| 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义 |
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| 引用本文： | 温志刚,王洪强,杜尧,刘松柏,王嘉伟. 新疆西准噶尔业姆奇花岗岩体形成时代及其构造意义[J]. 地质通报, 2019, 38(8): 1297-1305 |
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| 作者姓名： | 温志刚 王洪强 杜尧 刘松柏 王嘉伟 |
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| 作者单位： | 陕西地矿区研院有限公司, 陕西 咸阳 712000,陕西地矿区研院有限公司, 陕西 咸阳 712000,西安科技大学, 陕西 西安 710054,陕西地矿第三地质队有限公司, 陕西 宝鸡 721300,陕西地矿区研院有限公司, 陕西 咸阳 712000 |
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| 基金项目： | 中国地质调查局项目《新疆1：25万捷尔任斯克幅、托里县幅区调修测》（编号：1212010911056）和《新疆1：5万老裕民等七幅区调》（编号：1212011120507） |
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| 摘 要： | 对新疆西准噶尔南部地区与早古生代蛇绿岩紧密伴生的业姆奇花岗岩体岩石学、岩石地球化学、同位素年代学进行研究,认为业姆奇花岗岩为低钾(拉斑)系列,岩石地球化学特征具板内靠近岛弧区域特征。通过对二长花岗岩LA-ICP-MS锆石U-Pb测年,获得比较准确的年龄数据539.7±2.6Ma,表明其形成时代为早寒武世,该侵入岩作为西准噶尔地区最老的岩浆活动产物,代表了在诺丁尼亚统一大陆形成之后早期裂解阶段古洋盆初期的地质记录。
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| 关 键 词： | 西准噶尔 花岗岩 LA-ICP-MS锆石U-Pb年龄 构造意义 |
| 收稿时间： | 2018-01-13 |
| 修稿时间： | 2018-04-04 |
The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang |
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| WEN Zhigang,WANG Hongqiang,DU Yao,LIU Songbai and WANG Jiawei. The formation age and tectonic significance of Yemuqi granite in West Junggar, Xinjiang[J]. Geologcal Bulletin of China, 2019, 38(8): 1297-1305 |
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| Authors: | WEN Zhigang WANG Hongqiang DU Yao LIU Songbai WANG Jiawei |
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| Affiliation: | Shaanxi Geology and Mineral Research Institute Co., Ltd., Xianyang 712000, Shaanxi, China,Shaanxi Geology and Mineral Research Institute Co., Ltd., Xianyang 712000, Shaanxi, China,Xi''an University of Science and Technology, Xi''an 710054, Shaanxi, China,Shaanxi Geological and Mineral Third Party Co., Ltd., Baoji 721300, Shaanxi, China and Shaanxi Geology and Mineral Research Institute Co., Ltd., Xianyang 712000, Shaanxi, China |
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| Abstract: | In this paper, the petrology, lithogeochemistry, and isotope chronology of Yemuqi granite closely associated with Early Paleozoic granite in the southern part of West Junggar, Xinjiang, were studied in detail. It is considered that the granite belongs to low potassium (tholeiitic) series. The rock geochemistry shows the characteristics of the intraplate close to island arc region. The authors obtained accurate age data of 539.7±2.6Ma by LA-ICP-MS zircon U-Pb dating of the monzonite granite. It is shown that the age of its formation was Early Cambrian. The intrusive rock is the oldest product of magmatic activity in the West Junggar area, which represents the geological record of the early stage of the splitting in the Early Paleoceanic Basin after the formation of the united continent of Nodingnia. |
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| Keywords: | West Junggar granite LA-CP-MS zircon U-Pb age tectonic significance |
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