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Article: Geochemical and Sm-Nd isotopic study of amphibolites in the Cathaysia Block, southeastern China: Evidence for an extremely depleted mantle in the Paleoproterozoic

TitleGeochemical and Sm-Nd isotopic study of amphibolites in the Cathaysia Block, southeastern China: Evidence for an extremely depleted mantle in the Paleoproterozoic
Authors
KeywordsAmphibolite
Cathaysia Block
Depleted mantle
Paleoproterozoic
Sm-Nd isotopes
Southeastern China
Issue Date2000
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2000, v. 102 n. 3-4, p. 251-262 How to Cite?
AbstractGeochemical and Sm-Nd isotopic results are reported for late Paleoproterozoic mafic amphibolites from SW Zhejiang and NW Fujian, parts of the Cathaysia Block of SE China. Two suites of contemporaneous amphibolites are distinct in their geochemical characteristics. Group 1 samples, from NW Fujian, have chemical compositions of transitional and alkali basalts, show LREE-enriched patterns and plot mainly in the field of within-plate basalt on a number of trace element discrimination diagrams. Group 2 rocks, from SW Zhejiang, have tholeiitic compositions and are characterized by flat to LREE-depleted patterns and fall into the MORB field. All the amphibolite samples have high εNd(T) values of + 5.6 to + 8.5 (T = 1766 ± 19 Ma). A positive correlation between εNd(T) and Nb/Th suggests possible mixing of a mantle-derived magma and a crustal component, with the least-contaminated samples having very high εNd(T) values (+ 8 ~ + 8.5) and Nb/Th ratios of ~ 13. The geochemical and isotopic characters and close temporal relationship of these two suites of amphibolites suggest that their magmatic precursors were likely formed in an environment similar to an ensialic rift developing into a proto-oceanic basin (e.g. the Gulf of Tadjoura). The exceptionally high εNd(T) values of up to + 8.5 for some of the amphibolites suggest the presence of a time-integrated extremely depleted mantle source beneath Cathaysia during the Paleoproterozic. (C) 2000 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151039
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XHen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorWei, GJen_HK
dc.contributor.authorLiu, Yen_HK
dc.contributor.authorLee, CYen_HK
dc.contributor.authorMalpas, Jen_HK
dc.date.accessioned2012-06-26T06:16:24Z-
dc.date.available2012-06-26T06:16:24Z-
dc.date.issued2000en_HK
dc.identifier.citationPrecambrian Research, 2000, v. 102 n. 3-4, p. 251-262en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151039-
dc.description.abstractGeochemical and Sm-Nd isotopic results are reported for late Paleoproterozoic mafic amphibolites from SW Zhejiang and NW Fujian, parts of the Cathaysia Block of SE China. Two suites of contemporaneous amphibolites are distinct in their geochemical characteristics. Group 1 samples, from NW Fujian, have chemical compositions of transitional and alkali basalts, show LREE-enriched patterns and plot mainly in the field of within-plate basalt on a number of trace element discrimination diagrams. Group 2 rocks, from SW Zhejiang, have tholeiitic compositions and are characterized by flat to LREE-depleted patterns and fall into the MORB field. All the amphibolite samples have high εNd(T) values of + 5.6 to + 8.5 (T = 1766 ± 19 Ma). A positive correlation between εNd(T) and Nb/Th suggests possible mixing of a mantle-derived magma and a crustal component, with the least-contaminated samples having very high εNd(T) values (+ 8 ~ + 8.5) and Nb/Th ratios of ~ 13. The geochemical and isotopic characters and close temporal relationship of these two suites of amphibolites suggest that their magmatic precursors were likely formed in an environment similar to an ensialic rift developing into a proto-oceanic basin (e.g. the Gulf of Tadjoura). The exceptionally high εNd(T) values of up to + 8.5 for some of the amphibolites suggest the presence of a time-integrated extremely depleted mantle source beneath Cathaysia during the Paleoproterozic. (C) 2000 Elsevier Science 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/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.rightsPrecambrian Research. Copyright © Elsevier BV.-
dc.subjectAmphiboliteen_HK
dc.subjectCathaysia Blocken_HK
dc.subjectDepleted mantleen_HK
dc.subjectPaleoproterozoicen_HK
dc.subjectSm-Nd isotopesen_HK
dc.subjectSoutheastern Chinaen_HK
dc.titleGeochemical and Sm-Nd isotopic study of amphibolites in the Cathaysia Block, southeastern China: Evidence for an extremely depleted mantle in the Paleoproterozoicen_HK
dc.typeArticleen_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0301-9268(00)00067-Xen_HK
dc.identifier.scopuseid_2-s2.0-0034130259en_HK
dc.identifier.hkuros55681-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034130259&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume102en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage251en_HK
dc.identifier.epage262en_HK
dc.identifier.isiWOS:000087411300005-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, XH=48961256600en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridWei, GJ=24330125600en_HK
dc.identifier.scopusauthoridLiu, Y=48961202900en_HK
dc.identifier.scopusauthoridLee, CY=48961166200en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.customcontrol.immutablesml 130311-

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