武斌;董美川;李明波;张海瑞;刘继勇;

• 1:山东省第四地质矿产勘查院
• 2:山东省地矿局海岸带地质环境保护重点实验室
• 3:中国地质大学(武汉)

摘要(Abstract)：

贺家沟地区位于山东省西部沂南县南约20 km，地处郯庐断裂带西侧的沂山凸起东南缘，区域上已经发现了沂南金场和铜井两处金及多金属矿床。贺家沟地区处于沂南金场、铜井矿区外围地区，成矿条件非常相似，近几年在该地区的地球物理、地球化学勘查找矿工作也指示其具有较好成矿潜力，并在该地区发现多处金多金属矿点。本次研究尝试运用贺家沟地区二长闪长玢岩锆石微区成分来解释成矿岩体的构造环境、岩浆演化特征以及区内成矿作用。LA-ICP-MS锆石U-Pb年代学显示贺家沟二长闪长玢岩加权平均年龄为(128±0.43) Ma，为早白垩世。锆石结晶温度为662～734℃，锆石中Th/U比值为0.71～1.40，表示锆石均为岩浆型锆石；锆石Sc/Yb为0.40～0.92,U/Yb为0.48～1.48,Th/Yb为0.43～1.75，指示其岩浆具有大陆弧型和大陆花岗质岩浆特征。锆石w(Pb)为3.62×10^(-6)～20.06×10(-6)～20.06×10^(-6),w(Th)为116.6×10(-6),w(Th)为116.6×10^(-6)～1023.0×10(-6)～1023.0×10^(-6)，显示I型花岗岩特征，即为壳幔混合成因；锆石Eu/Eu(-6)，显示I型花岗岩特征，即为壳幔混合成因；锆石Eu/Eu^*为0.434～0.681,Ce/Ce*为0.434～0.681,Ce/Ce^*为16.450～408.509，表明其具有很好的斑岩型铜金矿成矿潜力。

关键词(KeyWords)： 二长闪长玢岩;锆石;U-Pb地质年代学;微量元素;鲁西贺家沟地区

Abstract:

Keywords:

基金项目(Foundation): 山东省地勘基金项目（编号：鲁勘字[2016]43号；鲁勘字[2018]36号；鲁勘字[2020]16号）;; 山东省地质矿产勘查开发局科技创新项目（编号：鲁地字[2021]6号）联合资助

作者(Authors): 武斌;董美川;李明波;张海瑞;刘继勇;

DOI: 10.16461/j.cnki.1000-4734.2022.42.070

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