| 王梁.内蒙武川后石花金矿床辉钼矿Re-Os同位素年龄及其地质意义[J].地质与勘探,2015,51(3):422-431 |
| 内蒙武川后石花金矿床辉钼矿Re-Os同位素年龄及其地质意义 |
| Re-Os dating of molybdenites from the Houshihua gold deposit in Wuchuan County, Inner Mongolia and its geological significance |
| 投稿时间：2014-12-02 修订日期：2015-03-02 |
| DOI： |
| 中文关键词: Re-Os同位素定年 辉钼矿 后石花金矿 华北北缘 |
| 英文关键词: Re-Os isotopic dating, molybdenite, Houshihua gold deposit, the northern margin of the North China Craton |
| 基金项目:中国地质调查局矿产资源远景调查评价项目（编号:1212011120725、12120113072200）资助的成果 |
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| 中文摘要: |
| 后石花金矿是华北克拉通北缘一小型石英脉型金矿床。对矿体5件辉钼矿样品的Re-Os同位素分析, 获得了介于280.3±3.8~283.0±3.9Ma，加权平均为282.0±1.8Ma（MSWD=0.28）的同位素模式年龄，以及一个相关性很好的等时线年龄281.9±1.8Ma（MSWD=0.57），表明矿床形成于早二叠世，推测是海西晚期古亚洲洋俯冲体制下陆缘弧背景中构造-热液成矿事件产物。综合区域资料认为，华北北缘中段在海西晚期曾发生过重要成矿作用，但多在后期被剥蚀破坏。华北北缘中段大陆弧范围内，叠加在前寒武纪结晶基底韧性剪切带之上的脆性断裂构造带，以及华北北缘早古生代增生带内部，是形成海西晚期金、钼矿床的有利部位。 |
| 英文摘要: |
| The Houshihua gold deposit is a small quartz vein-type deposit occurring in the northern margin of the North China Craton. Five molybdenite samples from this deposit yield the Re-Os isotopic model ages ranging from 280.3±3.8 to 283.0±3.9 Ma, with a weighted average age of 282.0±1.8 Ma (MSWD=0.28）and an isochron age of 281.9±1.8Ma (MSWD=0.57). This implies that the Au and Mo mineralization at this place occurred in early Permian, which was presumably the product of a tectono-hydrothermal event in a tectonic setting of a continental arc generated by the southward subduction of the ancient Asian ocean beneath the North China Craton in the late Hercynian period. Based on the regional geological data, it is inferred that a notable metallogenic event occurred during the late Hercynian period, which might be strongly modified or destroyed in later time. Probably Hercynian Au and Mo deposits had formed within brittle faults above ductile shear zones in the Precambian basement and in the early Paleozoic accretion belt along the northern margin of the North China Craton. |
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