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
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| Title | 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 |
|---|---|
| Authors | Wong, J2 Sun, M2 Xing, G1 Li, Xh3 4 Zhao, G2 Wong, K2 Yuan, C4 Xia, X2 Li, L2 Wu, F3 |
| Keywords | A-type granite Hf isotope Mesozoic South China Zircon U-Pb age |
| Issue Date | 2009 |
| Publisher | Elsevier 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?] DOI: http://dx.doi.org/10.1016/j.lithos.2009.03.009 |
| 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. |
| ISSN | 0024-4937 2011 Impact Factor: 3.246 2011 SCImago Journal Rankings: 0.112 |
| DOI | http://dx.doi.org/10.1016/j.lithos.2009.03.009 |
| References | References in Scopus |
| Grants | Using U-Pb and Hf isotope compositions of inherited zircon cores from granitoids to constrain the suture between the Yangtze and Cathaysia Blocks Using U-Pb and Hf isotope compositions of inherited zircon cores from granitoids to constrain the suture between the Yangtze and Cathaysia Blocks |
| dc.contributor.author | Wong, J | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| dc.contributor.author | Sun, M | ||||||||||
| dc.contributor.author | Xing, G | ||||||||||
| dc.contributor.author | Li, Xh | ||||||||||
| dc.contributor.author | Zhao, G | ||||||||||
| dc.contributor.author | Wong, K | ||||||||||
| dc.contributor.author | Yuan, C | ||||||||||
| dc.contributor.author | Xia, X | ||||||||||
| dc.contributor.author | Li, L | ||||||||||
| dc.contributor.author | Wu, F | ||||||||||
| dc.date.accessioned | 2010-10-07T07:21:01Z | ||||||||||
| dc.date.available | 2010-10-07T07:21:01Z | ||||||||||
| dc.date.issued | 2009 | ||||||||||
| dc.description.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. | ||||||||||
| dc.description.grant | Using U-Pb and Hf isotope compositions of inherited zircon cores from granitoids to constrain the suture between the Yangtze and Cathaysia Blocks | ||||||||||
| dc.description.grant | Using U-Pb and Hf isotope compositions of inherited zircon cores from granitoids to constrain the suture between the Yangtze and Cathaysia Blocks | ||||||||||
| dc.description.grantcode | 28118 | ||||||||||
| dc.description.grantcode | 37049 | ||||||||||
| dc.description.nature | link_to_subscribed_fulltext | ||||||||||
| dc.identifier.citation | Lithos, 2009, v. 112 n. 3-4, p. 289-305 [How to Cite?] DOI: http://dx.doi.org/10.1016/j.lithos.2009.03.009 | ||||||||||
| dc.identifier.doi | http://dx.doi.org/10.1016/j.lithos.2009.03.009 | ||||||||||
| dc.identifier.epage | 305 | ||||||||||
| dc.identifier.hkuros | 175432 | ||||||||||
| dc.identifier.hkuros | 167548 | ||||||||||
| dc.identifier.isi | WOS:000271389800009
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. | ||||||||||
| dc.identifier.issn | 0024-4937 2011 Impact Factor: 3.246 2011 SCImago Journal Rankings: 0.112 | ||||||||||
| dc.identifier.issue | 3-4 | ||||||||||
| dc.identifier.openurl | | ||||||||||
| dc.identifier.scopus | eid_2-s2.0-70349132312 | ||||||||||
| dc.identifier.spage | 289 | ||||||||||
| dc.identifier.uri | http://hdl.handle.net/10722/123921 | ||||||||||
| dc.identifier.volume | 112 | ||||||||||
| dc.language | eng | ||||||||||
| dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos | ||||||||||
| dc.publisher.place | Netherlands | ||||||||||
| dc.relation.ispartof | Lithos | ||||||||||
| dc.relation.references | References in Scopus | ||||||||||
| dc.rights | Lithos. Copyright © Elsevier BV. | ||||||||||
| dc.subject | A-type granite | ||||||||||
| dc.subject | Hf isotope | ||||||||||
| dc.subject | Mesozoic | ||||||||||
| dc.subject | South China | ||||||||||
| dc.subject | Zircon U-Pb age | ||||||||||
| dc.title | 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.type | Article |
Author Affiliations
- Institute of Geology and Mineral Resources
- The University of Hong Kong
- Institute of Geology and Geophysics Chinese Academy of Sciences
- Guangzhou Institute of Geochemistry Chinese Academy of Sciences