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Article: The Grenvillian Songshugou ophiolite in the Qinling Mountains, Central China: Implications for the tectonic evolution of the Qinling orogenic belt

TitleThe Grenvillian Songshugou ophiolite in the Qinling Mountains, Central China: Implications for the tectonic evolution of the Qinling orogenic belt
Authors
KeywordsCentral China
Geochemistry
Meta-basalt
Ophiolite
Proterozoic tectonics
Qinling orogenic belt
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2008, v. 32 n. 5-6, p. 325-335 How to Cite?
AbstractThe Qinling Mountains in Central China mark a gigantic composite orogenic belt with a complex tectonic evolution involving multiple phases of rifting and convergence. This belt separates the North China and South China Blocks and consists of the South and North Qinling terranes separated by the Shangdan suture. The suture is marked by the Grenvillian Songshugou ophiolite along the southern margin of the North Qinling terrane, which is key to understanding the Proterozoic tectonic evolution of the belt. The ophiolite consists of highly metamorphosed ultramafic and mafic rocks. Three groups of meta-basalts are present: group 1 rocks are LREE depleted and have a MORB compositional affinity. Their low Ta/Yb ratios (<0.1) are consistent with high degrees of partial melting of a depleted asthenospheric mantle. Rocks of group 2 have higher TiO 2 (1.63-2.08 wt%) and Ta/Yb ratios (>0.12), and display slight enrichment of LREE, suggesting that the original magmas were derived from a depleted mantle source mixed with some enriched material. Samples from group 3 are enriched in LREE and other incompatible elements (Ti, Zr, Ta, Nb), suggesting derivation from an enriched mantle source, possibly a plume. All the basalts have high εNd(t) (+4.2 to +6.9), variable εSr(t) and high 207Pb/ 204Pb and 208Pb/ 204Pb ratios for given 206Pb/ 204Pb ratios. These characteristics are compatible with formation at a mid-ocean ridge system above an anomalous Dupal mantle region. The mafic rocks have a Sm-Nd whole-rock isochron age of 1030 ± 46 Ma. The Songshugou ophiolite was emplaced onto the southern margin of the North Qinling terrane, an active continental margin from the Meso-Proterozoic to Neo-Proterozoic. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72653
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDong, YPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhang, GWen_HK
dc.contributor.authorZhou, DWen_HK
dc.contributor.authorLiu, Len_HK
dc.contributor.authorZhang, Qen_HK
dc.date.accessioned2010-09-06T06:43:51Z-
dc.date.available2010-09-06T06:43:51Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2008, v. 32 n. 5-6, p. 325-335en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72653-
dc.description.abstractThe Qinling Mountains in Central China mark a gigantic composite orogenic belt with a complex tectonic evolution involving multiple phases of rifting and convergence. This belt separates the North China and South China Blocks and consists of the South and North Qinling terranes separated by the Shangdan suture. The suture is marked by the Grenvillian Songshugou ophiolite along the southern margin of the North Qinling terrane, which is key to understanding the Proterozoic tectonic evolution of the belt. The ophiolite consists of highly metamorphosed ultramafic and mafic rocks. Three groups of meta-basalts are present: group 1 rocks are LREE depleted and have a MORB compositional affinity. Their low Ta/Yb ratios (<0.1) are consistent with high degrees of partial melting of a depleted asthenospheric mantle. Rocks of group 2 have higher TiO 2 (1.63-2.08 wt%) and Ta/Yb ratios (>0.12), and display slight enrichment of LREE, suggesting that the original magmas were derived from a depleted mantle source mixed with some enriched material. Samples from group 3 are enriched in LREE and other incompatible elements (Ti, Zr, Ta, Nb), suggesting derivation from an enriched mantle source, possibly a plume. All the basalts have high εNd(t) (+4.2 to +6.9), variable εSr(t) and high 207Pb/ 204Pb and 208Pb/ 204Pb ratios for given 206Pb/ 204Pb ratios. These characteristics are compatible with formation at a mid-ocean ridge system above an anomalous Dupal mantle region. The mafic rocks have a Sm-Nd whole-rock isochron age of 1030 ± 46 Ma. The Songshugou ophiolite was emplaced onto the southern margin of the North Qinling terrane, an active continental margin from the Meso-Proterozoic to Neo-Proterozoic. © 2007 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
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.subjectCentral Chinaen_HK
dc.subjectGeochemistryen_HK
dc.subjectMeta-basalten_HK
dc.subjectOphioliteen_HK
dc.subjectProterozoic tectonicsen_HK
dc.subjectQinling orogenic belten_HK
dc.titleThe Grenvillian Songshugou ophiolite in the Qinling Mountains, Central China: Implications for the tectonic evolution of the Qinling orogenic belten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=32&issue=5-6&spage=325&epage=335&date=2008&atitle=The+Grenvillian+Songshugou+ophiolite+in+the+Qinling+Mountains,+Central+China:+Implications+for+the+tectonic+evolution+of+the+Qinling+orogenic+belten_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2007.11.010en_HK
dc.identifier.scopuseid_2-s2.0-41849150430en_HK
dc.identifier.hkuros167304en_HK
dc.identifier.hkuros144301-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-41849150430&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume32en_HK
dc.identifier.issue5-6en_HK
dc.identifier.spage325en_HK
dc.identifier.epage335en_HK
dc.identifier.isiWOS:000256265700003-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridDong, YP=8668143700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhang, GW=26026130000en_HK
dc.identifier.scopusauthoridZhou, DW=7403394397en_HK
dc.identifier.scopusauthoridLiu, L=7405259393en_HK
dc.identifier.scopusauthoridZhang, Q=35515964300en_HK

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