| 北秦岭太白花岗岩体LA-ICP-MS锆石U-Pb测年及其地质意义 |
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| 引用本文： | 吕星球,王晓霞,柯昌辉,李金宝,杨阳,孟旭阳,聂政融,章培春.北秦岭太白花岗岩体LA-ICP-MS锆石U-Pb测年及其地质意义[J].矿床地质,2014,33(1):37-52. |
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| 作者姓名： | 吕星球 王晓霞 柯昌辉 李金宝 杨阳 孟旭阳 聂政融 章培春 |
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| 作者单位： | 中国地质大学, 北京 100083;中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室, 北京 100037;中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室, 北京 100037;中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室, 北京 100037;长安大学地球科学与资源学院, 陕西 西安 710054;中国地质大学, 北京 100083;中国地质大学, 北京 100083;中国地质大学, 北京 100083;中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室, 北京 100037;中国地质大学, 北京 100083;内蒙古自治区地质调查院, 内蒙古 呼和浩特 010020 |
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| 基金项目： | 本文得到地质调查项目（编号：1212010012012、1212010811033和12120113090200）的资助 |
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| 摘 要： | 北秦岭太白岩体位于商丹构造带北侧。野外侵入关系和LA-ICP-MS锆石U-Pb定年显示，该岩体由早志留世的五里峡岩体、晚三叠世的红崖河岩体和早白垩世的下板寺岩体组成。五里峡岩体的主要岩石类型为片麻状黑云母二长花岗岩，锆石U-Pb年龄为（431±2） Ma；红崖河岩体的主要岩石类型为黑云母二长花岗岩，锆石U-Pb年龄为（214±2） Ma；下板寺岩体为粗粒黑云母花岗岩，锆石U-Pb年龄为（130±1） Ma，表明太白岩体是由3个不同时代岩体组成的侵入复合杂岩体。结合区域构造背景和前人的研究成果，得出早志留世五里峡岩体可能与秦岭微板块沿商丹缝合带俯冲碰撞有关；晚三叠世红崖河岩体与秦岭早中生代主期岩浆作用一致，是华北地块与扬子地块碰撞的产物；燕山期的下板寺花岗岩属于板内岩浆作用。研究显示，今后应注意大岩体的解体，其可能隐含着不可忽视的构造-岩浆作用信息。
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| 关 键 词： | 地球化学 锆石U-Pb测年 花岗岩 商丹构造带 北秦岭 |
| 收稿时间： | 2013/12/20 0:00:00 |
| 修稿时间： | 1/1/2014 12:00:00 AM |
LA-ICP-MS zircon U-Pb dating of Taibai pluton in North Qinling Mountains and its geological significance |
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| L&#; XingQiu,WANG XiaoXi,KE ChangHui,LI JinBao,YANG Yang,MENG XuYang,NIE ZhengRong and ZHANG PeiChun.LA-ICP-MS zircon U-Pb dating of Taibai pluton in North Qinling Mountains and its geological significance[J].Mineral Deposits,2014,33(1):37-52. |
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| Authors: | L&#; XingQiu WANG XiaoXi KE ChangHui LI JinBao YANG Yang MENG XuYang NIE ZhengRong and ZHANG PeiChun |
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| Institution: | China University of Geosciences, Beijing 100083, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China;China University of Geosciences, Beijing 100083, China;China University of Geosciences, Beijing 100083, China;China University of Geosciences, Beijing 100083, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;China University of Geosciences, Beijing 100083, China;Geological Institute of Inner Mongolia, Hohhot 010020, Inner Mongolia, China |
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| Abstract: | The Taibai pluton is located on the northern side of Shangdan suture in the North Qinling Mountains. Field relationship and LA-ICP-MS zircon U-Pb dating suggest that this rock body consists of the early Silurian Wulixia pluton, the late Triassic Honyahe pluton and the early Cretaceous Xiabansi pluton. The main rock type of the Wulixia pluton is gneissic biotite monzogranite with an age of (431±2) Ma, the Honyahe pluton is biotite monzogranite with an age of (214±2) Ma and the Xiabansi pluton is coarse-grained biotite granite with an age of (130±1) Ma. These ages suggest that Taibai pluton has experienced at least three tectonic-magmatic events. According to regional tectonic setting and previous researches, the Wulixia pluton was related to the subduction and collision of the micro plate of Qinling Mountains along Shandan suture, the Honyahe pluton was formed by the collision of the North China Block with the Yangtze Block, and the Xiabansi pluton belonged to intraplate magmatism. It is thus thought that big batholith might contain more information of tectono-magmatic activities. |
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| Keywords: | geochemistry zircon U-Pb dating granite Shangdan suture North Qinling |
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