| 额尔古纳地块八卡地区岩浆作用及其构造意义 |
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| 引用本文： | 迟瀚韬,密文天,席忠,白泳,武景龙,辛杰,王安迪.额尔古纳地块八卡地区岩浆作用及其构造意义[J].地质找矿论丛,2019,34(3):383-392. |
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| 作者姓名： | 迟瀚韬 密文天 席忠 白泳 武景龙 辛杰 王安迪 |
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| 作者单位： | 成都理工大学国土资源部地学空间信息技术重点实验室,成都610059;成都理工大学数学地质四川省重点实验室,成都610059;内蒙古工业大学矿业学院,呼和浩特010051;中国地质大学地球科学与资源学院,北京100083;成都理工大学国土资源部地学空间信息技术重点实验室,成都610059;成都理工大学数学地质四川省重点实验室,成都610059;内蒙古工业大学矿业学院,呼和浩特010051;内蒙古自治区第一地质矿产勘查开发院,呼和浩特,010020;中国科学院新疆分院,乌鲁木齐,830011;内蒙古工业大学矿业学院,呼和浩特,010051 |
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| 基金项目： | 中国地质大学构造与油气资源教育部重点实验室开放课题（编号：TPR-2017-13）、中南大学有色金属成矿预测与地质环境监测教育部重点实验室开放基金（编号：2017YSJS06）、西南石油大学天然气地质四川省重点实验室开放基金（编号：2016trqdz08）、内蒙古工业大学科学研究重点项目（编号：ZD201322）、内蒙古工业大学教材建设项目（编号：JC201712）、国土资源部地学空间信息技术重点实验室开放基金（编号：KLGSIT2016-02）、数学地质四川省重点实验室开放基金（编号：scsxdz201602）、内蒙古自然科学基金（编号：2018LH04006）联合资助。 |
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| 摘 要： | 通过对额尔古纳八卡地区酸性侵入岩进行LA-ICP-MS锆石U-Pb定年研究表明，八卡区内5个代表性的酸性侵入岩体中的锆石大部分为自形-半自形晶，显示其为岩浆成因锆石；岩浆作用集中于3个阶段。其包括：1）新元古代早期岩浆活动，正长花岗岩加权平均年龄为798 Ma±6 Ma，其形成可能与Rodinia超大陆裂解的构造背景有关；2）晚二叠世-早三叠世的岩浆活动，岩石年龄介于238~267 Ma，结合花岗岩特征，反映其形成于古亚洲洋闭合后的造山后环境；3）花岗岩的138 Ma±1 Ma、137 Ma±2 Ma岩体年龄显示了早白垩世岩浆作用的存在，该岩浆事件与蒙古-鄂霍茨克缝合带的演化有关。
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| 关 键 词： | 古亚洲构造域 额尔古纳地块 地质年代学 岩浆岩 构造环境 |
| 收稿时间： | 2018/7/31 0:00:00 |
Magmatism in Baka of the Erguna Massif and its tectonic significance |
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| CHI Hantao,MI Wentian,XI Zhong,BAI Yong,WU Jinglong,XIN Jie and WANG Andi.Magmatism in Baka of the Erguna Massif and its tectonic significance[J].Contributions to Geology and Mineral Resources Research,2019,34(3):383-392. |
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| Authors: | CHI Hantao MI Wentian XI Zhong BAI Yong WU Jinglong XIN Jie and WANG Andi |
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| Institution: | Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources, Chengdu University of technology, Chengdu 610059, China;Geomathematics Key Laboratory of Sichuan Province, Chengdu University of technology, Chengdu 610059, China;School of mines, Inner Monglia University of Technology, Hohhot 010051, China;School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China,Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources, Chengdu University of technology, Chengdu 610059, China;Geomathematics Key Laboratory of Sichuan Province, Chengdu University of technology, Chengdu 610059, China;School of mines, Inner Monglia University of Technology, Hohhot 010051, China,No.1 Geological Party of Inner Mongolia Bureau of Geology and Mineral Resources Exploration and Development, Hohhot 010020, China,Xinjiang Branch, Chinese Academy of Sciences, Urumqi 830011, China,No.1 Geological Party of Inner Mongolia Bureau of Geology and Mineral Resources Exploration and Development, Hohhot 010020, China,School of mines, Inner Monglia University of Technology, Hohhot 010051, China and School of mines, Inner Monglia University of Technology, Hohhot 010051, China |
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| Abstract: | Zircons from the 5 representative acidic intrusive bodies in Baka area are generally idiomorphic or hypidiomorphic crystals from magma. Data of LA-ICP-MS zircon U-Pb dating of the acidic intrusive rocks are concentrated in 3 stages. The first stage is early Neoproterozoic orthoclase granite with the weighted average age of 798 Ma±6 Ma which is related to the geological event of disintegration of Rodinia supercontinent. The second stage is 242 to 265 Ma, the late Permian-Early Triassic period and the magmatism took place under the post-orogenic environment after the closure of the Paleo-Asian oceanaccording to characteristics of the granite. The third stage is is 138 Ma±1 Ma and 137 Ma±2 Ma corresponding to early Cretaceous Epoch related to the evolution of the Mongolian-Okhotsk suture zone. |
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| Keywords: | Paleo-Asiantectonic realm Erguna Massif geochronology magmatic rock tectonic setting |
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