Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes
文献类型：期刊论文
| 作者 | Zhu DiCheng1,2; Mo XuanXue1,2; Wang LiQuan3; Zhao ZhiDan1,2; Niu Yaoling4; Zhou ChangYong3; Yang YueHeng5 |
| 刊名 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| 出版日期 | 2009-09-01 |
| 卷号 | 52期号:9页码:1223-1239 |
| 关键词 | zircon U-Pb dating Sr-Nd-Hf isotope highly fractionated I-type granite Zayu pluton eastern Gangdese Tibet |
| ISSN号 | 1006-9313 |
| DOI | 10.1007/s11430-009-0132-x |
| 文献子类 | Article |
| 英文摘要 | The Cretaceous granitoids in the middle and northern Gangdese, Tibet are generally interpreted as the products of anatexis of thickened deep crust genetically associated with the Lhasa-Qiangtang collision. This paper reports bulk-rock major element, trace element and Sr-Nd isotopic data, zircon U-Pb age data, and zircon Hf isotopic data on the Zayu pluton in eastern Gangdese, Tibet. These data shed new light on the petrogenesis of the pluton. Our SHRIMP zircon U-Pb age dates, along with LA-ICPMS zircon U-Pb age dates recently reported in the literature, indicate that the Zayu pluton was emplaced at about 130 Ma, coeval with Early Cretaceous magmatic rocks in other areas of eastern Gangdese (e.g., Rawu, Baxoi areas) and the Middle Gangdese. The Zayu pluton samples lack amphibole and muscovite, and are compositionally characterized by high SiO2 (69.9%-76.8%), K2O (4.4%-5.7%), and low P2O5 (0.05%-0.12%). These samples also have A/CNK values of 1.00-1.05, and are enriched in Rb, Th, U, and Pb, and depleted in Ba, Nb, Ta, Sr, P, Ti, and Eu. These geochemical features suggest that the Zayu pluton samples are metaluminous to slightly peraluminous and are of highly fractionated I-type granite. The Zayu pluton samples have high E > (Nd)(t) values (-10.9--7.6) and low initial Sr-87/Sr-86 ratios (0.7120-0.7179) relative to melts derived from mature continental crust in the Gangdese (e.g., Ningzhong Early Jurassic strongly peraluminous granite). The Zayu pluton samples are heterogeneous in zircon E > (Hf)(t) values (-12.8--2.9), yielding ancient zircon Hf crustal model ages of 1.4-2.0 Ga. The data obtained in this study together with the data in the recent literature suggest that the Early Cretaceous granitoids in eastern Gangdese represent the eastward extension of the Early Cretaceous magmatism in the middle Gangdese, and that the Lhasa micro-continent block with ancient basement may extend for similar to 2000 km from east to west. Zircon Hf isotopic data and bulk-rock zircon saturation temperature (789-821 A degrees C) indicate that mantle-derived materials likely played a role in the generation of the Zayu pluton. We propose that the Zayu pluton was most likely generated in a setting associated with southward subduction of the Bangong-Nujiang ocean floor, where mantle wedge-derived magmas may have provided the heat and material for the anatexis of ancient crust of the Lhasa micro-continent, resulted in hybrid melts (i.e., mantle-derived basaltic magmas + crust-derived felsic magmas). Such hybrid melts with subsequent fractional crystallization are responsible for the highly evolved Zayu pluton (crust thickening is not a prerequisite). |
| WOS关键词 | A-TYPE GRANITES ; SOUTHERN TIBET ; VOLCANIC-ROCKS ; LU-HF ; TECTONIC EVOLUTION ; TRACE-ELEMENTS ; LHASA TERRANE ; SE CHINA ; BATHOLITH ; AGE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000269974200001 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China(40572051 ; National Natural Science Foundation of China(40572051 ; National Basic Research Program of China(2009CB421002) ; National Basic Research Program of China(2009CB421002) ; Chinese "111" Project(B07011) ; Chinese "111" Project(B07011) ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; 40830317 ; 40830317 ; 40873023 ; 40873023 ; 40672044) ; 40672044) ; National Natural Science Foundation of China(40572051 ; National Natural Science Foundation of China(40572051 ; National Basic Research Program of China(2009CB421002) ; National Basic Research Program of China(2009CB421002) ; Chinese "111" Project(B07011) ; Chinese "111" Project(B07011) ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; 40830317 ; 40830317 ; 40873023 ; 40873023 ; 40672044) ; 40672044) ; National Natural Science Foundation of China(40572051 ; National Natural Science Foundation of China(40572051 ; National Basic Research Program of China(2009CB421002) ; National Basic Research Program of China(2009CB421002) ; Chinese "111" Project(B07011) ; Chinese "111" Project(B07011) ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; 40830317 ; 40830317 ; 40873023 ; 40873023 ; 40672044) ; 40672044) ; National Natural Science Foundation of China(40572051 ; National Natural Science Foundation of China(40572051 ; National Basic Research Program of China(2009CB421002) ; National Basic Research Program of China(2009CB421002) ; Chinese "111" Project(B07011) ; Chinese "111" Project(B07011) ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; Programme of the Integrated Study of Basic Geology of Qinghai-Tibetan Plateau of the China Geological Survey ; 40830317 ; 40830317 ; 40873023 ; 40873023 ; 40672044) ; 40672044) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/71610]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhu DiCheng |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.Chengdu Inst Geol & Mineral Resources, Chengdu 610082, Peoples R China 4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu DiCheng,Mo XuanXue,Wang LiQuan,et al. Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2009,52(9):1223-1239. |
| APA | Zhu DiCheng.,Mo XuanXue.,Wang LiQuan.,Zhao ZhiDan.,Niu Yaoling.,...&Yang YueHeng.(2009).Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,52(9),1223-1239. |
| MLA | Zhu DiCheng,et al."Petrogenesis of highly fractionated I-type granites in the Zayu area of eastern Gangdese, Tibet: Constraints from zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopes".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 52.9(2009):1223-1239. |
入库方式： OAI收割
来源：地质与地球物理研究所
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