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内蒙古神山铁铜矿床是大兴安岭中段唯一被发现的矽卡岩型铁铜矿床。本次就该矿床成矿岩体的地球化学及锆石LA-ICP-MS U-Pb年代学开展相关研究。研究表明:矿区中与成矿有关的伊力特岩体岩石类型为英云闪长岩,属I型花岗岩类,铝过饱和,高钾钙碱性系列和磁铁矿系列;岩石富集轻稀土(LREE)、大离子亲石元素(LILE),亏损高场强元素(HFSE),铕异常不明显(δEu为0.97~1.17),存在弱铈异常(δCe为0.86~0.92);锆石LA-ICP-MS U-Pb测年显示,与成矿有关的伊力特岩体形成于晚侏罗世((155.3±1.3)Ma),因此推测神山铁铜矿床成矿时代为晚侏罗世。综合研究认为神山铁铜矿床形成于地壳加厚和构造活化的构造环境。
The Inner Mongolia Godshan iron-copper deposit is the only skarn type iron-copper deposit discovered in the middle section of the Greater Hinggan Mountains. This time, the geochemistry and zircon LA-ICP-MS U-Pb geochronology of the metallogenic rock mass in this deposit are studied. The results show that the type of rock that is related to metallogenetic mineralization in the mining area is diagenetic diorite, belonging to type I granite, aluminum supersaturated, high-K calc-alkaline series and magnetite series. The rock is enriched in light rare earth ( LREE, LILE and HFSE, the Eu anomaly is not obvious (δEu is 0.97 ~ 1.17), and weak cerium anomaly (δCe is 0.86 ~ 0.92). The zircon LA-ICP The -MS U-Pb dating shows that the Yilittite-related rock mass formed during the Late Jurassic ((155.3 ± 1.3) Ma), suggesting that the mineralization age of the Kushan Iron-Copper Deposit was Late Jurassic. Comprehensive studies suggest that the Kushan iron-copper deposit formed in the crust thickening and tectonic activation tectonic environment.