新疆和田团结峰铅锌矿床勘查模型初论

新疆和田县团结峰铅锌矿床是西昆仑地区新发现的一处重要MVT型铅锌矿床,铅锌规模达中型,伴生银。在勘查工作实践及综合研究矿床模型基础上,总结了矿床的成矿地质条件、地球物理勘查模型、地球化学勘查模型和地质找矿标志。研究表明:赋矿地层为中侏罗统龙山组二段灰岩,次级NW向断裂控制了铅锌矿体的分布,硅钙面之上的层间构造是矿体的赋存部位。1∶50万水系沉积物测量勘查模型显示:矿区及周边主要异常元素有Au,Ag,Pb,Zn,Mn,Hg,Sb,Cu,Co等,矿区为Ag-Zn-Cu-Pb-Au-As-Sn-Cr-Fe-F异常范围内,元素异常套合较好。1∶5万水系物测量勘查模型显示:成矿元素Ag,Zn,Cu,As,Sn,Sb,Pb浓度分带明显,异常套合好,有明显的浓集区;1∶1万瞬变电磁测量勘查模型显示:矿区内主要岩层的电阻率差异很大,含铅锌矿化地层电阻率为4 660～6 030Ω·m,可形成中高阻异常;遥感蚀变信息勘查模型显示:矿区遥感异常以羟基为主,铁染零星,异常与构造套合较好。除了物化遥异常标志外,铁帽、次级NW向断裂、围岩蚀变也是重要的找矿标志。

A Preliminary Review of Exploration Model of Tuanjiefeng Lead-Zinc Deposit in Hotan County,Xinjiang

Tuanjiefeng lead-zinc deposit in Hotan county which associated with silver,has reached middle scale,is an important Mississippi Valley-type lead-zinc deposit in West Kunlun. The article summarizes metallogenic geological conditions, geophysical exploration model,geochemical exploration model and geological prospecting criteria of the deposit on the basis of exploration practice and comprehensive study of the deposit model.The researches show that the 2nd limestone of middle Jurassic,longshan formation is the ore-bearing strata. The interlayer structure above the silicon - calcium surface is where the ore body occurs and the secondary North-West fault controlled the distribution of lead-zinc ore bodies. The 1:500,000 sediment survey and exploration model shows that the main abnormal elements in and around the mining area are Au,Ag,Pb, Zn,Mn,Hg,Sb,Cu,Co and etc.The Element exceptions fit well and the mining area is within the abnormal range of Ag-Zn-Cu-Pb-Au-As-Sn-Cr-Fe-F.The 1:50000 drainage survey and exploration model shows that the concentration of metallogenic elements Ag,Zn,Cu,As,Sn,Sb and Pb were obviously distributed, and the abnormal combination was well done with obvious concentration area.The 1:10000 transient electromagnetic survey exploration model shows that there is great variability in resistivity of the main rocks in the mine. The formation resistivity of which contains lead-zinc mineralization is 4 660~6 030 Ω·m,can form high resistance resistivity anomaly. Remote sensing alteration information exploration model shows that the main remote sensing anomaly in mining area is hydroxyl.Scattered iron stains and the anomaly is in the same direction as the structure. In addition to geophysics, geochemistry, remote sensing anomaly markers, iron cap, secondary northwesterly fault and alterations of wall rocks are also important prospecting indicators.