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Article: Platinum-group elemental and Sr-Nd-Os isotopic geochemistry of Permian Emeishan flood basalts in Guizhou Province, SW China

TitlePlatinum-group elemental and Sr-Nd-Os isotopic geochemistry of Permian Emeishan flood basalts in Guizhou Province, SW China
Authors
KeywordsBasalts
Emeishan continental flood basalts
PGE
Re-Os isotopes
SW China
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2008, v. 248 n. 1-2, p. 83-103 How to Cite?
AbstractThe 260 Ma Emeishan continental flood basalts (ECFB) occur in SW China and northern Vietnam. A 550-m-thick sequence of ECFB in Guizhou Province (SW China) is composed of 12 basaltic lava flows, each ranging from 10 to 140 m in thickness. All samples belong to the high-Ti basalts (TiO 2 = 1.9-4.4 wt.% and Ti/Y = 400-700). Relative to the upper flows (Flows 9-12), those from the lower part of the section (Flows 1-8) are depleted in Nb, Ta, P and Sr and enriched in Zr, La and Th, consistent with higher degree of crustal contamination. Overall, the concentrations of Os, Ir and Ru range from 0.01 to 0.23 ppb and are low relative to those of Rh, Pt and Pd, which range from 0.2 to 1.1, 6 to 17 and 5 to 18 ppb, respectively. Different lava flows have different primitive mantle-normalized PGE patterns, and samples from the same flow show similar patterns. Fractionations between PPGE and IPGE are mainly controlled by olivine and chromite fractionation. The negative correlations between Pd/Ir and Pt/Pd, and Ni/Pd and Pd/Cr are consistent with crystal fractionation. Flows 6-8 and 10-12 show obvious negative Ru anomalies, explained by fractionation of laurite (Ru, Os, Ir)S 2 or Os-Ir-Ru alloys in the primary magma, or by coprecipitation of laurite with chromite or olivine. Flows 9-12 are Os-poor and have higher initial 187Os/ 188Os ratios than Flows 1-8, indicating it is easy to alter the Os isotopic compositions of basaltic magmas with lower Os concentrations. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72930
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorQi, Len_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-09-06T06:46:27Z-
dc.date.available2010-09-06T06:46:27Z-
dc.date.issued2008en_HK
dc.identifier.citationChemical Geology, 2008, v. 248 n. 1-2, p. 83-103en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72930-
dc.description.abstractThe 260 Ma Emeishan continental flood basalts (ECFB) occur in SW China and northern Vietnam. A 550-m-thick sequence of ECFB in Guizhou Province (SW China) is composed of 12 basaltic lava flows, each ranging from 10 to 140 m in thickness. All samples belong to the high-Ti basalts (TiO 2 = 1.9-4.4 wt.% and Ti/Y = 400-700). Relative to the upper flows (Flows 9-12), those from the lower part of the section (Flows 1-8) are depleted in Nb, Ta, P and Sr and enriched in Zr, La and Th, consistent with higher degree of crustal contamination. Overall, the concentrations of Os, Ir and Ru range from 0.01 to 0.23 ppb and are low relative to those of Rh, Pt and Pd, which range from 0.2 to 1.1, 6 to 17 and 5 to 18 ppb, respectively. Different lava flows have different primitive mantle-normalized PGE patterns, and samples from the same flow show similar patterns. Fractionations between PPGE and IPGE are mainly controlled by olivine and chromite fractionation. The negative correlations between Pd/Ir and Pt/Pd, and Ni/Pd and Pd/Cr are consistent with crystal fractionation. Flows 6-8 and 10-12 show obvious negative Ru anomalies, explained by fractionation of laurite (Ru, Os, Ir)S 2 or Os-Ir-Ru alloys in the primary magma, or by coprecipitation of laurite with chromite or olivine. Flows 9-12 are Os-poor and have higher initial 187Os/ 188Os ratios than Flows 1-8, indicating it is easy to alter the Os isotopic compositions of basaltic magmas with lower Os concentrations. © 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/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.rightsChemical Geology . Copyright © Elsevier BV.en_HK
dc.subjectBasaltsen_HK
dc.subjectEmeishan continental flood basaltsen_HK
dc.subjectPGEen_HK
dc.subjectRe-Os isotopesen_HK
dc.subjectSW Chinaen_HK
dc.titlePlatinum-group elemental and Sr-Nd-Os isotopic geochemistry of Permian Emeishan flood basalts in Guizhou Province, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=248&spage=83–103&epage=&date=2008&atitle=Platinum-group+elemental+and+Sr-Nd-Os+isotopic+geochemistry+of+Permian+Emeishan+flood+basalts+in+Guizhou+Province,+SW+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.doi10.1016/j.chemgeo.2007.11.004en_HK
dc.identifier.scopuseid_2-s2.0-38649089459en_HK
dc.identifier.hkuros144295en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-38649089459&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume248en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage83en_HK
dc.identifier.epage103en_HK
dc.identifier.isiWOS:000253801500005-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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