新疆青河县顿巴斯套金矿床地质-化探找矿模型

Geological- geochemical prospecting model of Dunbasitao Gold Deposit in Qinghe County,Xinjiang

新疆青河县顿巴斯套金矿床位于准噶尔成矿区,矿区主要地层为下石炭统姜巴斯套组,地表中性脉岩出露普遍,发育有褐铁矿化、硅化及绢云母化等围岩蚀变,矿区南西有酸性岩体出露。研究区的脉岩、矿脉及矿体大都赋存在NWW向的断裂构造中,目前以L8号矿体为代表的主矿带工程控制程度最高。在系统研究顿巴斯套金矿区地质特征和矿床地质特征的基础上,以主矿带为例,开展了地表地质路线调查、土壤、岩屑地球化学测量及钻孔原生晕数据分析、探槽及钻孔等山地工程所揭露的品位、厚度等矿化信息提取等研究。地球化学测量显示,对成矿具有较强指示性的元素组合为Au-As-Ag-Sb-Hg。原生晕的垂向分带序列及与原生晕有关的w(As)/w(Mo)及w(As+Sb)/w(Co+Mo)等地球化学参数指示矿体向深部有一定延伸。通过综合研究建立研究区地质-化探综合找矿模型,为今后的找矿提供指导。

Dunbasitao Gold Deposit in Qinghe County,Xinjiang,is located in Junggar metallogenic belt. The major strata in the district are Lower Carboniferous Jiangbasitao Formation. Outcrops of intermediate vein rocks are common,alteration like ferritization,siliconization and sericitization develops in here and outcrops of acidic rocks are found in the southwestern part of the district. The vein rocks,veins and orebodies are mostly hosted in the NWW trending faults. For now,the L8,standing for the major ore belt,has the highest engineering controlling degree. Based on systematic study of regional geological characteristics and deposit geological feature of Dunbasitao gold district,studies are carried out,including investigation on surface geological routes,soil geochemical measurement,analysis of primary haloes data,and retrieval of mineralization information like grade and thickness revealed by trenches and boreholes and so on. Geochemical survey demonstrated that the combinations of Au- As- Ag- Sb- Hg are eligible indicators for mineralization. The vertical zoning sequence of the primary haloes and the geochemical parameters of w（ As） / w（ Mo）and w（ As ＋ Sb） / w（ Co ＋ Mo） related to the primary haloes indicate that there is certain stretch of orebodies to the deep. The establishment of the comprehensive geological- geochemical prospecting model of the Dunbasitao Gold Deposit offers guidance for future prospecting.