| 西准噶尔吾尔喀什尔山库鲁木苏岩基解体的锆石U-Pb年代学证据 |
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| 引用本文： | 张胜龙,李永军,焦光磊,易善鑫,孙勇,杨洋,王军年.西准噶尔吾尔喀什尔山库鲁木苏岩基解体的锆石U-Pb年代学证据[J].岩石矿物学杂志,2014,33(6):1073-1085. |
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| 作者姓名： | 张胜龙 李永军 焦光磊 易善鑫 孙勇 杨洋 王军年 |
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| 作者单位： | 长安大学地球科学与资源学院;新疆维吾尔族自治区地质矿产开发局第七地质大队; |
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| 基金项目： | 中国地质调查局地质矿产调查评价专项(1212011120516);中央高校基本科研业务费专项资金(2014G1271058) |
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| 摘 要： | 尽管岩石学特征和接触关系标志是岩基解体的最直接、最重要的证据,但不同序列的精确同位素定年则是对岩基解体证据的重要补充。库鲁木苏岩基可解体为库鲁木苏序列和沙雀序列,野外可见库鲁木苏序列呈脉状穿入沙雀序列,在库鲁木苏序列中沙雀序列呈捕掳体被包裹,地球化学特征表明二者无演化亲缘关系。高精度LAICP-MS测年获得库鲁木苏序列年龄291.5±2.9 Ma和290.9±2.9 Ma,获得沙雀序列年龄304.9±2.5 Ma和304.1±2.9 Ma,表明二者是两期岩浆事件的产物,为库鲁木苏岩基的解体提供了年代学证据。库鲁木苏岩基的解体,不仅客观反映了岩浆的分布及活动特征,而且对进一步研究岩浆事件和构造演化具有重要的意义。
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| 关 键 词： | 西准噶尔 库鲁木苏岩基 LA-ICP-MS锆石U-Pb年龄 解体 |
| 收稿时间： | 2014/4/11 0:00:00 |
| 修稿时间： | 2014/10/16 0:00:00 |
Zircon U-Pb geochronological evidence of the disintegration of the Kulumusu granitic batholith in Wuerkashier, West Junggar Basin |
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| ZHANG Sheng-long,LI Yong-jun,JIAO Guang-lei,YI Shan-xin,SUN Yong,YANG Yang and WANG Jun-nian.Zircon U-Pb geochronological evidence of the disintegration of the Kulumusu granitic batholith in Wuerkashier, West Junggar Basin[J].Acta Petrologica Et Mineralogica,2014,33(6):1073-1085. |
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| Authors: | ZHANG Sheng-long LI Yong-jun JIAO Guang-lei YI Shan-xin SUN Yong YANG Yang and WANG Jun-nian |
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| Institution: | Earth Science and Resources College, Chang''an University, Xi''an 710054, China;Earth Science and Resources College, Chang''an University, Xi''an 710054, China;Earth Science and Resources College, Chang''an University, Xi''an 710054, China;Earth Science and Resources College, Chang''an University, Xi''an 710054, China;Earth Science and Resources College, Chang''an University, Xi''an 710054, China;Earth Science and Resources College, Chang''an University, Xi''an 710054, China;No. 7 Geological Survey Party, Xinjiang Bureau of Geology and Mineral Resource Exploration, Wusu 833000, China |
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| Abstract: | While petrologic characteristics and contact relations constitute the most direct and important evidence of the disintegration of granitic batholith, the accurate isotopic ages of the different series are important supplementary data. The Kulumusu granitic batholith is composed of Kulumusu and Shaque series. Detailed field investigation shows that the vein from Kulumusu series intruded into Shaque series. In addition, xenoliths of Shaque series are distributed in Kulumusu series. High-precision LA-ICP-MS zircon U-Pb dating of the Kulumusu series indicates that the weighted mean 206Pb/238U ages are 291.5±2.9 Ma and 290.9±2.9 Ma, and those of the Shaque series are 304.9±2.5 Ma and 304.1±2.9 Ma. The ages of the two series show that they were formed in different magma intrusion events, and the data obtained provide geochronological evidence for disintegration of the Kulumusu granitic batholith. The disintegration of the Kulumusu batholith not only provides new information on the geological features and facts of magmatic movements, but also is of significance and theoretical value in studying the tectonic evolution of this region. |
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| Keywords: | West Junggar Kulumusu batholiths zircon LA-ICP-MS U-Pb age disintegration |
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