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Article: Depositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South China

TitleDepositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South China
Authors
KeywordsDetrital Zircon
Geochemistry
Neoproterozoic
Provenance
Sibao Group
South China
U-Pb Geochronology
Yangtze Block
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2012, v. 192-195 n. 1, p. 107-124 How to Cite?
Abstract
The Sibao Group on the southeastern margin of the Yangtze Block of South China is composed mainly of flysch turbidites up to ca. 4000m thick. Sandstones from the Sibao Group have intermediate to high SiO 2 (58.6-80.0wt%, average 68.2wt%) and Al 2O 3 wt% (7.4-20.6wt%, average 15wt%), typical of immature lithic varieties. Both sandstones and mudstones contain high K 2O (1.41-6.28wt%) but extremely low Na 2O (0.03-1.49wt%). Positive correlations between Al 2O 3 and Fe 2O 3 (T), TiO 2, MgO and K 2O, significant depletion of Ca, Na and Sr relative to upper continental crust and high PIA and pre-metasomatism CIA values suggest that intensive chemical weathering of the source area. Variable Cr/Th (3.9-37.0) and Co/Th (0.2-3.2) ratios indicate a source with predominant felsic and minor mafic components. Discrimination diagrams involving Ti, Al, Fe, La, Th, Sc, Hf and Co reveal the source with multiple lithologies consisting mainly of TTG-like, granitic, andesitic and felsic volcanic rocks.Predominant detrital zircons have Neoproterozoic ages from 822 to 980Ma, whereas the remaining zircons define two age groups at 1.35-2.22Ga and 2.32-2.86Ga. Twenty-six of the youngest grains have a weighted mean age of 835.3±3.6Ma, tentatively interpreted as the maximum depositional age of the Sibao Group. Neoproterozoic zircon grains have variable 177Hf/ 176Hf ratios (0.281194 to 0.282564) and e{open} Hf(t) values (-35.9 to 9.8), indicative of the involvement of juvenile and ancient recycled components. The 1.4 and 1.8Ga zircon grains have variable 177Hf/ 176Hf ratios (0.280947-0.281874), probably reflecting the growth of the supercontinent Columbia and suggesting that the Yangtze Block was separated from Columbia as an independent terrane at around 1.4Ga. The complicated provenance involving felsic to intermediate rocks and Neoproterozoic juvenile to Neoarchean mature materials suggests that the Neoproterozoic Sibao Group was deposited in a back-arc foreland basin related to the northward (present coordinate) subduction of an oceanic lithosphere beneath the southeastern Yangtze Block. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151342
ISSN
2013 Impact Factor: 6.023
2013 SCImago Journal Rankings: 3.073
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 707210P
State Key Laboratory of Mineral Deposits200802
State Key Lab of Geological Processes and Mineral ResourcesGPMR200710
CAS/SAFEAKZCX2-YW-t004
Funding Information:

This study was supported by the Research Grant Council of Hong Kong (HKU 707210P), a project from the State Key Laboratory of Mineral Deposits (200802), an opening fund of the State Key Lab of Geological Processes and Mineral Resources (GPMR200710) and the CAS/SAFEA International Partnership Program for Creative Research Teams (KZCX2-YW-t004). We thank Jianfeng Gao, Xiao Fu, Liang Li, and Prof. Liang Qi for their assistance in the field and with the analyses. Constructive reviews by journal reviewers greatly improved this contribution.

References
Grants

 

Author Affiliations
  1. China University of Geosciences
  2. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorWang, Wen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorYan, DPen_US
dc.contributor.authorLi, JWen_US
dc.date.accessioned2012-06-26T06:20:52Z-
dc.date.available2012-06-26T06:20:52Z-
dc.date.issued2012en_US
dc.identifier.citationPrecambrian Research, 2012, v. 192-195 n. 1, p. 107-124en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151342-
dc.description.abstractThe Sibao Group on the southeastern margin of the Yangtze Block of South China is composed mainly of flysch turbidites up to ca. 4000m thick. Sandstones from the Sibao Group have intermediate to high SiO 2 (58.6-80.0wt%, average 68.2wt%) and Al 2O 3 wt% (7.4-20.6wt%, average 15wt%), typical of immature lithic varieties. Both sandstones and mudstones contain high K 2O (1.41-6.28wt%) but extremely low Na 2O (0.03-1.49wt%). Positive correlations between Al 2O 3 and Fe 2O 3 (T), TiO 2, MgO and K 2O, significant depletion of Ca, Na and Sr relative to upper continental crust and high PIA and pre-metasomatism CIA values suggest that intensive chemical weathering of the source area. Variable Cr/Th (3.9-37.0) and Co/Th (0.2-3.2) ratios indicate a source with predominant felsic and minor mafic components. Discrimination diagrams involving Ti, Al, Fe, La, Th, Sc, Hf and Co reveal the source with multiple lithologies consisting mainly of TTG-like, granitic, andesitic and felsic volcanic rocks.Predominant detrital zircons have Neoproterozoic ages from 822 to 980Ma, whereas the remaining zircons define two age groups at 1.35-2.22Ga and 2.32-2.86Ga. Twenty-six of the youngest grains have a weighted mean age of 835.3±3.6Ma, tentatively interpreted as the maximum depositional age of the Sibao Group. Neoproterozoic zircon grains have variable 177Hf/ 176Hf ratios (0.281194 to 0.282564) and e{open} Hf(t) values (-35.9 to 9.8), indicative of the involvement of juvenile and ancient recycled components. The 1.4 and 1.8Ga zircon grains have variable 177Hf/ 176Hf ratios (0.280947-0.281874), probably reflecting the growth of the supercontinent Columbia and suggesting that the Yangtze Block was separated from Columbia as an independent terrane at around 1.4Ga. The complicated provenance involving felsic to intermediate rocks and Neoproterozoic juvenile to Neoarchean mature materials suggests that the Neoproterozoic Sibao Group was deposited in a back-arc foreland basin related to the northward (present coordinate) subduction of an oceanic lithosphere beneath the southeastern Yangtze Block. © 2011 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_US
dc.relation.ispartofPrecambrian Researchen_US
dc.subjectDetrital Zirconen_US
dc.subjectGeochemistryen_US
dc.subjectNeoproterozoicen_US
dc.subjectProvenanceen_US
dc.subjectSibao Groupen_US
dc.subjectSouth Chinaen_US
dc.subjectU-Pb Geochronologyen_US
dc.subjectYangtze Blocken_US
dc.titleDepositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2011.10.010en_US
dc.identifier.scopuseid_2-s2.0-81055137178en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-81055137178&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume192-195en_US
dc.identifier.issue1en_US
dc.identifier.spage107en_US
dc.identifier.epage124en_US
dc.identifier.eissn1872-7433-
dc.identifier.isiWOS:000299979500007-
dc.publisher.placeNetherlandsen_US
dc.relation.projectA possible linkage of the Yangtze Block (South China) in the Columbia super-continent-
dc.identifier.scopusauthoridWang, W=49261283700en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridYan, DP=36683417500en_US
dc.identifier.scopusauthoridLi, JW=36067183300en_US
dc.identifier.citeulike9932088-

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