| 内蒙古图古日格金矿床绢云母40Ar-39Ar定年及其地质意义 |
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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,亓辉,申颖.2022.内蒙古图古日格金矿床绢云母40Ar-39Ar定年及其地质意义[J].地球学报,43(4):542-554. |
| DOI：10.3975/cagsb.2021.110701 |
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| 基金项目:国家自然科学基金青年基金项目(编号: 42002099);山东省自然科学基金青年基金项目(编号: ZR2018QD002; ZR2020QD031);山东省重点研发计划项目(编号: 2019GSF109101);山东省地质勘查项目(编号: SDGP370000202002001782) |
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| 中文摘要:图古日格金矿床是位于兴蒙造山带西端的一个大型金矿床, 矿床的矿石主要有石英脉型和蚀变岩型两种, 矿床的成矿年龄尚存在争议。本文对矿床蚀变岩型矿石中热液成矿阶段的绢云母进行了40Ar-39Ar同位素定年研究, 获得坪年龄为(258.9±1.6) Ma(MSWD=0.69), 等时线年龄为(259.2±2.9) Ma(MSWD=5.4), 与前人获得的黄铁矿Re-Os等时线年龄((268±15) Ma)在误差范围内完全一致。结合矿区地质事实及前人研究结果, 认为该矿床的成矿年龄可以限定在268~259 Ma。图古日格金矿床与矿区内的似斑状花岗岩(265 Ma)具有紧密的成因关系, 属于与花岗质岩浆活动有关的石英脉型金矿床。兴蒙造山带乃至整个中亚造山带, 可能在二叠纪时期发育有一次与伸展背景下花岗质岩浆活动有关的金成矿事件, 找矿潜力巨大。 |
| 中文关键词:图古日格金矿 40Ar-39Ar定年 绢云母 兴蒙造山带 二叠纪 |
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| 40Ar-39Ar Age of Sericite from the Tugurige Gold Deposit in Inner Mongolia and Its Geological Significance |
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| Abstract:The Tugurige gold deposit, which is located in the western part of the Xing'an–Mongolia Orogenic Belt (XMOB), is a large tonnage gold deposit. The gold mineralization of this deposit can be divided into sulfide quartz-vein and altered host rock types. However, the age of the gold mineralization remains controversial. In this paper, 40Ar-39Ar dating was carried out on the sericite from altered ores of the main mineralization stage, yielding a plateau age of (258.9±1.6) Ma (MSWD=0.69) and a isochronal age of (259.2±2.9) Ma (MSWD=5.4), which are consistent with the pyrite Re-Os age ((268±15) Ma) reported by other geologists. Combined with regional geological background and previous studies on Tugurige gold deposit, we suggest that the metallogenic age of the Tugurige gold deposit is (268–259) Ma. The syenogranite (265 Ma) and gold mineralization of the Tugurige gold deposit were found to have very close genetic relationships, indicating that this deposit is a magmatic hydrothermal gold deposit. The Permian is an important period in which economic gold mineralization associated with granitic magmatism was deposited in the XMOB. |
| keywords:Tugurige gold deposit 40Ar-39Ar dating sericite Xing'an–Mongolia Orogenic Belt Permian |
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