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Article: Geochemical and zircon U-Pb and Hf isotopic study of the Baijuhuajian metaluminous A-type granite: Extension at 125-100 Ma and its tectonic significance for South China

TitleGeochemical and zircon U-Pb and Hf isotopic study of the Baijuhuajian metaluminous A-type granite: Extension at 125-100 Ma and its tectonic significance for South China
Authors
KeywordsA-type granite
Hf isotope
Mesozoic
South China
Zircon U-Pb age
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 112 n. 3-4, p. 289-305 How to Cite?
Abstract
The Early Cretaceous Baijuhuajian pluton is an A-type granitic intrusion, emplaced along the Jiangshan-Shaoxing (JSSX) fault zone in western Zhejiang Province, SE South China. It intruded into a Late Jurassic volcanic basin bounded by Proterozoic sandstone and siltstone. The granite has a coarse-grained, porphyritic texture and is composed of alkali feldspar phenocrysts in a matrix of K-feldspar, quartz, plagioclase and biotite. The pluton has a clear A-type geochemical signature, e.g. it is metaluminous (A/CNK ~ 1.0) and has high SiO 2 (75 to 78 wt.%), total alkalis (Na 2O + K 2O = 4.8 to 8.5 wt.%), rare earth elements (total REE = 228 to 438 ppm), HFSE and Fe* [FeO t/(FeO t + MgO) = 0.87 to 0.97]. On the other hand, it is characterized by low CaO (0.51 to 1.01 wt.%), TiO 2 (0.06 to 0.13 wt.%), P 2O 5 (below detection) and Sr (7.0 to 9.5 ppm). The hypersolvus texture and fine-grained groundmass indicate emplacement at a shallow-depth. SHRIMP U-Pb zircon dating yielded a weighted mean 206Pb/ 238U age of 126 ± 3 Ma and zircons from this pluton give εHf(T) values between - 0.52 and + 4.24, suggesting the importance of juvenile material in the magma source. Most of the plutonic rocks in southeast China are calc-alkaline, subduction-related intrusions of Jurassic and Cretaceous age. Previous studies suggested that the sparse A-type granites in South China were emplaced in two episodes: 190-155 Ma in the inland area and ~ 100 Ma along the coastal area in SE South China. Our study of the Baijuhuajian granite, together with the coeval Suzhou A-type granite (123 Ma) in Jiangsu Province, defines an important extensional event between 125 and 100 Ma. Considering the available data for the Mesozoic igneous rocks in South China, we suggest that subduction of the Pacific plate in the Mesozoic produced voluminous calc-alkaline granitoids and volcanic rocks with a younging trend from west to east. The A-type granites were generated during periods of local extension at 190-155 Ma and 125-100 Ma, perhaps corresponding to localized rollback of the Pacific plate. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/123921
ISSN
2013 Impact Factor: 3.654
2013 SCImago Journal Rankings: 2.514
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 7041/05P
Chinese Ministry of Land and Resources200811015
CASKZCX2-YW-Q08-3-6
CAS/SAFEA International Partnership Program for Creative Research Teams
Funding Information:

The authors are grateful for Drs. Paul Robinson and Nelson Eby and an anonymous reviewer for their constructive reviews, which significantly improved the quality of this paper. Bernard Bonin is also thanked for his invaluable comments on an early version of this paper. We would like to thank Gregory Shellnutt and George S.-K. Ma for their scientific discussion and Xiao Fu, Lily Chiu, Liang Qi, Liewen Xie, Yueheng Yang and Jiangfeng Gao for their assistance with the Egeochemical analyses. This study was supported by the Research Grant Council of Hong Kong (HKU 7041/05P), the Chinese Ministry of Land and Resources (200811015), Knowledge Innovation Project of CAS (KZCX2-YW-Q08-3-6), and the CAS/SAFEA International Partnership Program for Creative Research Teams.

References
Grants

 

Author Affiliations
  1. Institute of Geology and Mineral Resources
  2. The University of Hong Kong
  3. Institute of Geology and Geophysics Chinese Academy of Sciences
  4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences
DC FieldValueLanguage
dc.contributor.authorWong, Jen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorXing, Gen_HK
dc.contributor.authorLi, Xhen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorWong, Ken_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorLi, Len_HK
dc.contributor.authorWu, Fen_HK
dc.date.accessioned2010-10-07T07:21:01Z-
dc.date.available2010-10-07T07:21:01Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 112 n. 3-4, p. 289-305en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/123921-
dc.description.abstractThe Early Cretaceous Baijuhuajian pluton is an A-type granitic intrusion, emplaced along the Jiangshan-Shaoxing (JSSX) fault zone in western Zhejiang Province, SE South China. It intruded into a Late Jurassic volcanic basin bounded by Proterozoic sandstone and siltstone. The granite has a coarse-grained, porphyritic texture and is composed of alkali feldspar phenocrysts in a matrix of K-feldspar, quartz, plagioclase and biotite. The pluton has a clear A-type geochemical signature, e.g. it is metaluminous (A/CNK ~ 1.0) and has high SiO 2 (75 to 78 wt.%), total alkalis (Na 2O + K 2O = 4.8 to 8.5 wt.%), rare earth elements (total REE = 228 to 438 ppm), HFSE and Fe* [FeO t/(FeO t + MgO) = 0.87 to 0.97]. On the other hand, it is characterized by low CaO (0.51 to 1.01 wt.%), TiO 2 (0.06 to 0.13 wt.%), P 2O 5 (below detection) and Sr (7.0 to 9.5 ppm). The hypersolvus texture and fine-grained groundmass indicate emplacement at a shallow-depth. SHRIMP U-Pb zircon dating yielded a weighted mean 206Pb/ 238U age of 126 ± 3 Ma and zircons from this pluton give εHf(T) values between - 0.52 and + 4.24, suggesting the importance of juvenile material in the magma source. Most of the plutonic rocks in southeast China are calc-alkaline, subduction-related intrusions of Jurassic and Cretaceous age. Previous studies suggested that the sparse A-type granites in South China were emplaced in two episodes: 190-155 Ma in the inland area and ~ 100 Ma along the coastal area in SE South China. Our study of the Baijuhuajian granite, together with the coeval Suzhou A-type granite (123 Ma) in Jiangsu Province, defines an important extensional event between 125 and 100 Ma. Considering the available data for the Mesozoic igneous rocks in South China, we suggest that subduction of the Pacific plate in the Mesozoic produced voluminous calc-alkaline granitoids and volcanic rocks with a younging trend from west to east. The A-type granites were generated during periods of local extension at 190-155 Ma and 125-100 Ma, perhaps corresponding to localized rollback of the Pacific plate. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.-
dc.subjectA-type graniteen_HK
dc.subjectHf isotopeen_HK
dc.subjectMesozoicen_HK
dc.subjectSouth Chinaen_HK
dc.subjectZircon U-Pb ageen_HK
dc.titleGeochemical and zircon U-Pb and Hf isotopic study of the Baijuhuajian metaluminous A-type granite: Extension at 125-100 Ma and its tectonic significance for South Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=112&issue=3-4&spage=289&epage=305&date=2009&atitle=Geochemical+and+zircon+U–Pb+and+Hf+isotopic+study+of+the+Baijuhuajian+metaluminous+A-type+granite:+Extension+at+125–100+Ma+and+its+tectonic+significance+for+South+China-
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailXia, X: xpxia@hotmail.comen_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2009.03.009en_HK
dc.identifier.scopuseid_2-s2.0-70349132312en_HK
dc.identifier.hkuros175432-
dc.identifier.hkuros167548-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70349132312&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume112en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage289en_HK
dc.identifier.epage305en_HK
dc.identifier.isiWOS:000271389800009-
dc.publisher.placeNetherlandsen_HK
dc.relation.projectUsing U-Pb and Hf isotope compositions of inherited zircon cores from granitoids to constrain the suture between the Yangtze and Cathaysia Blocks-
dc.identifier.scopusauthoridWong, J=35207628900en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridXing, G=7103115605en_HK
dc.identifier.scopusauthoridLi, Xh=35229968100en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWong, K=34769228100en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK
dc.identifier.scopusauthoridLi, L=24528876400en_HK
dc.identifier.scopusauthoridWu, F=40561925600en_HK

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