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Article: Two magma series and associated ore deposit types in the Permian Emeishan large igneous province, SW China

TitleTwo magma series and associated ore deposit types in the Permian Emeishan large igneous province, SW China
Authors
KeywordsEmeishan Large Igneous Province
Gabbroic rocks
Mafic-ultramafic rocks
Permian
SW China
Syenite
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2008, v. 103 n. 3-4, p. 352-368 How to Cite?
AbstractThe Late Middle Permian (∼ 260 Ma) Emeishan large igneous province in SW China contains two magmatic series, one comprising high-Ti basalts and Fe-rich gabbroic and syenitic intrusions, the other low-Ti basalts and mafic-ultramafic intrusions. The Fe-rich gabbros are spatially and temporally associated with syenites. Each series is associated with a distinctive type of mineralization, the first with giant Fe-Ti-V oxide ore deposits such as Panzhihua and Baima, the second with Ni-Cu-(PGE) sulfide deposits such as Jinbaoshan, Limahe and Zhubu. New SHRIMP zircon U-Pb isotopic data yielded 263 ± 3 Ma for the Limahe intrusion, 261 ± 2 Ma for the Zhubu intrusion and 262 ± 2 Ma for a syenitic intrusion. These new age dates, together with previously reported SHRIMP zircon U-Pb ages, suggest that all these intrusions are contemporaneous with the Emeishan flood basalts and formed during a major igneous event at ca. 260 Ma. The oxide-bearing intrusions have higher Al 2O 3, FeO (as total iron) and total alkalis (Na 2O + K 2O) but lower MgO than the sulfide-bearing intrusions. All intrusions are variably enriched in LREE relative to HREE. The oxide-bearing intrusions display positive Nb- and Ti-anomalies and in certain cases negative Zr-Hf anomalies, whereas the sulfide-bearing intrusions have obvious negative Nb- and Ti-anomalies, a feature of crustal contamination. Individual intrusions have relatively small ranges of e{open}Nd(t) values. All the intrusions, however, have e{open}Nd(t) values ranging from - 3.9 to + 4.6, and initial 87Sr/ 86Sr ratios from 0.7039 to 0.7105. The syenites have very low MgO (< 2 wt.%) but highly variable Fe 2O 3 (2.5 to 13 wt.%) with initial 87Sr/ 86Sr ratios ranging from 0.7039 to 0.7089. Magmas from both series could have derived by melting of a heterogeneous mantle plume: the high-Ti series from a Fe-rich, more fertile source and the low-Ti series from a Fe-poor, more refractory source. In addition, the low-Ti series underwent significant crustal contamination. The two magma series evolved along different paths that led to distinct mineralization styles. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58657
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorArndt, NTen_HK
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorWang, CYen_HK
dc.contributor.authorKennedy, AKen_HK
dc.date.accessioned2010-05-31T03:34:30Z-
dc.date.available2010-05-31T03:34:30Z-
dc.date.issued2008en_HK
dc.identifier.citationLithos, 2008, v. 103 n. 3-4, p. 352-368en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58657-
dc.description.abstractThe Late Middle Permian (∼ 260 Ma) Emeishan large igneous province in SW China contains two magmatic series, one comprising high-Ti basalts and Fe-rich gabbroic and syenitic intrusions, the other low-Ti basalts and mafic-ultramafic intrusions. The Fe-rich gabbros are spatially and temporally associated with syenites. Each series is associated with a distinctive type of mineralization, the first with giant Fe-Ti-V oxide ore deposits such as Panzhihua and Baima, the second with Ni-Cu-(PGE) sulfide deposits such as Jinbaoshan, Limahe and Zhubu. New SHRIMP zircon U-Pb isotopic data yielded 263 ± 3 Ma for the Limahe intrusion, 261 ± 2 Ma for the Zhubu intrusion and 262 ± 2 Ma for a syenitic intrusion. These new age dates, together with previously reported SHRIMP zircon U-Pb ages, suggest that all these intrusions are contemporaneous with the Emeishan flood basalts and formed during a major igneous event at ca. 260 Ma. The oxide-bearing intrusions have higher Al 2O 3, FeO (as total iron) and total alkalis (Na 2O + K 2O) but lower MgO than the sulfide-bearing intrusions. All intrusions are variably enriched in LREE relative to HREE. The oxide-bearing intrusions display positive Nb- and Ti-anomalies and in certain cases negative Zr-Hf anomalies, whereas the sulfide-bearing intrusions have obvious negative Nb- and Ti-anomalies, a feature of crustal contamination. Individual intrusions have relatively small ranges of e{open}Nd(t) values. All the intrusions, however, have e{open}Nd(t) values ranging from - 3.9 to + 4.6, and initial 87Sr/ 86Sr ratios from 0.7039 to 0.7105. The syenites have very low MgO (< 2 wt.%) but highly variable Fe 2O 3 (2.5 to 13 wt.%) with initial 87Sr/ 86Sr ratios ranging from 0.7039 to 0.7089. Magmas from both series could have derived by melting of a heterogeneous mantle plume: the high-Ti series from a Fe-rich, more fertile source and the low-Ti series from a Fe-poor, more refractory source. In addition, the low-Ti series underwent significant crustal contamination. The two magma series evolved along different paths that led to distinct mineralization styles. © 2007 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectEmeishan Large Igneous Provinceen_HK
dc.subjectGabbroic rocksen_HK
dc.subjectMafic-ultramafic rocksen_HK
dc.subjectPermianen_HK
dc.subjectSW Chinaen_HK
dc.subjectSyeniteen_HK
dc.titleTwo magma series and associated ore deposit types in the Permian Emeishan large igneous province, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=103&issue=3-4&spage=352&epage=368&date=2008&atitle=Two+magma+series+and+associated+ore+deposit+types+in+the+Permian+Emeishan+large+igneous+province,+SW+Chinaen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2007.10.006en_HK
dc.identifier.scopuseid_2-s2.0-44449095030en_HK
dc.identifier.hkuros144272en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-44449095030&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume103en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage352en_HK
dc.identifier.epage368en_HK
dc.identifier.isiWOS:000257907700004-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridArndt, NT=7004860212en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridWang, CY=34976092700en_HK
dc.identifier.scopusauthoridKennedy, AK=7401653640en_HK

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