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Constraints from zircon Hf-O-Li isotopic compositions on the genesis of slightly low-delta O-18 alkaline granites in the Taohuadao area, Zhejiang Province, SE China

文献类型：期刊论文

作者Gao, Yu-Ya1; Griffin, William L.2,3; Chu, Mei-Fei5; O'Reilly, Suzanne Y.2,3; Pearson, Norman J.2,3; Li, Qiu-Li1,4; Liu, Yu1,4; Tang, Guo-Qiang1,4; Li, Xian-Hua1,4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-11-01
卷号167页码:197-208
关键词A-type granite Zircon Li isotopes Low-delta O-18 granite East China
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.07.025
英文摘要The origins of the Mesozoic low-delta O-18 A-type granites in eastern China are quite controversial. A new "low-delta O-18" granite, the Taohuadao alkaline (A(1)-type) granite from the Zhoushan archipelago, offshore from Zhejiang, is reported in this study. Integrated in situ analyses of Hf-O-Li isotopes in zircon are used to provide insights on the petrogenesis and evolution of this granite, and low-delta O-18 granites in general. Three types of zircon have been recognized in Taohuadao samples: zircon with sector/oscillatary zoning (Type 1), disturbed zoning (Type 2) and extremely high-U (Type 3) grains. Data are carefully screened for radiation damage and post-magmatic alteration and only Type 1 zircon represents a magmatic origin. In Type 1 zircons, Type la with normal mantle delta O-18(zrn) value of 5.23 parts per thousand has a positive delta Li-7 value (2.0 +/- 3.3 parts per thousand), while Type 1b has a delta O-18 value of similar to 4.81 parts per thousand and highly variable negative delta Li-7 values (-31.9 parts per thousand to -0.3 parts per thousand). In contrast to the O-Li isotopes, zircon is quite homogeneous in terms of Hf isotopes (epsilon Hf-(t) = - 3.5 +/- 1.7), suggesting that the Taohuadao A(1)-type granites were derived from a simple source. Our results show that the magmatic zircon delta O-18(zrn) values are negatively correlated with Hf content but positively correlated with Zr/Hf ratio in zircon, which indicates that fractional crystallization plays an important role in producing the slightly low delta O-18 signature. The anhydrous nature of the As-type granites suppressed the crystallization of biotite and hornblende, while low oxygen fugacity is responsible for insufficient precipitation of magnetite, both of which drive the later differentiates towards slight depletion in O-18. Therefore, we suggest a ferrogabbro-type fractional crystallization may have played a major role in producing the chemical and oxygen isotopic variations of the Taohuadao A(1)-type granite and accounts for similar to 0.50 parts per thousand O-18-depletion. The extremely depleted delta Li-7 in Type 1b zircons is most likely a result of diffusion-driven fractionation. Mantle-like O-Li isotopes and very low Li abundance in zircon suggest a predominantly mantle origin with little, if any, involvement of continental crustal materials in the granite. Thus the Taohuadao A(1)-type granite was most likely produced by intensive fractionation of reduced, anhydrous basaltic melts, rather than by mixing of mantle- and crustally-derived melts as previously thought.
WOS关键词A-TYPE GRANITES ; U-PB AGE ; LOW-O-18 SILICIC MAGMAS ; SOUTH CHINA ; SOUTHEASTERN CHINA ; LITHIUM ISOTOPES ; OXYGEN ISOTOPES ; RHYOLITIC MAGMA ; IGNEOUS ROCKS ; ORIGIN
资助项目Chinese Academy of Sciences[XDB18000000] ; China Postdoctoral Science Foundation[2016M601127] ; National Natural Science Foundation of China[41603019] ; Macquarie University International Postgraduate Scholarship
WOS研究方向Geology
语种英语
WOS记录号WOS:000451492800014
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship ; Macquarie University International Postgraduate Scholarship
源URL[http://ir.iggcas.ac.cn/handle/132A11/89609]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Li, Xian-Hua
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Macquarie Univ, ARC Ctr Excellence Core Crust Arid Syst, N Ryde, NSW 2109, Australia
3.Macquarie Univ, Dept Earth & Planetary Sci, GEMOC, N Ryde, NSW 2109, Australia
4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
5.Natl Taiwan Univ, Inst Oceanog, Taipei 10617, Taiwan
推荐引用方式
GB/T 7714		 Gao, Yu-Ya,Griffin, William L.,Chu, Mei-Fei,et al. Constraints from zircon Hf-O-Li isotopic compositions on the genesis of slightly low-delta O-18 alkaline granites in the Taohuadao area, Zhejiang Province, SE China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,167:197-208.
APA Gao, Yu-Ya.,Griffin, William L..,Chu, Mei-Fei.,O'Reilly, Suzanne Y..,Pearson, Norman J..,...&Li, Xian-Hua.(2018).Constraints from zircon Hf-O-Li isotopic compositions on the genesis of slightly low-delta O-18 alkaline granites in the Taohuadao area, Zhejiang Province, SE China.JOURNAL OF ASIAN EARTH SCIENCES,167,197-208.
MLA Gao, Yu-Ya,et al."Constraints from zircon Hf-O-Li isotopic compositions on the genesis of slightly low-delta O-18 alkaline granites in the Taohuadao area, Zhejiang Province, SE China".JOURNAL OF ASIAN EARTH SCIENCES 167(2018):197-208.

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来源：地质与地球物理研究所

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