| 熊耳山沙坡岭钼矿辉钼矿Re-Os定年及东秦岭晚侏罗世钼矿化的识别 |
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| 引用本文： | 岳素伟,邓小华,姚军明,孙亚莉.熊耳山沙坡岭钼矿辉钼矿Re-Os定年及东秦岭晚侏罗世钼矿化的识别[J].岩矿测试,2017,36(3):305-317. |
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| 作者姓名： | 岳素伟 邓小华 姚军明 孙亚莉 |
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| 作者单位： | 华南理工大学广州学院 珠宝学院, 广东 广州 510800,北京矿产地质研究院, 北京 100012,中国科学院广州地球化学研究所, 广东 广州 510640,中国科学院广州地球化学研究所, 广东 广州 510640 |
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| 基金项目： | 国家自然科学基金资助项目（41202050， 41403032， 41630313， 41672079） |
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| 摘 要： | 河南沙坡岭矿床位于华北克拉通南缘的熊耳地体,产在燕山期花岗岩与围岩太华超群的外接触带,为东秦岭最近发现的细脉浸染型钼矿床。矿体受断裂或围岩裂隙控制,呈细脉、网脉状产出,矿石类型包括细脉状、浸染状和块状。为确定沙坡岭钼矿床成矿时代,本文利用辉钼矿Re-Os同位素定年,研究表明:采集的6件辉钼矿样品Re-Os单样年龄为158.3±1.5~160.7±1.2 Ma,其加权平均值为160±1 Ma(2σ误差,MSWD=2.1),指示沙坡岭钼矿化发生于晚侏罗世,且早于花山岩基约30 Ma,指示与花岗岩基无关。另外,一件产于花山复式岩体的团块状辉钼矿样品Re-Os单样年龄为130.5±1.0 Ma,与赋矿的花山岩体成岩时代一致,同样与前人报道的辉钼矿年龄(125.4~129.4 Ma)基本一致,且不存在明显的单颗粒辉钼矿187Os迁移,表明部分钼矿化形成于早白垩世。因此,辉钼矿Re-Os同位素定年显示沙坡岭矿床存在晚侏罗世和早白垩世两期钼矿化。结合矿床地质特征、成矿构造演化,认为沙坡岭钼矿与熊耳地体的花山岩基、花岗斑岩以及相关热液矿床,均属于秦岭造山带陆陆碰撞过程中挤压向伸展转变体制的产物。
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| 关 键 词： | 辉钼矿Re-Os定年 沙坡岭钼矿床 东秦岭钼矿 |
| 收稿时间： | 2017/4/6 0:00:00 |
| 修稿时间： | 2017/6/2 0:00:00 |
Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization |
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| YUE Su-wei,DENG Xiao-hu,YAO Jun-ming and SUN Ya-li.Re-Os Isotope Dating of Molybdenite from the Shapoling Mo Deposit, East Qinling and Its Implication for Identification of Late Jurassic Mo Mineralization[J].Rock and Mineral Analysis,2017,36(3):305-317. |
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| Authors: | YUE Su-wei DENG Xiao-hu YAO Jun-ming and SUN Ya-li |
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| Institution: | School of Jewlry, Guangzhou College South China University of Technology, Guangzhou 510800, China,Beijing Institute of Geology for Mineral Resources, Beijing 100012, China,Guangzhou Insititute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China and Guangzhou Insititute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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| Abstract: | The Shapoling Mo deposit is located in the Xiong''er rock mass of the southern margin of the North China Craton. The deposit is hosted in a contact zone between granite and wallrocks of the Taihua Soupergroup, which is a recently found discovered vein dissemination type deposit in East Qinling. The ore-bodies are associated with quartz veins and controlled by subsidiary faults. The mineralization styles include veinlet and disseminated types. In order to determine the age of the Shapoling Mo deposit, Re-Os isotopic dating of molybdenite was conducted. Six molybdenite samples yielded Re-Os ages ranging from 158.3±1.5 Ma to 160.7±1.2 Ma, with a weighted mean age of 160±1 Ma (2σ, MSWD=2.1). The Re-Os age shows that the Mo mineralization occurred during the late Jurassic, earlier than the formation of Huashan rock mass (about 30 Ma). In addition, one molybdenite sample in Huashan rock mass yielded a Re-Os age of 130.5±1.0 Ma, which is in accordance with the age of the Huashan pluton and molybdenite age (125.4-129.4 Ma) reported by a previous study. In conclusion, the Shapoling deposit contains two episodes of Mo mineralization from the early Cretaceous and late Jurassic periods. Combining this with geological characteristics and tectonic-metallogenic evolution, it is suggested that Huashan rock mass, granite porphyry, and related hydrothermal deposits in the Xiong''er terrain are the products of extrusion to extension transition during continent-continent collision in the Qinling orogenic belt. |
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| Keywords: | Re-Os isotopic dating Shapoling Mo deposit East Qinling Orogenic belt |
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