2018: 鄂东矿集区宝团山金铜矿床地质特征、赋矿岩体锆石U-Pb年龄和Hf同位素组成及其地质意义. 地质通报, 37(7): 1346-1359. DOI: 10.12097/j.issn.1671-2552.2018.07.018
    引用本文: 2018: 鄂东矿集区宝团山金铜矿床地质特征、赋矿岩体锆石U-Pb年龄和Hf同位素组成及其地质意义. 地质通报, 37(7): 1346-1359. DOI: 10.12097/j.issn.1671-2552.2018.07.018
    2018: Geological characteristics, U-Pb age and Hf isotope of zircon in hosting intrusion for Baotuanshan Au-Cu deposit, Edong ore cluster and its geological significance. Geological Bulletin of China, 37(7): 1346-1359. DOI: 10.12097/j.issn.1671-2552.2018.07.018
    Citation: 2018: Geological characteristics, U-Pb age and Hf isotope of zircon in hosting intrusion for Baotuanshan Au-Cu deposit, Edong ore cluster and its geological significance. Geological Bulletin of China, 37(7): 1346-1359. DOI: 10.12097/j.issn.1671-2552.2018.07.018

    鄂东矿集区宝团山金铜矿床地质特征、赋矿岩体锆石U-Pb年龄和Hf同位素组成及其地质意义

    Geological characteristics, U-Pb age and Hf isotope of zircon in hosting intrusion for Baotuanshan Au-Cu deposit, Edong ore cluster and its geological significance

    • 摘要: 宝团山矿床位于鄂州市沙窝乡宝团村,是鄂东矿集区北缘鄂城岩体内部新发现的金铜矿床。矿体主要赋存于石英二长岩中,受断裂构造控制。对典型矿石样品开展了矿物学特征的研究,同时对与成矿关系密切的石英二长岩进行了锆石U-Pb和Hf同位素分析。结果显示,矿石中金以赋存于黄铜矿中的可见金和黄铁矿中的不可见金为主,原生含铜矿物主要为黄铜矿。石英二长岩LA-ICP-MS锆石U-Pb年龄为136±1Ma,εHft)值介于-21.9~-7.2之间,暗示石英二长岩岩浆源区为壳幔物质混合的产物。通过对比研究认为,宝团山矿床可能代表了鄂东矿集区内存在一期受构造控制的金铜矿化事件。该矿床位于程潮矽卡岩型铁矿的外围,与长江中下游成矿带已报道的铁矿床外围存在金铜矿床/矿化现象一致。因此在区域金矿勘查中,建议注意寻找岩体中受断裂控制的热液型金矿床,同时铁矿床及其外围金矿床之间的联系值得深入思考。

       

      Abstract: Recently discovered Baotuanshan Au-Cu deposit is located in the Baotuan Village, Shawo County, Ezhou, Hubei Province. Ore bodies occur as veins in quartz monzonite along fracture structures. This study carried on mineralogy, age and Hf isotope of the ore-hosting quartz monzonite. Au occur as visible gold inclusions in chalcopyrite and invisible gold in pyrite, and chalcopyrite is domain the primary Cu-bearing mineral. LA-ICP-MS U-Pb dating of zircon from the quartz monzonite yielded an age of 136±1Ma (MSWD=2.1, n=31) and εHf(t) values are between -21.9~-7.2, suggesting that quartz monzonite was derived from the mixture of crust and mantle. Baotuanshan Au-Cu deposit may represent a period of Au-Cu mineralization. Additionally, this deposit lay on the periphery of Chengchao skarn Fe deposit, and is similar to these Au-Cu deposits/occurrences located on the peripheral of Fe deposits in the Middle-Lower Yangtze River metallogenic belt reported before. Therefore, more attention should be paid on this type of Au deposits during gold explorations, and the linkage between Fe deposits and gold deposits needs further consideration.

       

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