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Article: Reappraisal of the ages of Neoproterozoic strata in South China: No connection with the Grenvillian orogeny

TitleReappraisal of the ages of Neoproterozoic strata in South China: No connection with the Grenvillian orogeny
Authors
KeywordsCathaysia block
Fold belts
Neoproterozoic
Oceanic subduction
Yangtze block
Issue Date2011
PublisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/
Citation
Geology, 2011, v. 39 n. 4, p. 299-302 How to Cite?
AbstractThe Jiangnan fold belt separates the Yangtze and Cathaysia blocks in South China and has long been considered Grenvillian in age in order to place South China in central Rodinia. It consists of deformed Early Neoproterozoic strata that are unconformably overlain by undeformed Late Neoproterozoic strata and intruded by undeformed and unmetamorphosed granitic plutons. Zircons from the Early Neoproterozoic strata yield U-Pb ages as young as 830 Ma, and one granitic pluton has a zircon U-Pb age of ca. 827 Ma. The ≥830 Ma mafic rocks along the southeastern margin of the Yangtze block have arc-affinity geochemical characters, whereas mafic rocks younger than 830 Ma have typical ocean island basalt (OIB)-like compositions. Thus, we suggest that the Early Neoproterozoic strata were deposited on an active continental margin prior to amalgamation of the Yangtze and Cathaysia blocks at ca. 830 Ma. The overlying Late Neoproterozoic strata were deposited in the intracontinental rifted Nanhua Basin at 820-730 Ma and probably reflect backarc spreading above the longlived (950-735 Ma) oceanic subduction zone along the northern and western margin of the Yangtze block. This model is consistent with the secular tectonic evolution of South China during the Neoproterozoic. The Jiangnan fold belt is therefore not a Grenvillian feature as previously suggested, and there is no evidence to place South China in central Rodinia. Instead, we believe that South China was located in a marginal position relative to this supercontinent. © 2011 Geological Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/139217
ISSN
2015 Impact Factor: 4.548
2015 SCImago Journal Rankings: 3.278
ISI Accession Number ID
Funding AgencyGrant Number
National Nature Science Foundation of China40873027
90714002
40821061
Special Fund for Basic Scientific Research of Central Colleges
China University of Geosciences (Wuhan)
Research Grant Council of Hong Kong, ChinaHKU7070/09P
Funding Information:

This work was substantially supported by the National Nature Science Foundation of China (40873027, 90714002, 40821061), the Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan), and a research grant from the Research Grant Council of Hong Kong, China (HKU7070/09P). Reviews by William Collins, Tim Kusky, and Paul T. Robinson are gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZheng, JPen_HK
dc.contributor.authorLi, JWen_HK
dc.date.accessioned2011-09-23T05:47:13Z-
dc.date.available2011-09-23T05:47:13Z-
dc.date.issued2011en_HK
dc.identifier.citationGeology, 2011, v. 39 n. 4, p. 299-302en_HK
dc.identifier.issn0091-7613en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139217-
dc.description.abstractThe Jiangnan fold belt separates the Yangtze and Cathaysia blocks in South China and has long been considered Grenvillian in age in order to place South China in central Rodinia. It consists of deformed Early Neoproterozoic strata that are unconformably overlain by undeformed Late Neoproterozoic strata and intruded by undeformed and unmetamorphosed granitic plutons. Zircons from the Early Neoproterozoic strata yield U-Pb ages as young as 830 Ma, and one granitic pluton has a zircon U-Pb age of ca. 827 Ma. The ≥830 Ma mafic rocks along the southeastern margin of the Yangtze block have arc-affinity geochemical characters, whereas mafic rocks younger than 830 Ma have typical ocean island basalt (OIB)-like compositions. Thus, we suggest that the Early Neoproterozoic strata were deposited on an active continental margin prior to amalgamation of the Yangtze and Cathaysia blocks at ca. 830 Ma. The overlying Late Neoproterozoic strata were deposited in the intracontinental rifted Nanhua Basin at 820-730 Ma and probably reflect backarc spreading above the longlived (950-735 Ma) oceanic subduction zone along the northern and western margin of the Yangtze block. This model is consistent with the secular tectonic evolution of South China during the Neoproterozoic. The Jiangnan fold belt is therefore not a Grenvillian feature as previously suggested, and there is no evidence to place South China in central Rodinia. Instead, we believe that South China was located in a marginal position relative to this supercontinent. © 2011 Geological Society of America.en_HK
dc.languageengen_US
dc.publisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/en_HK
dc.relation.ispartofGeologyen_HK
dc.subjectCathaysia block-
dc.subjectFold belts-
dc.subjectNeoproterozoic-
dc.subjectOceanic subduction-
dc.subjectYangtze block-
dc.titleReappraisal of the ages of Neoproterozoic strata in South China: No connection with the Grenvillian orogenyen_HK
dc.typeArticleen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1130/G31701.1en_HK
dc.identifier.scopuseid_2-s2.0-79954620931en_HK
dc.identifier.hkuros195324en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79954620931&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume39en_HK
dc.identifier.issue4en_HK
dc.identifier.spage299en_HK
dc.identifier.epage302en_HK
dc.identifier.isiWOS:000288507300003-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhao, JH=11140043500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridZheng, JP=24342619200en_HK
dc.identifier.scopusauthoridLi, JW=36067183300en_HK

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