File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Origin of extremely PGE-rich mafic magma system: An example from the Jinbaoshan ultramafic sill, Emeishan large igneous province, SW China

TitleOrigin of extremely PGE-rich mafic magma system: An example from the Jinbaoshan ultramafic sill, Emeishan large igneous province, SW China
Authors
KeywordsPGE-rich horizons
Platinum-group elements (PGE)
Sulfide saturation
SW China
The Jinbaoshan sill
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2010, v. 119 n. 1-2, p. 147-161 How to Cite?
AbstractThe ~ 260. Ma Jinbaoshan sill is part of the Permian Emeishan large igneous province in SW China and is mainly composed of wehrlite and hosts a PGE deposit containing ~ 45 tonnes of Pt and Pd with ore grades ranging from 1 to 5 ppm Pt. + Pd. The sill is composed of several PGE-rich horizons at different stratigraphic heights. A ~ 5 m-thick PGE-rich horizon at the base of the sill, which is underlain by a chromite-rich, PGE-poor layer, accounts for 44% of the total ore reserve. The Jinbaoshan sill is rich in PGEs with Ir ranging from 1.7 to 138 ppb, Ru from 0.9 to 39 ppb, Rh from 3.1 to 133 ppb, and a total Pt and Pd from 76 to 5371 ppb. All the rocks from the sill display primitive mantle-normalized chacophile element patterns enriched in PGEs relative to Ni and Cu. The low Cu/Pd ratios (20 to 1938) of the rocks relative to the primitive mantle (Cu/Pd. = 7000) imply that there was no sulfide fractionation of the magmas. The PGE enrichment of the sill indicates that it formed from extremely PGE-rich magmas. Modeling results show that such PGE-rich magmas likely resulted from a multistage-dissolution upgrading process in an open magma conduit system. Large amounts of chromite crystallization triggered sulfide saturation when PGE-rich magmas emplaced into the upper magma chamber of the system. Settling and sorting of chromite and most sulfide liquids along with olivine resulted in the formation of the largest PGE-rich horizon at the base of the sill. The rest minor sulfide liquid accumulated to form PGE-rich horizons in the middle part of the sill aided by turbulence and convection within the magma chamber. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139220
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
CASKZCX2-YW-Q04-06
Chinese Academy of Sciences
CAS/SAFEAKZCX2-YW-t004
HKU
Funding Information:

This study was supported by a CAS Project No. KZCX2-YW-Q04-06 to CYW, the Hundred Talent Program of the Chinese Academy of Sciences to CYW and LQ the CAS/SAFEA International Partnership Program for Creative Research Teams (KZCX2-YW-t004) and a Chinese 973 project matching grant from HKU. Zongyong Zhang and Jingdong Qi from Yunbao Mining Company at jinbaoshan are thanked for providing great assistance during the field work at Jinbaoshan. Critical and very constructive comments from three reviewers, Wolfgang Maier, Sarah-Jean Barnes and an anonymous reviewer, are appreciated. This is contribution No. IS-1222 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorQi, Len_HK
dc.date.accessioned2011-09-23T05:47:14Z-
dc.date.available2011-09-23T05:47:14Z-
dc.date.issued2010en_HK
dc.identifier.citationLithos, 2010, v. 119 n. 1-2, p. 147-161en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139220-
dc.description.abstractThe ~ 260. Ma Jinbaoshan sill is part of the Permian Emeishan large igneous province in SW China and is mainly composed of wehrlite and hosts a PGE deposit containing ~ 45 tonnes of Pt and Pd with ore grades ranging from 1 to 5 ppm Pt. + Pd. The sill is composed of several PGE-rich horizons at different stratigraphic heights. A ~ 5 m-thick PGE-rich horizon at the base of the sill, which is underlain by a chromite-rich, PGE-poor layer, accounts for 44% of the total ore reserve. The Jinbaoshan sill is rich in PGEs with Ir ranging from 1.7 to 138 ppb, Ru from 0.9 to 39 ppb, Rh from 3.1 to 133 ppb, and a total Pt and Pd from 76 to 5371 ppb. All the rocks from the sill display primitive mantle-normalized chacophile element patterns enriched in PGEs relative to Ni and Cu. The low Cu/Pd ratios (20 to 1938) of the rocks relative to the primitive mantle (Cu/Pd. = 7000) imply that there was no sulfide fractionation of the magmas. The PGE enrichment of the sill indicates that it formed from extremely PGE-rich magmas. Modeling results show that such PGE-rich magmas likely resulted from a multistage-dissolution upgrading process in an open magma conduit system. Large amounts of chromite crystallization triggered sulfide saturation when PGE-rich magmas emplaced into the upper magma chamber of the system. Settling and sorting of chromite and most sulfide liquids along with olivine resulted in the formation of the largest PGE-rich horizon at the base of the sill. The rest minor sulfide liquid accumulated to form PGE-rich horizons in the middle part of the sill aided by turbulence and convection within the magma chamber. © 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.subjectPGE-rich horizonsen_HK
dc.subjectPlatinum-group elements (PGE)en_HK
dc.subjectSulfide saturationen_HK
dc.subjectSW Chinaen_HK
dc.subjectThe Jinbaoshan sillen_HK
dc.titleOrigin of extremely PGE-rich mafic magma system: An example from the Jinbaoshan ultramafic sill, Emeishan large igneous province, SW Chinaen_HK
dc.typeArticleen_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.lithos.2010.07.022en_HK
dc.identifier.scopuseid_2-s2.0-77956471739en_HK
dc.identifier.hkuros195327en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77956471739&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume119en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage147en_HK
dc.identifier.epage161en_HK
dc.identifier.isiWOS:000283015800014-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, CY=34976092700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.citeulike7581935-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats