| 华北古元古代末裂解事件——来自内蒙古大青山地区安山岩LA-ICP-MS锆石U-Pb年龄的证据 |
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| 引用本文： | 郭俊, 马富财, 杨文, 程俊, 成林强, 郭雪峰. 华北古元古代末裂解事件——来自内蒙古大青山地区安山岩LA-ICP-MS锆石U-Pb年龄的证据[J]. 地质通报, 2017, 36(2-3): 314-320. |
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| 作者姓名： | 郭俊 马富财 杨文 程俊 成林强 郭雪峰 |
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| 作者单位： | 1.陕西区域地质矿产研究院, 陕西 咸阳 712000; 2.中国地质大学(北京)地球科学与资源学院, 北京 100083 |
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| 基金项目： | 内蒙古自治区地质勘查基金管理中心项目《内蒙古呼和浩特市庙沟等四幅1∶5 万区域地质调查》（编号：NMKD2013-23） |
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| 摘 要： | 在内蒙古大青山地区1∶5 万矿产资源调查中，采用LA-ICP-MS 锆石U-Pb 同位素测年，在一套侏罗纪火山岩中获得锆石U-Pb 年龄加权平均值为1863±10Ma。经野外实测，认为其被上二叠统脑包沟组不整合覆盖。结合岩石主量、稀土和微量元素测试结果进行构造环境分析，认为其为陆内裂谷环境的产物，反映了华北古元古代末—中元古代多期裂谷事件中的一次裂解事件，对华北古元古代末多期裂谷事件的研究具有重要意义，为华北克拉通进入地台型演化的时间提供了重要依据。
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| 关 键 词： | LA-ICP-MS 锆石U-Pb 年龄 多期裂谷事件 华北克拉通 大青山地区 内蒙古 |
| 收稿时间： | 2015-11-19 |
| 修稿时间： | 2015-12-10 |
Late Paleoproterozoic breakup events of North China: Evidence from LA-ICP-MS zircon U-Pb ages of basaltic andesite from the Daqingshan area in Inner Mongolia |
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| GUO Jun, MA Fucai, YANG Wen, CHENG Jun, CHENG Linqiang, GUO Xuefeng. Late Paleoproterozoic breakup events of North China: Evidence from LA-ICP-MS zircon U-Pb ages of basaltic andesite from the Daqingshan area in Inner Mongolia[J]. Geological Bulletin of China, 2017, 36(2-3): 314-320. |
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| Authors: | GUO Jun MA Fucai YANG Wen CHENG Jun CHENG Linqiang GUO Xuefeng |
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| Affiliation: | 1.Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, xianyang 712000, Shaanxi, China; 2.School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | During the 1∶50000 regional geological survey in Daqingshan area of Inner Mongolia, the authors used LA-ICP-MS zircon U-Th-Pb isotopic dating method and obtained weighted average zircon U-Pb age of 1863±10Ma from the Jurassic volcanic rock. The contact relation is considered to be unconformably covered by Upper Permian Naobaogou Formation, as shown by field survey. According to the major, trace and rare earth elements analytical results of the rock, the basaltic andesite was formed in an intracontinental rift. This was a breakup event between multi -stage rifting in the Late Paleoproterozoic to Neoproterozoic in North China. It is of great significance for studying multi-stage rifting and provides an important basis for the North China Craton (NCC) evolution as a stable platform or para-platform. |
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| Keywords: | LA-ICP-MS zircon U-Pb age multi-stage rifting NCC Daqingshan area Inner Mongolia |
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