-depletion in the residual magma with 0.57 ppb Pt, 0.25 ppb Pd, and 0.009 ppb Ir. The Jinchuan sulfides were formed by a second stage of sulfide segregation from a PGE-depleted magma under silicate/sulfide liquid ratios (R-factor) ranging from 10 3 to 10 4 in a deep-seated staging chamber. The massive sulfide ores and some of the net-textured sulfide ores exhibit strong negative Pt-anomalies that cannot be explained by sulfide segregation under variable R-factors. Instead, the sulfide melts that formed the massive ores were segregated from magmas experienced prior fractionation of Pt-Fe alloy. Alternatively, the Pt may have been selectively leached by hydrothermal fluids during remobilization of the sulfide melts that produced the massive sulfides, which occur in cross-cutting veins. We propose that the Jinchuan intrusion and ore bodies were formed by injections of sulfide-free and sulfide-bearing olivine mushes from a deep-seated staging chamber. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/gcaen_HK
dc.relation.ispartofGeochimica et Cosmochimica Actaen_HK
dc.titleSiderophile and chalcophile elemental constraints on the origin of the Jinchuan Ni-Cu-(PGE) sulfide deposit, NW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-7037&volume=73&issue=2&spage=404&epage=424&date=2009&atitle=Siderophile+and+chalcophile+elemental+constraints+on+the+origin+of+the+Jinchuan+Ni-Cu-(PGE)+sulfide+deposit,+NW+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.doi10.1016/j.gca.2008.10.029en_HK
dc.identifier.scopuseid_2-s2.0-57749168356en_HK
dc.identifier.hkuros167319en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-57749168356&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume73en_HK
dc.identifier.issue2en_HK
dc.identifier.spage404en_HK
dc.identifier.epage424en_HK
dc.identifier.isiWOS:000262251300011-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridSong, XY=7402269092en_HK
dc.identifier.scopusauthoridKeays, RR=7005122208en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.scopusauthoridIhlenfeld, C=25823806700en_HK
dc.identifier.scopusauthoridXiao, JF=7402564566en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats