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Article: Kwangsian crustal anatexis within the eastern South China Block: geochemical, zircon U-Pb geochronological and Hf isotopic fingerprints from the gneissoid granites of Wugong and Wuyi-Yunkai Domains

TitleKwangsian crustal anatexis within the eastern South China Block: geochemical, zircon U-Pb geochronological and Hf isotopic fingerprints from the gneissoid granites of Wugong and Wuyi-Yunkai Domains
Authors
KeywordsAnatexis
Crustal structure
Geochemistry
Geochronology
Gneiss
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2011, v. 127 n. 1-2, p. 239-260 How to Cite?
AbstractGneissoid granites were traditionally thought to be the components of the Precambrian basement in the eastern South China Block, but twenty-four gneissoid granite samples from the Wugong, northern Wuyi, southern Wuyi and Yunkai Domains gave zircon U-Pb ages of 424-456Ma, 410-457Ma, 426-438Ma and 415-450Ma, respectively. The existence of the abundant Kwangsian gneissoid granites, which have incorrectly been assigned to the Precambrian basement, indicates that the 'so-called' Precambrian stratigraphic sequence of the Cathaysia Block should be termed 'Complex' rather than 'Group'. These gneissoid granites are peraluminous granites with relatively high Al 2O 3, MgO, TiO 2, FeOt and CaO/Na 2O but low CaO, Al 2O 3/(MgO+FeOt) and Rb/Sr ratios. They exhibit strongly negative Ba, Sr, Nb, P and Ti and positive Pb anomalies in primitive mantle-normalized diagrams, and have initial 87Sr/ 86Sr ratios ranging from 0.70924 to 0.72935 and negative εNd(t) values from -6.4 to -11.4, similar to those of paragneissic enclaves and Precambrian sedimentary rocks in the eastern South China Block. The zircons crystallized in the Kwangsian gneissoid granites gave εHf(t) values ranging from +2.4 to -19.4 with the peak at -4 (almost all grains clustering at -1 to -12) and Hf model ages of 1.1-2.1Ga. The synthesis of these geochemical and in-situ zircon Hf isotopic data indicates that the Kwangsian gneissoid granites dominantly originated from Proterozoic metapelitic and meta-igneous components with insignificant input of juvenile mantle-derived magmas. A model of two-stage crustal anatexis is proposed for the Kwangsian granitic magma in the eastern South China Block, with (1) the formation of 460-430Ma granite through the breakdown of hydrous minerals under the condition of the doubly thickened crust, and (2) the generation of the 430-400Ma granite accompanying promoted melting along a path of isothermal decompression due to the increasing thermal weakening for the collapse of the thickened crust. The crustal anatexis has probably occurred in an intracontinental tectonic regime that was geodynamically linked to the far-field response to the assembly of the Australian-Indian plate with the Cathaysia Block during middle Paleozoic (Kwangsian) time. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151330
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411403
China Natural Science Foundation40825009
40830319
40772129
Hong Kong RGC Projects7055/03P
Chinese Academy of SciencesKZCX1-YW-15-1
Sin-British Fellowship Trust
Funding Information:

We would like to thank X-P Xia for his help during the zircon U-Pb analyses. We are grateful to Profs. Stefan Jung, J. Charvet, Nelson Eby and an anonymous reviewer for their critical and constructive review, which led to major improvement of the manuscript. This study was jointly funded by the National Basic Research Program of China (2007CB411403), China Natural Science Foundation (40825009, 40830319 and 40772129), Hong Kong RGC Projects (7055/03P) and the Chinese Academy of Sciences (KZCX1-YW-15-1). We are grateful for the support from the Sin-British Fellowship Trust Visitorship 2009-2010 to Y-J Wang and Coucher Foundation for the joint Laboratory between HKU and Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. This is GIGCAS Publication No.1382 and a contribution to Guangzhou Institute of Geochemistry, Chinese Academy of Sciences.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_US
dc.contributor.authorZhang, Aen_US
dc.contributor.authorFan, Wen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorZhang, Gen_US
dc.contributor.authorZhang, Yen_US
dc.contributor.authorZhang, Fen_US
dc.contributor.authorLi, Sen_US
dc.date.accessioned2012-06-26T06:20:43Z-
dc.date.available2012-06-26T06:20:43Z-
dc.date.issued2011en_US
dc.identifier.citationLithos, 2011, v. 127 n. 1-2, p. 239-260en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151330-
dc.description.abstractGneissoid granites were traditionally thought to be the components of the Precambrian basement in the eastern South China Block, but twenty-four gneissoid granite samples from the Wugong, northern Wuyi, southern Wuyi and Yunkai Domains gave zircon U-Pb ages of 424-456Ma, 410-457Ma, 426-438Ma and 415-450Ma, respectively. The existence of the abundant Kwangsian gneissoid granites, which have incorrectly been assigned to the Precambrian basement, indicates that the 'so-called' Precambrian stratigraphic sequence of the Cathaysia Block should be termed 'Complex' rather than 'Group'. These gneissoid granites are peraluminous granites with relatively high Al 2O 3, MgO, TiO 2, FeOt and CaO/Na 2O but low CaO, Al 2O 3/(MgO+FeOt) and Rb/Sr ratios. They exhibit strongly negative Ba, Sr, Nb, P and Ti and positive Pb anomalies in primitive mantle-normalized diagrams, and have initial 87Sr/ 86Sr ratios ranging from 0.70924 to 0.72935 and negative εNd(t) values from -6.4 to -11.4, similar to those of paragneissic enclaves and Precambrian sedimentary rocks in the eastern South China Block. The zircons crystallized in the Kwangsian gneissoid granites gave εHf(t) values ranging from +2.4 to -19.4 with the peak at -4 (almost all grains clustering at -1 to -12) and Hf model ages of 1.1-2.1Ga. The synthesis of these geochemical and in-situ zircon Hf isotopic data indicates that the Kwangsian gneissoid granites dominantly originated from Proterozoic metapelitic and meta-igneous components with insignificant input of juvenile mantle-derived magmas. A model of two-stage crustal anatexis is proposed for the Kwangsian granitic magma in the eastern South China Block, with (1) the formation of 460-430Ma granite through the breakdown of hydrous minerals under the condition of the doubly thickened crust, and (2) the generation of the 430-400Ma granite accompanying promoted melting along a path of isothermal decompression due to the increasing thermal weakening for the collapse of the thickened crust. The crustal anatexis has probably occurred in an intracontinental tectonic regime that was geodynamically linked to the far-field response to the assembly of the Australian-Indian plate with the Cathaysia Block during middle Paleozoic (Kwangsian) time. © 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/lithosen_US
dc.relation.ispartofLithosen_US
dc.subjectAnatexisen_US
dc.subjectCrustal structureen_US
dc.subjectGeochemistryen_US
dc.subjectGeochronologyen_US
dc.subjectGneissen_US
dc.titleKwangsian crustal anatexis within the eastern South China Block: geochemical, zircon U-Pb geochronological and Hf isotopic fingerprints from the gneissoid granites of Wugong and Wuyi-Yunkai Domainsen_US
dc.typeArticleen_US
dc.identifier.emailWang, Y: yjwang@gig.ac.cnen_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2011.07.027en_US
dc.identifier.scopuseid_2-s2.0-80053627093en_US
dc.identifier.hkuros204300-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053627093&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume127en_US
dc.identifier.issue1-2en_US
dc.identifier.spage239en_US
dc.identifier.epage260en_US
dc.identifier.isiWOS:000298070600016-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, S=35248444400en_US
dc.identifier.scopusauthoridZhang, F=35114400600en_US
dc.identifier.scopusauthoridZhang, Y=7601316316en_US
dc.identifier.scopusauthoridZhang, G=35085644800en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridFan, W=7401635313en_US
dc.identifier.scopusauthoridZhang, A=7402772951en_US
dc.identifier.scopusauthoridWang, Y=36496272800en_US
dc.identifier.citeulike9687654-

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