胶东中生代花岗岩与金矿关系研究及成矿期划分
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1.山东省地质调查院;2.山东省地质科学研究院

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山东地勘基金项目(编号鲁勘字(2018)19号,鲁勘字(2021)18号,鲁勘字(2014)7号)、山东自然科学基金项目(编号ZR2020MD033)


The relationship between Mesozoic granite and gold deposit and division of metallogenic period in eastern Shandong
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Shandong Institute of Geological Survey

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    摘要:

    胶东金矿集区是世界著名的黄金资源基地,截止2020年底,累计查明金矿资源量已达5400余吨。胶东地区中生代花岗岩分布广泛,岩石类型多,并与金矿关系密切。本文按时代+岩浆事件+岩性的划分方法,将胶东区域性广泛分布的中生代花岗岩划分为晚侏罗世玲珑期、早白垩世早期郭家岭期、早白垩世晚期伟德山期和崂山期,对上述四期花岗岩与金矿的空间展布、成矿物质来源、形成时代等关系进行了研究。金矿石硫同位素与玲珑期花岗岩、郭家岭期花岗岩范围相近,特别是与玲珑期花岗岩范围重叠,金矿石铅主要为再活化的下地壳铅,即前寒武纪结晶基底铅,有幔源铅加入,金矿石Sr-Nd同位素数据大部分与前寒武纪变质基底、玲珑期花岗岩、郭家岭期花岗岩及中生代脉岩重叠,暗示Sr、Nd主要来自地壳源区。胶东金矿床Au元素可能来源于胶东岩群、新太古代TTG岩、玲珑期花岗岩和郭家岭期花岗岩,主要来源于下地壳(初始为华北板块和扬子板块前寒武纪结晶基底),有壳幔相互作用地幔物质加入。空间上,88%的金矿资源量赋存在玲珑期花岗岩中,7%的金矿资源量赋存于郭家岭期花岗岩中,伟德山期和崂山期花岗岩中金矿资源量仅占0.1%。时间上,晚侏罗世玲珑期、早白垩世早期郭家岭期、早白垩世晚期伟德山期和崂山期花岗岩形成时间分别为166~146 Ma、135~123 Ma、123~110 Ma、118~108 Ma,金矿年龄值有162~146 Ma、133~120 Ma、120~105 Ma、110~105 Ma四个区间范围,二者具有较好的对应关系,成矿事件一般同步或略滞后于同源岩浆活动,即162~146 Ma成矿期对应玲珑期重熔花岗岩的侵位事件,133~120 Ma成矿期对应郭家岭期花岗岩的侵位事件,120~105 Ma的成矿期对应伟德山期和110~105 Ma矿化期对应崂山期花岗岩侵位事件,据此将胶东金矿成矿期划分为玲珑金成矿期、郭家岭金成矿期、伟德山金及多金属成矿期和崂山钼矿化蚀变期。

    Abstract:

    Jiaodong Gold Mine Cluster is a world-famous gold resource base. By the end of 2020, the total amount of gold resources identified has reached 5400 tons. The Mesozoic granites in Jiaodong area are widely distributed with many rock types and closely related to gold deposits. According to the division method of age+magmatic event+lithology, the Mesozoic granites widely distributed in Jiaodong region are divided into Late Jurassic Linglong stage, Early Early Cretaceous Guojialing stage, Late Early Cretaceous Weideshan stage and Laoshan stage. The relationship between the above four stages of granites and gold deposits, including spatial distribution, source of ore-forming materials, and age of formation are studied. The sulfur isotope of gold ore is similar to the Linglong granite and Guojialing granite, especially overlapping with the Linglong granite. The lead of gold ore is mainly the reactivated lower crust lead, that is, the Precambrian crystalline basement lead, with the addition of mantle-derived lead. The data of Sr-Nd allotrope of gold ore mostly overlaps with the Precambrian metamorphic basement, Linglong granite, Guojialing granite and Mesozoic vein rock, suggesting that Sr Nd mainly comes from the crustal source area. The Au elements of the Jiaodong gold deposit may come from the Jiaodong magmatic rock group, the Neo-Archean TTG rocks, the Linglong granite and the Guojialing granite, mainly from the lower crust (initially the Precambrian crystalline basement of the North China plate and the Yangtze plate), with the addition of crust-mantle interaction mantle materials. In space, 88% of the gold resources are hosted in Linglong granite, 7% in Guojialing granite, and only 0.1% in Weideshan and Laoshan granite. In terms of time, the formation time of granite in Linglong stage of Late Jurassic, Guojialing stage of Early Cretaceous, Weideshan stage and Laoshan stage of Late Cretaceous are 166~146 Ma, 135~123 Ma, 123~110 Ma, 118~108 Ma respectively, and the age value of gold deposit is 162~146 Ma, 133~120 Ma, 120~105 Ma, 110~105 Ma, which have good corresponding relationship. The mineralization events are generally synchronous or slightly lagged behind the homologous magmatic activities, That is, the 162~146 Ma mineralization period corresponds to the emplacement event of Linglong period remelted granite, the 133~120 Ma mineralization period corresponds to the emplacement event of Guojialing period granite, the 120~105 Ma mineralization period corresponds to the Weideshan period and the 110~105 Ma mineralization period corresponds to the Laoshan period granite emplacement event. Therefore, the Jiaodong gold mineralization period can be divided into Linglong gold mineralization period, Guojialing gold mineralization period, Weideshan gold and polymetallic mineralization period and Laoshan molybdenum mineralization alteration period.

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  • 收稿日期:2021-09-07
  • 最后修改日期:2021-10-29
  • 录用日期:2021-11-02
  • 在线发布日期: 2023-03-08
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