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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

胡培远, 李才, 解超明, 王明, 李娇, 钟林汐

胡培远, 李才, 解超明, 等. 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, 47(1): 52-60.
引用本文: 胡培远, 李才, 解超明, 等. 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, 47(1): 52-60.
HU Pei-yuan, LI Cai, JIE Chao-ming, et al. Zircon U-Pb Dating and Hf-isotope Compositions of Granodiorite From the Guoganjianian Mountain Area, Central Qiangtang, Northern Tibet, China[J]. Northwestern Geology, 2014, 47(1): 52-60.
Citation: HU Pei-yuan, LI Cai, JIE Chao-ming, et al. Zircon U-Pb Dating and Hf-isotope Compositions of Granodiorite From the Guoganjianian Mountain Area, Central Qiangtang, Northern Tibet, China[J]. Northwestern Geology, 2014, 47(1): 52-60.

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

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

详细信息
    作者简介:

    胡培远(1987- ),男,博士研究生,构造地质学专业。E-mail:azure_jlu@126.com

  • 中图分类号: P597

Zircon U-Pb Dating and Hf-isotope Compositions of Granodiorite From the Guoganjianian Mountain Area, Central Qiangtang, Northern Tibet, China

  • 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1874~2372 Ma,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。
    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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出版历程
  • 收稿日期:  2014-01-03
  • 修回日期:  2014-02-26
  • 网络出版日期:  2022-07-28
  • 发布日期:  2014-03-04

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