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Article: Field relationships and geochemical constraints on the emplacement of the Jinchuan intrusion and its Ni-Cu-PGE sulfide deposit, Gansu, China

TitleField relationships and geochemical constraints on the emplacement of the Jinchuan intrusion and its Ni-Cu-PGE sulfide deposit, Gansu, China
Authors
Issue Date2007
PublisherSociety of Economic Geologists, Inc.. The Journal's web site is located at http://www.segweb.org/publications/journal.aspx
Citation
Economic Geology, 2007, v. 102 n. 1, p. 75-94 How to Cite?
AbstractField mapping and petrological-geochemical investigation of the Jinchuan intrusion in north-central China clarifies how the intrusion was emplaced and provides a new model that explains how its large and rich Ni-Cu-platinoid deposits may have formed. The intrusion was emplaced into high-grade gneisses and marbles along a disconformity at the base of an overlying cover sequence, indicating that it was emplaced as a sill, not a near-vertical dike, as previously proposed. After emplacement the intrusion was rotated to its present orientation and deformed and metamorphosed under greenschist-facies conditions. Relative enrichment of incompatible trace elements coupled with negative U-Th and Nb-Ta anomalies in all samples from the intrusion provide evidence that the parental magma assimilated granitoid rocks in the lower crust. The presence of abundant marble xenoliths, now decarbonatized to diopside-rich skarns, and chemical indices such as high CaO/SiO 2, indicate that the magma assimilated carbonate on reaching its present site. This contamination may be linked to the formation of the Ni-Cu platinoid ores. We propose that the assimilation of carbonate-rich fluids increased the oxygen fugacity of the magma and led to the segregation of metal-rich sulfides. © 2007 Society of Economic Geologists, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/72753
ISSN
2015 Impact Factor: 2.487
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLehmann, Jen_HK
dc.contributor.authorArndt, Nen_HK
dc.contributor.authorWindley, Ben_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorWang, CYen_HK
dc.contributor.authorHarris, Cen_HK
dc.date.accessioned2010-09-06T06:44:47Z-
dc.date.available2010-09-06T06:44:47Z-
dc.date.issued2007en_HK
dc.identifier.citationEconomic Geology, 2007, v. 102 n. 1, p. 75-94en_HK
dc.identifier.issn0361-0128en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72753-
dc.description.abstractField mapping and petrological-geochemical investigation of the Jinchuan intrusion in north-central China clarifies how the intrusion was emplaced and provides a new model that explains how its large and rich Ni-Cu-platinoid deposits may have formed. The intrusion was emplaced into high-grade gneisses and marbles along a disconformity at the base of an overlying cover sequence, indicating that it was emplaced as a sill, not a near-vertical dike, as previously proposed. After emplacement the intrusion was rotated to its present orientation and deformed and metamorphosed under greenschist-facies conditions. Relative enrichment of incompatible trace elements coupled with negative U-Th and Nb-Ta anomalies in all samples from the intrusion provide evidence that the parental magma assimilated granitoid rocks in the lower crust. The presence of abundant marble xenoliths, now decarbonatized to diopside-rich skarns, and chemical indices such as high CaO/SiO 2, indicate that the magma assimilated carbonate on reaching its present site. This contamination may be linked to the formation of the Ni-Cu platinoid ores. We propose that the assimilation of carbonate-rich fluids increased the oxygen fugacity of the magma and led to the segregation of metal-rich sulfides. © 2007 Society of Economic Geologists, Inc.en_HK
dc.languageengen_HK
dc.publisherSociety of Economic Geologists, Inc.. The Journal's web site is located at http://www.segweb.org/publications/journal.aspxen_HK
dc.relation.ispartofEconomic Geologyen_HK
dc.titleField relationships and geochemical constraints on the emplacement of the Jinchuan intrusion and its Ni-Cu-PGE sulfide deposit, Gansu, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0361-0128&volume=102&spage=75&epage=94&date=2007&atitle=Field+Relationships+and+Geochemical+Constraints+on+the+Emplacement+of+the+Jinchuan+Intrusion+and+its+Ni-Cu-PGE+Sulfide+Deposit,+Gansu,+China.en_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2113/gsecongeo.102.1.75en_HK
dc.identifier.scopuseid_2-s2.0-34447313367en_HK
dc.identifier.hkuros144256en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34447313367&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume102en_HK
dc.identifier.issue1en_HK
dc.identifier.spage75en_HK
dc.identifier.epage94en_HK
dc.identifier.isiWOS:000246718600004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLehmann, J=7202265562en_HK
dc.identifier.scopusauthoridArndt, N=7004860212en_HK
dc.identifier.scopusauthoridWindley, B=7006726637en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridWang, CY=34976092700en_HK
dc.identifier.scopusauthoridHarris, C=7403875337en_HK

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