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Article: Chalcophile element geochemistry and petrogenesis of high-Ti and low-Ti magmas in the Permian Emeishan large igneous province, SW China

TitleChalcophile element geochemistry and petrogenesis of high-Ti and low-Ti magmas in the Permian Emeishan large igneous province, SW China
Authors
KeywordsFractionation of olivine and chromite
High-Ti and low-Ti mafic rocks
PGE distribution
Sulfide saturation
Issue Date2011
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm
Citation
Contributions To Mineralogy And Petrology, 2011, v. 161 n. 2, p. 237-254 How to Cite?
AbstractSulfide-poor mafic layered intrusions, sills/dykes and lava flows in the Funing region, SW China, are part of the ~260 Ma Emeishan large igneous province. They belong to either a high-Ti group (TiO2 = 1.6-4.4 wt%) with elevated Ti/Y ratios (351-1,018), or a low-Ti group (TiO2 < 1.2 wt%) with low Ti/Y ratios (133-223). This study investigates the role of fractionation of olivine, chromite and sulfide on the distributions of chalcophile elements, Ni, Cu and PGE, of the high-Ti and low-Ti group rocks at Funing. The high-Ti group rocks contain 1.6-5.3 ppb Pt + Pd, 0.06-0.43 ppb Ir and 0.01-0.13 ppb Ru, and show relative constant (Cu/Pd)PM ratios (4.0-9.7) and a negative correlation between Ni/Pd and Cu/Ir ratios. Fractionated IPGE/PPGE patterns and very negative Ru anomalies of the high-Ti group rocks, together with low Fo values (59-62 mol%) of olivine, indicate that the high-Ti magmas may have experienced fractionation of olivine and chromite under S-undersaturated condition. Based on the PGE concentrations, the low-Ti group rocks can be further divided into two subgroups; a high-PGE low-Ti subgroup and a low-PGE low-Ti subgroup. The high-PGE low-Ti group rocks are rich in MgO (10-20 wt%), but Fo values of olivine from the rocks are low (74-76 mol%). The rocks contain highly variable PGE (Pt + Pd = 1.7-88 ppb, Ir = 0.05-1.3 ppb), Ni (179 -1,380 ppm) and Cu (59-568 ppm). They have Cu/Zr ratios >1, low (Y/Pd)PM ratios (0.2-7.1) and nearly constant (Cu/Pd)PM ratios (1.5-3.8). The even and parallel chalcophile element patterns of the high-PGE low-Ti subgroup rocks are likely a result of olivine-dominated fractionation under S-undersaturated condition. The low-PGE low-Ti group rocks have low MgO (4.5-8.9 wt%) and very poor PGE (Pt + Pd 0.5-1.6 ppb, Ir 0.004-0.02 ppb) with low Cu/Zr ratios (0.1-0.5), high (Y/Pd)PM (26-70) and variable (Cu/Pd)PM ratios (2.8-14). The trough-like chalcophile element patterns of the low-PGE low-Ti subgroup rocks indicate that the magmas were sulfide saturation and sulfide melts were extracted from the magmas. The extracted sulfide melts might be potential Ni-Cu sulfide ores at depth in the Funing region. © 2010 Springer-Verlag.
Persistent Identifierhttp://hdl.handle.net/10722/139216
ISSN
2015 Impact Factor: 3.218
2015 SCImago Journal Rankings: 2.582
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National "973" project2007CB411401
HKU
Chinese Academy of SciencesKZCX2-YW-Q04-06
Funding Information:

This study was supported by a Chinese National "973" project (2007CB411401) and a matching fund from HKU to MFZ, a CAS Project No. KZCX2-YW-Q04-06 to CYW, and a "CAS Hundred Talents" project under Chinese Academy of Sciences to CYW and LQ, respectively. Critical and very constructive comments from two reviewers, Mike Lesher and an anonymous reviewer, and editor Timothy Grove are appreciated. This is contribution No. IS-1183 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorQi, Len_HK
dc.date.accessioned2011-09-23T05:47:12Z-
dc.date.available2011-09-23T05:47:12Z-
dc.date.issued2011en_HK
dc.identifier.citationContributions To Mineralogy And Petrology, 2011, v. 161 n. 2, p. 237-254en_HK
dc.identifier.issn0010-7999en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139216-
dc.description.abstractSulfide-poor mafic layered intrusions, sills/dykes and lava flows in the Funing region, SW China, are part of the ~260 Ma Emeishan large igneous province. They belong to either a high-Ti group (TiO2 = 1.6-4.4 wt%) with elevated Ti/Y ratios (351-1,018), or a low-Ti group (TiO2 < 1.2 wt%) with low Ti/Y ratios (133-223). This study investigates the role of fractionation of olivine, chromite and sulfide on the distributions of chalcophile elements, Ni, Cu and PGE, of the high-Ti and low-Ti group rocks at Funing. The high-Ti group rocks contain 1.6-5.3 ppb Pt + Pd, 0.06-0.43 ppb Ir and 0.01-0.13 ppb Ru, and show relative constant (Cu/Pd)PM ratios (4.0-9.7) and a negative correlation between Ni/Pd and Cu/Ir ratios. Fractionated IPGE/PPGE patterns and very negative Ru anomalies of the high-Ti group rocks, together with low Fo values (59-62 mol%) of olivine, indicate that the high-Ti magmas may have experienced fractionation of olivine and chromite under S-undersaturated condition. Based on the PGE concentrations, the low-Ti group rocks can be further divided into two subgroups; a high-PGE low-Ti subgroup and a low-PGE low-Ti subgroup. The high-PGE low-Ti group rocks are rich in MgO (10-20 wt%), but Fo values of olivine from the rocks are low (74-76 mol%). The rocks contain highly variable PGE (Pt + Pd = 1.7-88 ppb, Ir = 0.05-1.3 ppb), Ni (179 -1,380 ppm) and Cu (59-568 ppm). They have Cu/Zr ratios >1, low (Y/Pd)PM ratios (0.2-7.1) and nearly constant (Cu/Pd)PM ratios (1.5-3.8). The even and parallel chalcophile element patterns of the high-PGE low-Ti subgroup rocks are likely a result of olivine-dominated fractionation under S-undersaturated condition. The low-PGE low-Ti group rocks have low MgO (4.5-8.9 wt%) and very poor PGE (Pt + Pd 0.5-1.6 ppb, Ir 0.004-0.02 ppb) with low Cu/Zr ratios (0.1-0.5), high (Y/Pd)PM (26-70) and variable (Cu/Pd)PM ratios (2.8-14). The trough-like chalcophile element patterns of the low-PGE low-Ti subgroup rocks indicate that the magmas were sulfide saturation and sulfide melts were extracted from the magmas. The extracted sulfide melts might be potential Ni-Cu sulfide ores at depth in the Funing region. © 2010 Springer-Verlag.en_HK
dc.languageengen_US
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htmen_HK
dc.relation.ispartofContributions to Mineralogy and Petrologyen_HK
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectFractionation of olivine and chromiteen_HK
dc.subjectHigh-Ti and low-Ti mafic rocksen_HK
dc.subjectPGE distributionen_HK
dc.subjectSulfide saturationen_HK
dc.titleChalcophile element geochemistry and petrogenesis of high-Ti and low-Ti magmas in the Permian 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.doi10.1007/s00410-010-0529-8en_HK
dc.identifier.scopuseid_2-s2.0-78651235338en_HK
dc.identifier.hkuros195323en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78651235338&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume161en_HK
dc.identifier.issue2en_HK
dc.identifier.spage237en_HK
dc.identifier.epage254en_HK
dc.identifier.isiWOS:000286117300005-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWang, CY=35849436700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.citeulike7116916-

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