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Article: Depositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South China
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TitleDepositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South China
 
AuthorsWang, W2
Zhou, MF2
Yan, DP1
Li, JW1
 
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
 
CitationPrecambrian Research, 2012, v. 192-195 n. 1, p. 107-124 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.precamres.2011.10.010
 
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.
 
ISSN0301-9268
2012 Impact Factor: 4.441
2012 SCImago Journal Rankings: 1.921
 
DOIhttp://dx.doi.org/10.1016/j.precamres.2011.10.010
 
ISI Accession Number IDWOS:000299979500007
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.

 
ReferencesReferences in Scopus
 
GrantsA possible linkage of the Yangtze Block (South China) in the Columbia super-continent
 
DC FieldValue
dc.contributor.authorWang, W
 
dc.contributor.authorZhou, MF
 
dc.contributor.authorYan, DP
 
dc.contributor.authorLi, JW
 
dc.date.accessioned2012-06-26T06:20:52Z
 
dc.date.available2012-06-26T06:20:52Z
 
dc.date.issued2012
 
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.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationPrecambrian Research, 2012, v. 192-195 n. 1, p. 107-124 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.precamres.2011.10.010
 
dc.identifier.citeulike9932088
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.precamres.2011.10.010
 
dc.identifier.eissn1872-7433
 
dc.identifier.epage124
 
dc.identifier.isiWOS:000299979500007
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.

 
dc.identifier.issn0301-9268
2012 Impact Factor: 4.441
2012 SCImago Journal Rankings: 1.921
 
dc.identifier.issue1
 
dc.identifier.scopuseid_2-s2.0-81055137178
 
dc.identifier.spage107
 
dc.identifier.urihttp://hdl.handle.net/10722/151342
 
dc.identifier.volume192-195
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofPrecambrian Research
 
dc.relation.projectA possible linkage of the Yangtze Block (South China) in the Columbia super-continent
 
dc.relation.referencesReferences in Scopus
 
dc.subjectDetrital Zircon
 
dc.subjectGeochemistry
 
dc.subjectNeoproterozoic
 
dc.subjectProvenance
 
dc.subjectSibao Group
 
dc.subjectSouth China
 
dc.subjectU-Pb Geochronology
 
dc.subjectYangtze Block
 
dc.titleDepositional age, provenance, and tectonic setting of the Neoproterozoic Sibao Group, southeastern Yangtze Block, South China
 
dc.typeArticle
 
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Author Affiliations
  1. China University of Geosciences
  2. The University of Hong Kong