| 侯万荣.内蒙古哈达门沟金矿床成矿年代学研究[J].地质与勘探,2014,50(Z1):1213-1223 |
| 内蒙古哈达门沟金矿床成矿年代学研究 |
| Mineralization epochs of the Hadamengou gold (molybdenum) deposit in Inner Mongolia |
| 投稿时间：2014-03-28 修订日期：2014-09-16 |
| DOI： |
| 中文关键词: 哈达门沟金矿床 辉钼矿Re-Os同位素年龄 华北板块北缘 内蒙古 |
| 英文关键词: Hadamengou gold deposit, Re-Os isotopic age of molybdenite, northern margin of the North China block, Inner Mongolia |
| 基金项目:国家重点自然科学基金资助项目（编号：41030421）、危机矿山接替资源找矿项目（编号：20089948）、地质调查项目（编号：1212010911029）和基本业务费项目（编号： K1012）联合资助 |
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| 中文摘要: |
| 乌拉山-大青山成矿带为华北板块北缘重要的金多金属成矿带，其中产出有哈达门沟-柳坝沟大型金矿床，金矿床成矿时代和构造背景一直存在争议，长期被认为是中生代构造岩浆活动产物，最近在哈达门沟金矿床深部发现了与金共生的石英脉型和钾化蚀变岩型钼矿化，笔者等利用Re-Os同位素分析方法，首次对与含金黄铁矿共生的辉钼矿进行了年代学研究。4件辉钼矿Re-Os同位素等时线年龄为386.6±6.1Ma（MSWD=1.18），加权平均年龄为386.4±2.7Ma（MSWD=0.55），初始187Os值为-0.02±0.41 ng/g。根据辉钼矿的年龄，并且结合其它地质证据，可以推测，哈达门沟地区金矿化发生的事件可追溯到早泥盆世，属海西早期构造-岩浆活动事件，而矿区北部西沙德盖钼矿获得辉钼矿Re-Os年龄为226.4±3.3Ma，钼矿床形成于三叠纪，说明乌拉山地区内至少存在两期钼矿化，其中早期钼矿化与金矿化同时发生，且以金矿化为主，上述数据的取得，对重新认识该区金（钼）矿成矿作用及区域地质演化历史有着重要的理论和实际意义。 |
| 英文摘要: |
| The Wula Shan – Daqing Shan area, a major gold mineralization belt in the northern margin of the North China block, hosts the large Hadamegou-Liubagou gold-molybdenum deposit. Its ore-forming time and tectonic setting of the deposit remain a dispute, though it has long been considered the product of tectonic activity during the Mesozoic. Quartz vein-type and potassic alteration-type molybdenum mineralization paragenetic with gold was recently discovered at the depth below this deposit. This work employed the Re-Os isotopic method to make a chronological study of the molybdenite paragenetic with Au-bearing pyrite. Four samples of molybdenite yielded an isochrone age of 386.6±6.1 Ma (MSWD=1.18), with a weighted average of 386.4±2.7 Ma（MSWD=0.55）and an initial 187Os value of -0.02±0.41. Combined with other geological evidence, our results suggest that the gold mineralization at the Hadamengou area could date back to the Early Devonian, which indicates an event of tectonomagmatic activity occurring in the early Hercynian period. While the northern Hadamengou ore district, Xishadegai molybdenum deposit yielded molybdenite Re-Os isotopic age of 226.4±3.3Ma，with ore-forming age as Triassic. It indicates that the Wula Shan area has experienced two periods of molybdenum mineralization, among which the earlier molybdenum mineralization occurred coevally with gold mineralization that was dominant. The data acquired above are of importance for better understanding the gold mineralization and regional geological evolution of this area. |
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