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Article: Genesis of the Permian Baimazhai magmatic Ni-Cu-(PGE) sulfide deposit, Yunnan, SW China

TitleGenesis of the Permian Baimazhai magmatic Ni-Cu-(PGE) sulfide deposit, Yunnan, SW China
Authors
KeywordsBaimazhai
China
Nickel sulfide mineralization
Platinum-groupelements
Sulfursaturation
Issue Date2006
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htm
Citation
Mineralium Deposita, 2006, v. 41 n. 8, p. 771-783 How to Cite?
AbstractThe ∼260 Ma-old Baimazhai Ni-Cu-(PGE) sulfide deposit in the Jinping region, Yunnan, SW China, is hosted in a small mafic-ultramafic intrusion, which intruded Ordovician sandstone and slate. The intrusion is concentric with lens shape, about 530 m long, 190 m wide and 24 to 64 m thick, trends 296°, and dips 22°NE. The massive sulfide ore body forms the core of the intrusion and is surrounded by variably mineralized orthopyroxenite, websterite and barren gabbro. The proportion of gabbro, websterite, orthopyroxenite and massive ore is approximately 30, 30, 20 and 20° vol.%, respectively. Magmatic pyrrhotite, pentlandite and chalcopyrite make up more than 90% of the massive ores. The massive ores contain high Ni (1.6 to 4.2 wt%) and Cu (0.4 to 6.5 wt%) and low ∑PGE contents (85 to 524 ppb). They have Pd/Ir ratios ranging from 6.7 to 530, Pd/Pt ratios from 0.7 to 2.6 and Cu/(Pd×1,000) ratios from 31 to 400, which are comparable with those of the silicate rocks [Pd/Ir=4 to 183, Pd/Pt=0.7 to 3.5, and Cu/ (Pd×1,000)=100 to 400]. Similar Pd/Pt and Cu/Pd ratios of the silicate rocks and massive ores throughout the intrusion indicate a single sulfide segregation event. Excess sulfide melt segregation resulted from intensive crustal contamination that formed Si-rich and Mg-rich basaltic magmas in a deep-seated staging chamber before magma emplacement. The immiscible sulfide melts and the silicate melts were eventually evacuated from the staging magma chamber by compressive forces. Flow differentiation under high velocity concentrated the sulfide melts toward the middle of the magma flow, and consequently, formed a massive sulfide ore body in the central part of the intrusion. Low concentrations of PGEs and general absence of platinum-group minerals in the massive ores may have resulted from a relatively large mass fraction of the sulfide melts (e.g. R-factor=∼70) in Baimazhai compared with other intrusions elsewhere, such as Noril'sk-Talnakh with a R-factor of >10,000. © Springer-Verlag 2006.
Persistent Identifierhttp://hdl.handle.net/10722/72700
ISSN
2015 Impact Factor: 3.467
2015 SCImago Journal Rankings: 1.677
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-09-06T06:44:17Z-
dc.date.available2010-09-06T06:44:17Z-
dc.date.issued2006en_HK
dc.identifier.citationMineralium Deposita, 2006, v. 41 n. 8, p. 771-783en_HK
dc.identifier.issn0026-4598en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72700-
dc.description.abstractThe ∼260 Ma-old Baimazhai Ni-Cu-(PGE) sulfide deposit in the Jinping region, Yunnan, SW China, is hosted in a small mafic-ultramafic intrusion, which intruded Ordovician sandstone and slate. The intrusion is concentric with lens shape, about 530 m long, 190 m wide and 24 to 64 m thick, trends 296°, and dips 22°NE. The massive sulfide ore body forms the core of the intrusion and is surrounded by variably mineralized orthopyroxenite, websterite and barren gabbro. The proportion of gabbro, websterite, orthopyroxenite and massive ore is approximately 30, 30, 20 and 20° vol.%, respectively. Magmatic pyrrhotite, pentlandite and chalcopyrite make up more than 90% of the massive ores. The massive ores contain high Ni (1.6 to 4.2 wt%) and Cu (0.4 to 6.5 wt%) and low ∑PGE contents (85 to 524 ppb). They have Pd/Ir ratios ranging from 6.7 to 530, Pd/Pt ratios from 0.7 to 2.6 and Cu/(Pd×1,000) ratios from 31 to 400, which are comparable with those of the silicate rocks [Pd/Ir=4 to 183, Pd/Pt=0.7 to 3.5, and Cu/ (Pd×1,000)=100 to 400]. Similar Pd/Pt and Cu/Pd ratios of the silicate rocks and massive ores throughout the intrusion indicate a single sulfide segregation event. Excess sulfide melt segregation resulted from intensive crustal contamination that formed Si-rich and Mg-rich basaltic magmas in a deep-seated staging chamber before magma emplacement. The immiscible sulfide melts and the silicate melts were eventually evacuated from the staging magma chamber by compressive forces. Flow differentiation under high velocity concentrated the sulfide melts toward the middle of the magma flow, and consequently, formed a massive sulfide ore body in the central part of the intrusion. Low concentrations of PGEs and general absence of platinum-group minerals in the massive ores may have resulted from a relatively large mass fraction of the sulfide melts (e.g. R-factor=∼70) in Baimazhai compared with other intrusions elsewhere, such as Noril'sk-Talnakh with a R-factor of >10,000. © Springer-Verlag 2006.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htmen_HK
dc.relation.ispartofMineralium Depositaen_HK
dc.subjectBaimazhaien_HK
dc.subjectChinaen_HK
dc.subjectNickel sulfide mineralizationen_HK
dc.subjectPlatinum-groupelementsen_HK
dc.subjectSulfursaturationen_HK
dc.titleGenesis of the Permian Baimazhai magmatic Ni-Cu-(PGE) sulfide deposit, Yunnan, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0026-4598&volume=41&issue=8&spage=771&epage=783&date=2006&atitle=Genesis+of+the+Permian+Baimazhai+magmatic+Ni-Cu-(PGE)+sulfide+deposit,+Yunnan,+SW+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.doi10.1007/s00126-006-0094-2en_HK
dc.identifier.scopuseid_2-s2.0-34447618345en_HK
dc.identifier.hkuros167293en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34447618345&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume41en_HK
dc.identifier.issue8en_HK
dc.identifier.spage771en_HK
dc.identifier.epage783en_HK
dc.identifier.isiWOS:000242327300002-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWang, CY=35849436700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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