| 藏北羌塘果干加年山花岗闪长岩的锆石U-Pb定年和Hf同位素特征 |
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| 引用本文： | 胡培远,李才,解超明,王明,李娇,钟林汐.藏北羌塘果干加年山花岗闪长岩的锆石U-Pb定年和Hf同位素特征[J].西北地质,2014(1):52-60. |
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| 作者姓名： | 胡培远 李才 解超明 王明 李娇 钟林汐 |
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| 作者单位： | 吉林大学地球科学学院;中国科学院地质与地球物理研究所;中国地质大学(北京); |
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| 基金项目： | 国家自然科学基金项目“冈底斯地区寒武系及泛非-早古生代造山事件研究”(41272240)资助 |
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| 摘 要： | 报道了藏北羌塘中部果干加年山地区花岗闪长岩的锆石U-Pb定年结果和Hf同位素成分。花岗闪长岩的锆石U-Pb定年结果为(225.1±2.4)Ma,与该地区的高压变质带的形成时代一致。样品中锆石的εHf(t)值为-9.8~-17.6,地壳Hf模式年龄为1 874~2 372Ma,表明花岗闪长岩为古元古代地壳物质部分熔融的产物。结合区域地质资料,该花岗岩体可能形成于板块消减的火山弧构造环境,与羌塘地区古特提斯洋的晚三叠世俯冲消减有关。
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| 关 键 词： | 青藏高原 羌塘 花岗闪长岩 锆石U—Pb定年 锆石Hf同位素 |
Zircon U-Pb Dating and Hf-isotope Compositions of Granodiorite From the Guoganjianian Mountain Area,Central Qiangtang,Northern Tibet,China |
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| Institution: | HU Pei-yuan , LI Cai , JIE Chao-ming , WANG Ming , LI Jiao , ZHONG Lin-xi (1. College of Earth Science, J ilin University, Changchun 130061, China; 2. Chinese Academy of Sciences, Beijing 100029, China; 3. China University of Geosciences, Beijing 100083, China) |
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| Abstract: | This paper reports new zircon U-Pb age and Hf-isotope data of granodiorites in Guoganjianian Mountain area, central Qiangtang, northern Tibet, China. Zircon LA-ICP-MS dating for granodiorites yields a weighted mean age of 225.1±2.4Ma. This age is consistent with that of the high pressure metamorphic rocks in this area. Moreover, the zircon εHf（t） values （from -9.8 to -17.6） and TDMC model ages （1874—2372 Ma） indicate that they were generated by the partial melting of the Paleo-proterozoic crust. According to regional geological data, the granodiorites of this study probably formed in a volcanic arc tectonic setting and was result of the subduction of Paleo-Tethys Ocean in the Late Triassic. |
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| Keywords: | Tibetan plateau Qiangtang granodiorite zircon U-Pb dating zircon Hf-isotope |
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