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

doi:10.1016/j.lithos.2009.03.009

	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
	Wong, Jean 1; Sun, Min 1; Xing, Guangfu 2; Li, Xian-hua 3,4; Zhao, Guochun 1; Wong, Kenny 1; Yuan, Chao 3; Xia, Xiaoping 1; Li, Longming 1; Wu, Fuyuan 4
刊名	LITHOS
	2009-10-01
卷号	112 期号:3-4 页码:289-305
关键词	A-type granite Mesozoic South China Zircon U-Pb age Hf isotope
ISSN号	0024-4937
DOI	10.1016/j.lithos.2009.03.009
文献子类	Article
英文摘要	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 similar to 1.0) and has high SiO(2) (75 to 78 wt.%), total alkalis (Na(2)O + K(2)O = 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(2)O(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 (206)Pb/(238)U age of 126 +/- 3 Ma and zircons from this pluton give epsilon Hf(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 similar to 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. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词	ARCHEAN CRUSTAL EVOLUTION ; SOUTHEASTERN CHINA ; SE CHINA ; CONTINENTAL-CRUST ; YANGTZE CRATON ; IGNEOUS ROCKS ; WEST PACIFIC ; MAGMATIC ARC ; FLAT-SLAB ; ICP-MS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000271389800009
资助机构	Research Grant Council of Hong Kong(HKU 7041/05P) ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Chinese Ministry of Land and Resources(200811015) ; Chinese Ministry of Land and Resources(200811015) ; CAS(KZCX2-YW-Q08-3-6) ; CAS(KZCX2-YW-Q08-3-6) ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Chinese Ministry of Land and Resources(200811015) ; Chinese Ministry of Land and Resources(200811015) ; CAS(KZCX2-YW-Q08-3-6) ; CAS(KZCX2-YW-Q08-3-6) ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Chinese Ministry of Land and Resources(200811015) ; Chinese Ministry of Land and Resources(200811015) ; CAS(KZCX2-YW-Q08-3-6) ; CAS(KZCX2-YW-Q08-3-6) ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Research Grant Council of Hong Kong(HKU 7041/05P) ; Chinese Ministry of Land and Resources(200811015) ; Chinese Ministry of Land and Resources(200811015) ; CAS(KZCX2-YW-Q08-3-6) ; CAS(KZCX2-YW-Q08-3-6) ; CAS/SAFEA International Partnership Program for Creative Research Teams ; CAS/SAFEA International Partnership Program for Creative Research Teams
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71170]
专题	中国科学院地质与地球物理研究所
通讯作者	Sun, Min
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Inst Geol & Mineral Resources, Nanjing, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wong, Jean,Sun, Min,Xing, Guangfu,et al. 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[J]. LITHOS,2009,112(3-4):289-305.
APA	Wong, Jean.,Sun, Min.,Xing, Guangfu.,Li, Xian-hua.,Zhao, Guochun.,...&Wu, Fuyuan.(2009).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.LITHOS,112(3-4),289-305.
MLA	Wong, Jean,et al."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".LITHOS 112.3-4(2009):289-305.