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Article: OIB-like, heterogeneous mantle sources of Permian basaltic magmatism in the western Tarim Basin, NW China: Implications for a possible Permian large igneous province

TitleOIB-like, heterogeneous mantle sources of Permian basaltic magmatism in the western Tarim Basin, NW China: Implications for a possible Permian large igneous province
Authors
KeywordsGeochemistry
Heterogeneous mantle source
Large igneous province
Permian basalt
Tarim Basin
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 113 n. 3-4, p. 583-594 How to Cite?
AbstractPermian basalts are widely distributed in the Tarim Basin and surrounding areas of NW China. The magmatism is represented by basaltic flows in Keping and mafic and ultramafic dykes in Silurian-Devonian strata in Bachu, southwestern Tarim Basin. The basalts in Keping have SiO 2 (44.1%-55.5 wt.%) and total alkalis (Na 2O + K 2O = 3.20-7.79 wt.%) similar to the mafic dykes in Bachu, but with much higher TiO 2 (3.53-4.33 wt.%). An ultramafic dyke has relatively low SiO 2 (44.6-43.2 wt.%) and high MgO (19.0-20.2 wt.%), reflecting the abundance of cumulate olivine. All the rocks, including both lavas and dykes, have parallel, mantle-normalized trace element patterns enriched in Rb, Ba, Th, Nb, Ta, Zr, Hf, and light rare earth elements (LREE). The basalts have higher initial 87Sr/ 86Sr ratios (0.7064 to 0.7080) and lower εNd(t) values (- 2.66 to - 9.27) than the dykes (initial 87Sr/ 86Sr ratios range from 0.7048 to 0.7052 and εNd(t) values from + 1.64 to + 5.16). Both the basalts and dykes show a narrow range of 206Pb/ 204Pb (17.87-18.77), 207Pb/ 204Pb (15.52-15.58) and 208Pb/ 204Pb (38.38-39.04) ratios. The dykes do not show significant crustal contamination and were derived from an OIB-like, asthenospheric mantle source. In contrast, the basaltic flows show variable degrees (up to 10%) of crustal contamination and were derived from an OIB-like, but isotopically more enriched, asthenospheric mantle source. Olivine from the ultramafic dyke has Fo values up to 85, corresponding to a melt temperature of 1300 °C and a melt Mg# of 63. The Tarim Basin magmatism reflects partial melting of heterogeneous mantle sources related to a major mantle plume. Spatially and temporally associated mafic-ultramafic and syenitic intrusions and volcanic rocks form the ~ 275 Ma Tarim large igneous province. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/129171
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU7058/08P
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, CAS200802
CVRD-INCO
HKU
Funding Information:

This work was supported by a grant from the Research Grant Council of Hong Kong (HKU7058/08P), a project from the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, CAS (200802), a CVRD-INCO research grant and a Chinese 973 Project matching grant from HKU (to MFZ). Field work in 2007 was assisted by the local geological teams of Xinjiang and Yang Yang. We are sincerely thankful to Peter C. Lightfoot for his support over the years and for initiating this research project and to Paul T. Robinson for his great help during the preparation of this paper. Official reviews by Franco Pirajno and Marc Reichow and editorial handling by Andrew Kerr are gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorJiang, CYen_HK
dc.contributor.authorGao, JFen_HK
dc.contributor.authorWang, Wen_HK
dc.contributor.authorYang, SHen_HK
dc.date.accessioned2010-12-23T08:33:15Z-
dc.date.available2010-12-23T08:33:15Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 113 n. 3-4, p. 583-594en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129171-
dc.description.abstractPermian basalts are widely distributed in the Tarim Basin and surrounding areas of NW China. The magmatism is represented by basaltic flows in Keping and mafic and ultramafic dykes in Silurian-Devonian strata in Bachu, southwestern Tarim Basin. The basalts in Keping have SiO 2 (44.1%-55.5 wt.%) and total alkalis (Na 2O + K 2O = 3.20-7.79 wt.%) similar to the mafic dykes in Bachu, but with much higher TiO 2 (3.53-4.33 wt.%). An ultramafic dyke has relatively low SiO 2 (44.6-43.2 wt.%) and high MgO (19.0-20.2 wt.%), reflecting the abundance of cumulate olivine. All the rocks, including both lavas and dykes, have parallel, mantle-normalized trace element patterns enriched in Rb, Ba, Th, Nb, Ta, Zr, Hf, and light rare earth elements (LREE). The basalts have higher initial 87Sr/ 86Sr ratios (0.7064 to 0.7080) and lower εNd(t) values (- 2.66 to - 9.27) than the dykes (initial 87Sr/ 86Sr ratios range from 0.7048 to 0.7052 and εNd(t) values from + 1.64 to + 5.16). Both the basalts and dykes show a narrow range of 206Pb/ 204Pb (17.87-18.77), 207Pb/ 204Pb (15.52-15.58) and 208Pb/ 204Pb (38.38-39.04) ratios. The dykes do not show significant crustal contamination and were derived from an OIB-like, asthenospheric mantle source. In contrast, the basaltic flows show variable degrees (up to 10%) of crustal contamination and were derived from an OIB-like, but isotopically more enriched, asthenospheric mantle source. Olivine from the ultramafic dyke has Fo values up to 85, corresponding to a melt temperature of 1300 °C and a melt Mg# of 63. The Tarim Basin magmatism reflects partial melting of heterogeneous mantle sources related to a major mantle plume. Spatially and temporally associated mafic-ultramafic and syenitic intrusions and volcanic rocks form the ~ 275 Ma Tarim large igneous province. © 2009 Elsevier B.V. All rights reserved.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.subjectGeochemistryen_HK
dc.subjectHeterogeneous mantle sourceen_HK
dc.subjectLarge igneous provinceen_HK
dc.subjectPermian basalten_HK
dc.subjectTarim Basinen_HK
dc.titleOIB-like, heterogeneous mantle sources of Permian basaltic magmatism in the western Tarim Basin, NW China: Implications for a possible Permian large igneous provinceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=113&issue=3-4&spage=583&epage=594&date=2009&atitle=OIB-like,+heterogeneous+mantle+sources+of+Permian+basaltic+magmatism+in+the+western+Tarim+Basin,+NW+China:+Implications+for+a+possible+Permian+large+igneous+province-
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.2009.06.027en_HK
dc.identifier.scopuseid_2-s2.0-70449521307en_HK
dc.identifier.hkuros177699en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449521307&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume113en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage583en_HK
dc.identifier.epage594en_HK
dc.identifier.isiWOS:000272787200016-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, JH=49061691300en_HK
dc.identifier.scopusauthoridJiang, CY=22961947100en_HK
dc.identifier.scopusauthoridGao, JF=25638167000en_HK
dc.identifier.scopusauthoridWang, W=36072896000en_HK
dc.identifier.scopusauthoridYang, SH=49261330000en_HK
dc.identifier.citeulike5331959-

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