| 内蒙古图古日格金矿床二叠纪侵入岩锆石U-Pb年龄与地球化学特征 |
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| 引用本文： | 丁成武,戴盼,聂凤军,张照录,彭云彪,张更信,李大鹏,申颖.内蒙古图古日格金矿床二叠纪侵入岩锆石U-Pb年龄与地球化学特征[J].岩石矿物学杂志,2021,40(2):236-256. |
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| 作者姓名： | 丁成武 戴盼 聂凤军 张照录 彭云彪 张更信 李大鹏 申颖 |
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| 作者单位： | 山东理工大学 资源与环境工程学院, 山东 淄博 255000;中国地质科学院 矿产资源研究所, 北京 100037;核工业208大队, 内蒙古 包头 014010;山东省地质科学研究院, 山东 济南 250013 |
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| 基金项目： | 国家自然科学基金资助项目（42002099，41973048）；山东省自然科学基金青年基金（ZR2018QD002）；山东省重点研发计划项目（2019GSF109101）；山东省地质勘查项目（SDGP370000202002001782） |
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| 摘 要： | 对内蒙古图日格金矿区内的侵入岩开展了地质年代学和地球化学研究。LA-ICP-MS锆石U-Pb测年结果表明,图古日格矿区内的似斑状花岗岩、花岗岩、角闪石岩和蚀变闪长岩的成岩年龄分别为264.5±1.4 Ma、278.7±1.0Ma、280.6±1.3 Ma和288.0±2.6 Ma,均侵位于二叠纪。图古日格金矿床的成矿年龄(268～259 Ma)与矿区内的似斑状花岗岩的活动时间(276～265 Ma)相似,而且矿床的矿体均产出在似斑状花岗岩中或附近,指示它们之间可能具有密切的成因联系。图古日格金矿床内的二叠纪侵入岩为一套双峰式侵入岩,矿区内的侵入岩都属于高钾钙碱性系列,均具有富集大离子亲石元素(Rb、K、Sr、Pb等)、亏损高场强元素(Nb、Ta、Ti等)、轻稀土元素较富集和轻重稀土元素分异程度较低的特点。这些侵入岩虽然具有类似俯冲带侵入岩的地球化学特征,但这可能仅仅反映了岩石源区受到了俯冲作用的影响,不足以制约其构造背景。结合前人研究成果和双峰式侵入岩组合的地球化学特征,认为图古日格金矿床及矿区内的二叠纪侵入岩形成的构造背景是碰撞后伸展环境。
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| 关 键 词： | LA-ICP-MS锆石U-Pb定年 碰撞后伸展 二叠纪 侵入岩 图古日格 兴蒙造山带 |
| 收稿时间： | 2020/11/3 0:00:00 |
Zircon U-Pb ages and geochemical characteristics of the Permian intrusive rocks in the Tugurige gold deposit in Inner Mongolia |
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| DING Cheng-wu,DAI Pan,NIE Feng-jun,ZHANG Zhao-lu,PENG Yun-biao,ZHANG Geng-xin,LI Da-peng,SHEN Ying.Zircon U-Pb ages and geochemical characteristics of the Permian intrusive rocks in the Tugurige gold deposit in Inner Mongolia[J].Acta Petrologica Et Mineralogica,2021,40(2):236-256. |
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| Authors: | DING Cheng-wu DAI Pan NIE Feng-jun ZHANG Zhao-lu PENG Yun-biao ZHANG Geng-xin LI Da-peng SHEN Ying |
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| Institution: | School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;No. 208 Geological Party, China National Nuclear Corporation, Baotou 014010, China;Shandong Institute of Geological Sciences, Jinan 250013, China |
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| Abstract: | The Tugurige gold deposit is located in the western part of the Xing''an-Mongolia Orogenic Belt (XMOB). This paper describes the geochronologic and petrological-geochemical data of the intrusive rocks in the Tugurige gold deposit. The LA-ICP-MS U-Pb dating of zircons from syenogranite, granite, hornblendite and diorite in the Tugurige gold deposit yielded weighted mean 206Pb/238U ages of 264.5±1.4 Ma, 278.7±1.0 Ma, 280.6±1.3 Ma and 288.0±2.6 Ma respectively. The results show that the ages of gold mineralization (268~259 Ma) and syenogranite (276~265 Ma) are the same within error. Geological and geochronological evidence indicates that the syenogranite and gold mineralization have very close genetic relationships. The intrusive rocks in the Tugurige gold deposit are bimodal intrusive rocks, and belong to the high K calc-alkaline series. They are characterized by enrichment of large ion lithophile (Rb, Pb, K, Sr) and light rare earth elements (LREE) and depletion of high field strength elements (Nb, Ta, P, Ti). The intrusive rocks in the Tugurige gold deposit have some geochemical characteristics of the intrusive rocks in the subduction zone. This indicates that the source of these intrusive rocks was probably altered or affected by subduction events, but can not constrain their geological background. Combined with geological data available, the authors hold that the intrusions and gold mineralization in the Tugurige area were related to post-collisional extension of the Central Asian Orogenic Belt (CAOB). |
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| Keywords: | LA-ICP-MS zircon U-Pb dating post-collisional extension Permian intrusive rocks Tugurige Xing-Meng Orogenic Belt |
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