| 湖南大义山矿田白沙子岭锡矿床Rb-Sr同位素等时线年龄及其地质意义 |
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| 引用本文： | 张晓军,罗华,吴志华,范先旺,熊俊,杨杰,牟金燚.湖南大义山矿田白沙子岭锡矿床Rb-Sr同位素等时线年龄及其地质意义[J].地球科学,2014,39(10):1322-1332. |
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| 作者姓名： | 张晓军 罗华 吴志华 范先旺 熊俊 杨杰 牟金燚 |
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| 作者单位： | 1.中国地质大学资源学院，湖北武汉 430074 |
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| 基金项目： | 中国地质调查局综合研究项目(No.12120113088800);湖南省国土资源厅科技发展计划项目 |
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| 摘 要： | 大义山矿田处于华南褶皱带南岭成矿带中段北缘，位于阳明山－大义山－上堡东西向基底断裂、攸县－宁远北东向基底断裂和郴州－邵阳北西向隐伏深断裂带的交汇部位，主要受大义山岩体控制，其中云英岩脉型锡矿为该矿田典型的成矿类型之一.对该矿田白沙子岭锡矿床云英岩脉型锡矿脉中的石英进行了流体包裹体Rb-Sr同位素测年及其地质意义的讨论.结果显示，矿脉中石英流体包裹体Rb-Sr同位素等时线年龄为160±1 Ma，属于南岭地区中生代160~150 Ma时段成矿高峰期产物；成矿与大义山岩体中侏罗世二长花岗岩具有密切的时间、空间和成因联系，为该期岩浆晚期热液成矿作用的产物；流体包裹体Rb-Sr同位素87Sr/86Sr初始比值为0.706 79±0.003 66，预示其成矿流体有幔源物质的参与，具有地壳和地幔混合流体的特征.
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| 关 键 词： | Rb-Sr 同位素 流体包裹体 二长花岗岩 地质年代学 矿床 |
| 收稿时间： | 2014-03-31 |
Rb-Sr Isochron Age and Its Geological Significance of Baishaziling Tin Deposit in Dayishan Ore Field,Hunan Province |
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| Abstract: | Dayishan ore field located in the north rim of the middle section of the Nanling metallogenic belt in South China fold zone, and at the intersection of Yangmingshan-Dayishan-Shangpu EW basement fault, Youxian-Ningyuan NE basement fault and Chenzhou-Shaoyang NW concealed deep fault, has been controlled by the Dayishan intrusive rock. The greisens-vein type tin deposit is one of the typical mineralization types in this ore field. The Rb-Sr geochronology of fluid inclusions in quartz of the ore veins is presented and its geological significance of the Baishaziling greisens-vein type tin deposit is discussed in this paper. The Rb-Sr isotopic dating of fluid inclusions of quartz is 160±1 Ma, which indicates that the tin deposit was likely formed in the peaks (160-150 Ma) of Mesozoic mineralization period of Nanling region, and the mineralization was closely related to the magmatic intrusion of the Middle Jurassic monzogranite of Dayishan intrusive rock, as a result of the post-magmatic hydrothermal mineralization. The initial 87Sr/86Sr value of the fluid inclusions is 0.706 79±0.003 66, which may indicate a mantle-derived fluid contribution to the ore-forming fluids. |
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