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Article: U-Pb and Hf isotopic study of detrital zircons from the meta-sedimentary rocks in central Jiangxi Province, South China: Implications for the Neoproterozoic tectonic evolution of South China Block

TitleU-Pb and Hf isotopic study of detrital zircons from the meta-sedimentary rocks in central Jiangxi Province, South China: Implications for the Neoproterozoic tectonic evolution of South China Block
Authors
KeywordsCathaysia Block
Garnet-mica schist
Hf isotope
Neoproterozoic
Zircon geochronology
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2011, v. 41 n. 1, p. 44-55 How to Cite?
AbstractThe Zhoutan Group, made of meta-sedimentary rocks and mafic volcanic, outcrops at the western margin of the Cathaysia Block. These rocks have been previously considered to represent a Mesoproterozoic sequence. However, this study shows that the ages of detrital zircons from the garnet-mica schists of this group are predominantly Neoproterozoic (1.0-0.82Ga), and the youngest detrital zircon grains clearly constrain that the maximum depositional age of the meta-sedimentary sequence (i.e. the Zhoutan Group) is ca. 826Ma. Subordinate detrital zircons give Paleo- to Mesoproterozoic (1.9-1.4Ga) ages and minor zircons yield Neoarchaean (~2.5Ga) ages. Because 1.0-0.82Ga old rocks are common at the southeastern margin of the Yangtze Block, while the 1.9-1.4Ga rocks occur in the northwestern Fujian and southeastern Zhejiang Provinces, Cathaysia Block, our data suggest that these Neoproterozoic sediments may be derived both from the Yangtze Block and the Cathaysia Block. We proposed that these sediments deposited in a small remnant ocean between the passive margin of the Cathaysia Block and the active margin of the Yangtze Block, thus the timing of the final assembly between the Yangtze and the Cathaysia Block was after 826Ma. Paleoproterozoic detrital zircons mostly have negative εHf values, suggesting that much of the Paleoproterozoic crust in South China came from reworked Archean crust. Detrital zircons with oscillatory growth zoning in the 1.0-0.82Ga age population have approximately the same proportion of positive and negative εHf values ranging from +17.8 to -27.3. This favors the growth of a significant volume of juvenile crust in the Neoproterozoic time in South China, possibly caused by the subduction before the assembly between the Yangtze and the Cathaysia Block. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139179
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grant CouncilHKU 7041/05
HKU
Guangzhou Institute of Geochemistry, CAS
Chinese Ministry of Land and Resources200811015
Funding Information:

The authors appreciate the assistance of X.P. Xia for LA-ICP-MS U-Pb analysis and M.N. Dai and F.F. Zhang for Hf analysis. J.F. Gao and S.H. Yang are thanked for their helpful discussion and Y.Z. Zhang and K.D. Cai for help in the field. We thank Prof. L.S. Shu and an anonymous reviewer for their comments that help the improvement of the paper. This study was financially supported by research grants from the Hong Kong Research Grant Council (HKU 7041/05), the Croucher Funding for the Joint Laboratory between HKU and Guangzhou Institute of Geochemistry, CAS and the Chinese Ministry of Land and Resources (200811015). A HKU postgraduate studentship to Longming Li is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, LMen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorXing, Gen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorHe, Yen_HK
dc.contributor.authorHe, Ken_HK
dc.contributor.authorZhang, Aen_HK
dc.date.accessioned2011-09-23T05:46:23Z-
dc.date.available2011-09-23T05:46:23Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2011, v. 41 n. 1, p. 44-55en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139179-
dc.description.abstractThe Zhoutan Group, made of meta-sedimentary rocks and mafic volcanic, outcrops at the western margin of the Cathaysia Block. These rocks have been previously considered to represent a Mesoproterozoic sequence. However, this study shows that the ages of detrital zircons from the garnet-mica schists of this group are predominantly Neoproterozoic (1.0-0.82Ga), and the youngest detrital zircon grains clearly constrain that the maximum depositional age of the meta-sedimentary sequence (i.e. the Zhoutan Group) is ca. 826Ma. Subordinate detrital zircons give Paleo- to Mesoproterozoic (1.9-1.4Ga) ages and minor zircons yield Neoarchaean (~2.5Ga) ages. Because 1.0-0.82Ga old rocks are common at the southeastern margin of the Yangtze Block, while the 1.9-1.4Ga rocks occur in the northwestern Fujian and southeastern Zhejiang Provinces, Cathaysia Block, our data suggest that these Neoproterozoic sediments may be derived both from the Yangtze Block and the Cathaysia Block. We proposed that these sediments deposited in a small remnant ocean between the passive margin of the Cathaysia Block and the active margin of the Yangtze Block, thus the timing of the final assembly between the Yangtze and the Cathaysia Block was after 826Ma. Paleoproterozoic detrital zircons mostly have negative εHf values, suggesting that much of the Paleoproterozoic crust in South China came from reworked Archean crust. Detrital zircons with oscillatory growth zoning in the 1.0-0.82Ga age population have approximately the same proportion of positive and negative εHf values ranging from +17.8 to -27.3. This favors the growth of a significant volume of juvenile crust in the Neoproterozoic time in South China, possibly caused by the subduction before the assembly between the Yangtze and the Cathaysia Block. © 2010 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.subjectCathaysia Blocken_HK
dc.subjectGarnet-mica schisten_HK
dc.subjectHf isotopeen_HK
dc.subjectNeoproterozoicen_HK
dc.subjectZircon geochronologyen_HK
dc.titleU-Pb and Hf isotopic study of detrital zircons from the meta-sedimentary rocks in central Jiangxi Province, South China: Implications for the Neoproterozoic tectonic evolution of South China Blocken_HK
dc.typeArticleen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2010.12.004en_HK
dc.identifier.scopuseid_2-s2.0-79952617252en_HK
dc.identifier.hkuros193901en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952617252&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume41en_HK
dc.identifier.issue1en_HK
dc.identifier.spage44en_HK
dc.identifier.epage55en_HK
dc.identifier.isiWOS:000289542200003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, LM=49963916100en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridWang, Y=36496272800en_HK
dc.identifier.scopusauthoridXing, G=7103115605en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridHe, Y=8678944900en_HK
dc.identifier.scopusauthoridHe, K=49963413600en_HK
dc.identifier.scopusauthoridZhang, A=7402772951en_HK
dc.identifier.citeulike8677290-

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