| 青海南山俯冲型侵入体LA-ICP-MS锆石U-Pb定年及其地质意义 |
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| 引用本文： | 田淇,石玉莲,郝亚青,强晓农,李生虎. 青海南山俯冲型侵入体LA-ICP-MS锆石U-Pb定年及其地质意义[J]. 地质通报, 2018, 37(7): 1258-1270 |
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| 作者姓名： | 田淇 石玉莲 郝亚青 强晓农 李生虎 |
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| 作者单位： | 吉林大学地球科学院;青海省第五地质矿产勘查院 |
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| 基金项目： | 中国地质调查局项目《青海省共和县东巴地区三幅1：5万区域地质矿产调查》（编号：12120113033020） |
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| 摘 要： | 青海南山侵入体岩石类型为二长花岗岩、花岗闪长岩及英云闪长岩,具俯冲型花岗岩类的地球化学特征。通过高精度的LA-ICP-MS(激光剥蚀等离子体质谱)单颗粒锆石微区U-Pb同位素年龄测定,分别在二长花岗岩、花岗闪长岩及英云闪长岩中获得446.1±3.5Ma、447.2±5.3Ma、443.6±8.6Ma的锆石U-Pb年龄值,为成岩年龄,代表了加里东运动在祁连造山带的地质记录。3种不同岩石类型的成岩年龄可能代表了拉脊山造山带向南俯冲的时代。青海南山地区俯冲型侵入体的形成时代及构造环境的确定,对研究拉脊山造山带的构造演化及动力学机制具有重要意义。
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| 关 键 词： | 青海南山 俯冲型侵入体 LA-ICP-MS锆石U-Pb定年 构造意义 |
| 收稿时间： | 2017-04-20 |
| 修稿时间： | 2017-10-09 |
LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance |
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| TIAN Qi,SHI Yulian,HAO Yaqing,QIANG Xiaonong and LI Shenghu. LA-ICP-MS zircon U-Pb dating of Nanshan subduction type intrusion in Qinghai Province and its geological significance[J]. Geologcal Bulletin of China, 2018, 37(7): 1258-1270 |
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| Authors: | TIAN Qi SHI Yulian HAO Yaqing QIANG Xiaonong LI Shenghu |
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| Affiliation: | College of Earth Science, Jilin University, Changchun 130061, Jilin, China;No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi''ning 810099, Qinghai, China,No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi''ning 810099, Qinghai, China,No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi''ning 810099, Qinghai, China,No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi''ning 810099, Qinghai, China and No.5 Geological and Mineral Survey Institute of Qinghai Province, Xi''ning 810099, Qinghai, China |
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| Abstract: | The Nanshan intrusion consists of monzonitic granite, granodiorite and tonalite, geochemically belonging to subduction type granite. The high precision LA-ICP-MS denudation plasma mass spectrometry (laser) single particle zircon micro area U-Pb isotopic dating yielded 446.1±3.5Ma, 447.2±5.3Ma, and 443.6±8.6Ma for monzonitic granite, granodiorite and tonalite, respectively, which indicates the Caledonian movement in the Qilian orogenic belt in the geological record. The rock-forming ages of the three different types of rocks may represent southward subduction of the Lajishan orogenic belt. The determination of the rock-forming epoch and tectonic environment of the Nanshan subduction type intrusion is of great significance for the tectonic evolution and dynamics mechanism of the Lajishan orogenic belt. |
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| Keywords: | Nanshan in Qinghai Province subduction type intrusion LA-ICP-MS zircon U-Pb dating tectonic significance |
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