投稿时间：2023-10-27
修订日期：2024-08-20
网络发布日期：2024-11-05
中文摘要:阿克沙依勘查区是甜水海地体中唯一集铁、铜和铅锌银矿化为一体的多金属勘查区，对其开展研究意义显著。该区的金属矿化分铁、铁铜、铁铅锌、铜铅锌和铅锌银5种，多以脉状形式赋存在古元古界康西瓦群、二叠系黄羊岭群、三叠系巴颜喀拉山群及晚三叠世黑云母二长花岗岩中，且呈现出中心为磁铁矿化，往外为脉状铜铅锌矿化，边部为脉状铅锌银矿化的金属元素分带。这些特征都显示，阿克沙依勘查区的铁多金属矿化归属于岩浆-热液型矿床范畴。对阿克沙依勘查区成矿期的金云母进行40Ar/39Ar同位素测年，获得的坪年龄为（130.67±3.52）Ma。综合前人研究成果，笔者提出甜水海地体发育3套独特的金属成矿系列：① 晚三叠世与伟晶岩有关的稀有金属成矿系列；② 早白垩世与岩浆-热液活动有关的铁多金属成矿系列；③ 渐新世—中新世与盆地卤水有关的密西西比河谷型铅锌矿系列。在未来的甜水海地体矿床勘查工作中，应给予与早白垩世岩浆-热液活动有关的铁多金属矿成矿事件以高度的关注与重视。
中文关键词:40Ar/39Ar年代学 岩浆-热液型矿床 甜水海地体 阿克沙依 西昆仑
Abstract:The Akeshayi prospect district is the only polymetallic mineralization area which integrates Fe, Cu and Pb-Zn-Ag in the Tianshuihai terrane, SW Xinjiang. Mineralization in the district includes five types of Fe, Fe-Cu, Fe-Pb-Zn, Cu-Pb-Zn and Pb-Zn-Ag. They are mainly hosted in the Paleoproterozoic Kangxiwa group, the Permian Huangyangling group, the Triassic Bayankalashan group and the Late Triassic biotite monzonite granite in the form of hydrothermal veins. Moreover, there is an apparent metal zoning in the district with Fe in the center, hydrothermal-vein Cu-Pb-Zn in the periphery and hydrothermal-vein Pb-Zn-Ag in the outermost side. The above geological characteristics indicate that the Akeshayi prospect district is a Fe-polymetallic mineralization district associated with magmatic-hydrothermal activity. Phlogopite 40Ar/39Ar dating yields a plateau age of (130.67±3.52) Ma at Akeshayi. Based on previous research results, we propose that there are three metallogenic series in the Tianshuihai terrane: ① Rare-metal metallogenic series related to the Late Triassic pegmatites; ② Fe-polymetallic metallogenic series related to the Early Cretaceous magmatic-hydrothermal activity; ③ Oligocene-Miocene Mississippi valley-type Pb-Zn metallogenic series related to basin brines. Later prospecting in the Tianshuihai terrane should pay more attention to the Early Cretaceous Fe-polymetallic metallogenic series that relates to magmatic-hydrothermal activities.
keywords:40Ar/39Ar geochronology magnetic-hydrothermal deposit Tianshuihai terrane Akeshayi western Kunlun
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基金项目:本文得到中国地质调查局地质调查项目（编号:DD20221684）和中央级科研院所基本科研业务费项目（编号:KK2203）联合资助
引用文本：
张永乐,宋以龙,欧阳荷根,孙强,杨燕.2024.甜水海地体阿克沙依铁多金属勘查区白垩纪成矿的年代学证据及其找矿意义[J].矿床地质,43(5):1041~1053ZHANG YongLe,SONG YiLong,OUYANG HeGen,SUN Qiang,YANG Yan.2024.Geochronology evidence of Cretaceous mineralization in Akeshayi Fe-polymetallic prospect district and its significance for prospecting[J].Mineral Deposits43(5):1041~1053
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