内蒙古花脑特银多金属矿床地质特征及成因

Geological Characteristics and Genesis of the Hunaote Ag-polymetallic Deposit,Inner Mongolia

花脑特银多金属矿地处西伯利亚陆块东南缘古生代增生带之吉林宝力格大队晚古生代增生带内,位于大兴安岭中段古生代、中生代Fe、Zn、W、Au、Pb、Cr成矿带。结合矿区地质工作成果,对区域地质背景、矿区及矿床地质特征进行了详细分析,结果表明:1该矿床为大型中—低温热液脉状矿床,受NW向断裂构造带控制,形成于中三叠纪岩浆侵入之后的热液活动期;2该矿床以Ag为主,次为Pb、Zn、Cu,还伴生有Au、S、As、Cd、Ga、In;3矿床主矿体埋深在-500 m以下,矿体埋藏深、共伴生元素较多。在上述分析的基础上,对矿床成因进行了讨论,认为花脑特银多金属矿床为与正长花岗岩有关的热液型矿床。上述分析对于区内进一步开展银多金属矿找矿工作有一定的参考价值。

The Huanaote Ag-polymetallic mining area is located in the late paleozoic hyperplasia belt of Jilinbaolige brigade of the palaeozoic hyperplasia of continental south-east Siberia,and it is also located in the Fe,Zn,W,Au,Pb,Cu metallogenic belt of the paleozoic and mesozoic of the middle section of Daxing'an mountains. Based on the geological working results of the Huanaote Au-polymetallic mining area,the geological characteristics of the mining area and deposits are analyzed in detail,the results show that: 1the Huanaote Ag-polymetallic deposit is large medium-low temperature hydrothermal vein deposit,it is controlled by NW-direction fracture tectonic belt,it is formed in the hydrothermal activity period in the middle Triassic magmatic intrusion period; 2the deposit is given priority to Ag,followed by Pb,Zn and Cu,and associated with Au,S,As,Cd,Ga and In; 3the ore-body depth of the main ore-bodies of the Huanaote Ag-polymetallic deposit is more than-500 m,the buried depth of the ore-bodies is large,besides that,its paragenetic elements and associated elements are rich. Based on the above analysis results,the deposit genesis is discussed,the results show that Huanaote Ag-polymetallic is hydrothermal type deposit related to syenogranite. The above analysis results of the paper can provide some reference for the prospecting work of Ag-polymetallic deposit in the mining area.