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Article: Provenance and tectonic setting of the Neoproterozoic Yanbian Group, western Yangtze Block (SW China)

TitleProvenance and tectonic setting of the Neoproterozoic Yanbian Group, western Yangtze Block (SW China)
Authors
KeywordsDetrital zircon dating
Provenance
Sandstone geochemistry
Turbidite
Yanbian Group
Yangtze Block
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2008, v. 167 n. 1-2, p. 213-236 How to Cite?
AbstractTectonic evolution of the Yangtze Block of South China during Neoproterozoic time has been a major focus of debate and is important in the reconstruction of the Rodinian supercontinent. The Yanbian Group in the western margin of the Yangtze Block is a well-preserved Neoproterozoic volcanic-sedimentary sequence and provides a rare opportunity to examine the provenance and tectonic setting. It consists of a lower part composed of ∼1500 m thick basaltic lavas and an upper part of ∼3500 m thick flysch deposits. The flysch sequence contains typical deep marine turbidites consisting mainly of fine-grained volcaniclastic sandstones and mudstones, indicating a submarine fan depositional system. Detrital zircon dating yields ages ranging from ca. 865 Ma to 1000 Ma with two peaks at ca. 900 Ma and 920 Ma, respectively. The Yanbian Group is intruded by the ∼860 Ma Guandaoshan dioritic pluton, constraining its depositional age at ca. 870 Ma. The sandstones contain abundant feldspar and lithic fragments with minor amounts of quartz and have an average composition of Q 16F 35L 49, suggesting a proximal source and an undissected to transitional arc setting. The lithic fragments in the sandstones point to andesitic and felsic volcanic rock sources. The sandstones and mudstones have intermediate SiO 2/Al 2O 3 (typically 3-6), high Fe 2O 3 + MgO contents (5-12 wt%), and moderate to high K 2O/Na 2O ratios (generally 0.1-1 and 1-10 for sandstones and mudstones, respectively). In comparison with average upper continental crust, they show strong negative Nb-Ta anomalies, slight depletion of Zr-Hf, La and Th, but moderate enrichment of V, Cr, Ni, and Sc. These rocks show LREE enrichment (La/Yb N = 5.3-7.4) with flat HREE, and pronounced negative Eu anomalies (Eu/Eu * = 0.6-0.74) in chondrite-normalized REE patterns, similar to post-Archean shales. Geochemical data for these rocks suggest an arc setting and intermediate-felsic volcanic source, consistent with a back-arc basin scenario for the basaltic lavas in the lower Yanbian Group. Together with regional geological evidence, the turbidites of the Yanbian Group strongly support a model in which the western margin of the Yangtze Block was a major magmatic arc, active probably from ∼920 Ma to 740 Ma, a period of more than 180 million years. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58670
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
Funding AgencyGrant Number
National Science Foundation of China40672037/D0204
Chinese Education Ministry 111 projectB07011
International Innovation Partnership Program of CAS SAFEA
Funding Information:

This study constitutes a portion of W.H. Sun's Ph.D thesis at the University of Hong Kong. This work was financially supported by the National Science Foundation of China (NSFC grant 40672037/D0204), Chinese Education Ministry 111 project (No. B07011) and the International Innovation Partnership Program of CAS & SAFEA. We thank Xiao Fu, Jianfeng Gao, Shijian Bi and Jiangman Zhang for help with the analyses. Paul Robinson is thanked for reading this manuscript. We appreciate thorough reviews by Barry P. Roser, Keith A.W. Crook and Peter A. Cawood, whose insights led to substantial improvements in this paper.

References

 

DC FieldValueLanguage
dc.contributor.authorSun, WHen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorYan, DPen_HK
dc.contributor.authorLi, JWen_HK
dc.contributor.authorMa, YXen_HK
dc.date.accessioned2010-05-31T03:34:45Z-
dc.date.available2010-05-31T03:34:45Z-
dc.date.issued2008en_HK
dc.identifier.citationPrecambrian Research, 2008, v. 167 n. 1-2, p. 213-236en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58670-
dc.description.abstractTectonic evolution of the Yangtze Block of South China during Neoproterozoic time has been a major focus of debate and is important in the reconstruction of the Rodinian supercontinent. The Yanbian Group in the western margin of the Yangtze Block is a well-preserved Neoproterozoic volcanic-sedimentary sequence and provides a rare opportunity to examine the provenance and tectonic setting. It consists of a lower part composed of ∼1500 m thick basaltic lavas and an upper part of ∼3500 m thick flysch deposits. The flysch sequence contains typical deep marine turbidites consisting mainly of fine-grained volcaniclastic sandstones and mudstones, indicating a submarine fan depositional system. Detrital zircon dating yields ages ranging from ca. 865 Ma to 1000 Ma with two peaks at ca. 900 Ma and 920 Ma, respectively. The Yanbian Group is intruded by the ∼860 Ma Guandaoshan dioritic pluton, constraining its depositional age at ca. 870 Ma. The sandstones contain abundant feldspar and lithic fragments with minor amounts of quartz and have an average composition of Q 16F 35L 49, suggesting a proximal source and an undissected to transitional arc setting. The lithic fragments in the sandstones point to andesitic and felsic volcanic rock sources. The sandstones and mudstones have intermediate SiO 2/Al 2O 3 (typically 3-6), high Fe 2O 3 + MgO contents (5-12 wt%), and moderate to high K 2O/Na 2O ratios (generally 0.1-1 and 1-10 for sandstones and mudstones, respectively). In comparison with average upper continental crust, they show strong negative Nb-Ta anomalies, slight depletion of Zr-Hf, La and Th, but moderate enrichment of V, Cr, Ni, and Sc. These rocks show LREE enrichment (La/Yb N = 5.3-7.4) with flat HREE, and pronounced negative Eu anomalies (Eu/Eu * = 0.6-0.74) in chondrite-normalized REE patterns, similar to post-Archean shales. Geochemical data for these rocks suggest an arc setting and intermediate-felsic volcanic source, consistent with a back-arc basin scenario for the basaltic lavas in the lower Yanbian Group. Together with regional geological evidence, the turbidites of the Yanbian Group strongly support a model in which the western margin of the Yangtze Block was a major magmatic arc, active probably from ∼920 Ma to 740 Ma, a period of more than 180 million years. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDetrital zircon datingen_HK
dc.subjectProvenanceen_HK
dc.subjectSandstone geochemistryen_HK
dc.subjectTurbiditeen_HK
dc.subjectYanbian Groupen_HK
dc.subjectYangtze Blocken_HK
dc.titleProvenance and tectonic setting of the Neoproterozoic Yanbian Group, western Yangtze Block (SW China)en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0301-9268&volume=167&issue=1-2&spage=213&epage=236&date=2008&atitle=Provenance+and+tectonic+setting+of+the+Neoproterozoic+Yanbian+Group,+western+Yangtze+Block+(SW+China)en_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.precamres.2008.08.001en_HK
dc.identifier.scopuseid_2-s2.0-54249127724en_HK
dc.identifier.hkuros167315en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-54249127724&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume167en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage213en_HK
dc.identifier.epage236en_HK
dc.identifier.isiWOS:000261552100012-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridSun, WH=7404011340en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridLi, JW=36067183300en_HK
dc.identifier.scopusauthoridMa, YX=49261135000en_HK

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