| 西藏桑耶寺北岗结则雄花岗闪长岩体年代学、地球化学特征及地质意义 |
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| 引用本文： | 武雪梅,张志平,雒晓刚,周彦慧,刘晓涛,汪宏涛,王晓东.西藏桑耶寺北岗结则雄花岗闪长岩体年代学、地球化学特征及地质意义[J].矿产勘查,2019(6):1339-1350. |
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| 作者姓名： | 武雪梅 张志平 雒晓刚 周彦慧 刘晓涛 汪宏涛 王晓东 |
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| 作者单位： | 甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050 |
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| 基金项目： | 中国地质调查局项目(编号:121201010000150014-46、DD20160015-08)联合资助。 |
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| 摘 要： | 桑耶寺北岗结则雄花岗闪长岩体位于冈底斯岩浆岩带中段,为确定该花岗闪长岩的形成时代、源区性质和构造背景,对其进行了LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究。结果显示岩体侵位时间为50. 29±0. 42Ma,属于始新世。岩石SiO_2含量为58. 31%~62. 3%,Na_2O、K_2O含量分别为3. 08%~3. 57%和2. 59%~3. 56%,岩石碱值NK/A为0. 51%~0. 59%,铝饱和指数A/CNK为0. 85%~1. 06%,属准铝质-过铝质系列岩石。稀土元素分布模式为轻稀土富集,负Eu异常明显。岩石富集大离子亲石元素Rb、Ba、K、U、Th,亏损高强场元素Nb、P、Ti等。以上特征表明,岩石为高钾钙碱性的I型花岗岩,结合岩石成岩年龄、地球化学特征以及区域构造演化,岗结则雄花岗闪长岩岩浆源区为下地壳基性岩部分熔融的产物,是印度-欧亚板块碰撞过程中一复杂地质过程的岩浆作用产物,可能与新特提斯洋板片回转有关。
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| 关 键 词： | Ⅰ型花岗岩 地球化学特征 锆石U-Pb 板片回转 桑耶寺北 |
| 收稿时间： | 2019/1/10 0:00:00 |
The chronology, geochemical characteristics and geological significance of the Granodiorite in gangjiezexiong, north of sangye temple, Tibet |
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| WU Xue-mei,ZHANG Zhi-ping,LUO Xiao-gang,ZHOU Yan-hui,LIU Xiao-tao,WANG Hong-tao and WANG Xiao-dong.The chronology, geochemical characteristics and geological significance of the Granodiorite in gangjiezexiong, north of sangye temple, Tibet[J].Mineral Exploration,2019(6):1339-1350. |
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| Authors: | WU Xue-mei ZHANG Zhi-ping LUO Xiao-gang ZHOU Yan-hui LIU Xiao-tao WANG Hong-tao and WANG Xiao-dong |
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| Affiliation: | The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050 and The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050 |
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| Abstract: | |
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| Keywords: | I type granodiorite geochemical characteristics zircon U-Pb plate rotation north of sangye temple |
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