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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
Title | Geochemical and Sm-Nd isotopic study of amphibolites in the Cathaysia Block, southeastern China: Evidence for an extremely depleted mantle in the Paleoproterozoic |
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Authors | |
Keywords | Amphibolite Cathaysia Block Depleted mantle Paleoproterozoic Sm-Nd isotopes Southeastern China |
Issue Date | 2000 |
Publisher | Elsevier 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? |
Abstract | Geochemical 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 Identifier | http://hdl.handle.net/10722/151039 |
ISSN | 2023 Impact Factor: 3.2 2023 SCImago Journal Rankings: 1.589 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Li, XH | en_HK |
dc.contributor.author | Sun, M | en_HK |
dc.contributor.author | Wei, GJ | en_HK |
dc.contributor.author | Liu, Y | en_HK |
dc.contributor.author | Lee, CY | en_HK |
dc.contributor.author | Malpas, J | en_HK |
dc.date.accessioned | 2012-06-26T06:16:24Z | - |
dc.date.available | 2012-06-26T06:16:24Z | - |
dc.date.issued | 2000 | en_HK |
dc.identifier.citation | Precambrian Research, 2000, v. 102 n. 3-4, p. 251-262 | en_HK |
dc.identifier.issn | 0301-9268 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/151039 | - |
dc.description.abstract | Geochemical 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.language | eng | en_US |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres | en_HK |
dc.relation.ispartof | Precambrian Research | en_HK |
dc.rights | Precambrian Research. Copyright © Elsevier BV. | - |
dc.subject | Amphibolite | en_HK |
dc.subject | Cathaysia Block | en_HK |
dc.subject | Depleted mantle | en_HK |
dc.subject | Paleoproterozoic | en_HK |
dc.subject | Sm-Nd isotopes | en_HK |
dc.subject | Southeastern China | en_HK |
dc.title | Geochemical and Sm-Nd isotopic study of amphibolites in the Cathaysia Block, southeastern China: Evidence for an extremely depleted mantle in the Paleoproterozoic | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Sun, M: minsun@hku.hk | en_HK |
dc.identifier.email | Malpas, J: jgmalpas@hku.hk | en_HK |
dc.identifier.authority | Sun, M=rp00780 | en_HK |
dc.identifier.authority | Malpas, J=rp00059 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/S0301-9268(00)00067-X | en_HK |
dc.identifier.scopus | eid_2-s2.0-0034130259 | en_HK |
dc.identifier.hkuros | 55681 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0034130259&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 102 | en_HK |
dc.identifier.issue | 3-4 | en_HK |
dc.identifier.spage | 251 | en_HK |
dc.identifier.epage | 262 | en_HK |
dc.identifier.isi | WOS:000087411300005 | - |
dc.publisher.place | Netherlands | en_HK |
dc.identifier.scopusauthorid | Li, XH=48961256600 | en_HK |
dc.identifier.scopusauthorid | Sun, M=25932315800 | en_HK |
dc.identifier.scopusauthorid | Wei, GJ=24330125600 | en_HK |
dc.identifier.scopusauthorid | Liu, Y=48961202900 | en_HK |
dc.identifier.scopusauthorid | Lee, CY=48961166200 | en_HK |
dc.identifier.scopusauthorid | Malpas, J=7006136845 | en_HK |
dc.customcontrol.immutable | sml 130311 | - |
dc.identifier.issnl | 0301-9268 | - |