湖南清水塘铅锌矿床成矿特征及找矿方向

Metallogenic Characteristics and Prospecting Direction of Qingshuitang Pb-Zn Deposit in Hunan Province

清水塘矿床位于郴州—邵阳基底断裂北东侧,铅锌矿体呈脉状赋存于寒武系、奥陶系NE向、近SN向断裂中,铅锌矿体受断裂、层位共同控制,具有等距性、垂向分带、向南侧伏规律,在标高450~150 m附近有一个硫化物的次生富集带。通过分析矿区及矿床地质特征、矿体空间分布规律、矿床成因及控矿因素,认为该矿床的成矿过程为含矿热液沿基底断裂向上运移至近地表祁阳山字型构造断裂内,自南向北淋滤并渗透寒武系、奥陶系矿源层,形成了富含矿液的热卤水混合,并在NE向、近SN向等张性、张扭性等成矿有利破碎带中沉淀、富集,从而形成了中低温热液充填型铅锌硫化物矿床。在上述分析的基础上,构建了包含地质特征、矿化特征以及综合信息特征的矿区找矿模型,研究认为该区铅锌矿找矿潜力较大,通过进一步开展综合找矿工作有望发现规模大、品位高的Au、Ag、Cu、Cd、Sb等共伴生矿产。

Qingshuitang Pb-Zn deposit in Hunan Province is located at the northeast side of Chenzhou-Shaoyang basement fault,Pb-Zn ore-bodies are occurred with vein shapes in the NE trending and near SN trending faults of Cambrian and Ordovician. The Pb-Zn ore-bodies are controlled by faults and stratigraphic position,and the ore-bodies with the regularities of equidistance disposition,vertical zonality and lateral trending to the south,a secondary sulfide enrichment belt is occurred near the area of evaluation 450 - 150 m. Based on the geological working results newly obtained in the mining area,the geological characteristics of the mining area and deposits,ore-body spatial distribution regularity,deposit genesis and ore-controlling factor of the mining area are discussed in detail,it is show that the metallogenic process of the deposit can be described as following： the ore-bearing hydrothermal is moved upward along the basement faults to Qiyang mountain type tectonic fracture located in the surface,and the mineralization strata of Cambrian and Ordovician is leached and permeated from south to north,the hot brine mixture hydrothermal rich in mineral fluid is formed,and it is precipitated and enriched in the favorable metallogenic fracture belt（ such as NE trending and near SN trending extensional tenso-shear property fracture belts）,so the medium-low hydrothermal filling type Pb-Zn sulfide deposit is formed. Based on the above analysis results,the prospecting model of the mining area related to geological characteristics,mineralization characteristics and comprehensive information characteristics is established,and the further study results indicated that the prospecting potential of Pb-Zn deposit in the mining area is huge,besides that,the coexisting minerals or accompanying minerals such as Au,Ag,Cu,Cd and Sb with the characteristics of large scale and high grade can be found in the mining area by further conducting comprehensive prospecting work.