摘要
黑岚沟金矿区位于胶北地区东部,目前探明金储量占蓬莱地区的70%以上。矿区内与成矿相关的侵入岩富硅、富碱、贫镁,TFeO(1.22%~12.36%,平均值3.38%)、Rb质量分数小于270×10^(-6),稀土元素球粒陨石标准化配分曲线具明显的右倾分配模式,具有弱的正Eu异常,w(Rb)/w(Nb)值为7.8~36.0,为A型花岗岩,具有低镁埃达克岩的特征。LA-ICP-MS锆石U-Pb法测得侵入岩结晶年龄分别为(172.8±0.3)Ma、(172.8±0.4)Ma和(174.0±0.4)Ma,均属中侏罗世早期岩浆活动产物。黑岚沟金矿区主要受下地壳和岩石圈地幔控制,成矿物质来源与地壳的部分熔融、岩石圈地幔和软流圈地幔上涌相关,属于壳幔混合来源。
Heilangou gold deposit is located in the east of Jiaobei area,and the proven gold reserves currently account for more than 70%of that of Penglai area.The intrusive rocks related to mineralization in this area are rich in silicon,and alkali while lacking magnesium,with TFeO(1.22%-12.36%,with an average of 3.38%),and the Rb mass fraction is less than 270×10^(-6).The REE chondrite-normalized distribution curve has an obvious right-leaning distribution model and weak positive Eu anomaly,and the w(Rb)/w(Nb)value is 7.8-36.0,which is A-type gra-nite,with the characteristic of low-Mg adakites.The crystal ages of intrusive rocks measured by the LA-ICP-MS zircon U-Pb method are respectively(172.8±0.3)Ma,(172.8±0.4)Ma,and(174.0±0.4)Ma,which are all related to magmatic activity in the early Middle Jurassic.Heilangou gold area is mainly controlled by the lower crust and lithosp-heric mantle,and the source of ore-forming material is related to the partial melting of the crust and upwelling of lithospheric mantle and asthenosphere mantle,which belongs to the mixed material source of crust and mantle.
作者
刘强
李大鹏
张岩
尉鹏飞
蔡娜
张超
谢伟
Liu Qiang;Li Dapeng;Zhang Yan;Wei Pengfei;Cai Na;Zhang Chao;Xie Wei(Shandong Institute of Geological Sciences;MNR Key Laboratory of Gold Mineralization Processes and Resource Utilization;Shandong Provincial Key Laboratory of Metallogenic Geological Process and Resource Utilization)
出处
《黄金》
CAS
2023年第9期93-102,共10页
Gold
基金
国家自然科学基金项目(42172094)
山东省自然科学基金项目(ZR2020MD032,ZR2020QD028)
山东省重点研发计划项目(2022CXPT047)
山东省地勘基金项目(鲁勘字[2021]7号,鲁勘字[2022]9号)。
