【作者】 孙刚；

【导师】 杨言辰；

【作者基本信息】 吉林大学 ， 地质工程， 2013， 硕士

【摘要】 达嘎音温都尔锌铜矿床地处于内蒙古中部地槽褶皱系（Ⅱ）、爱力格庙－锡林浩特中间地块（Ⅱ3）的北东部。在预查工作中发现，目前正在进行普查。区域岩浆活动强烈，从古生代至中生代均有岩浆侵入，深成、中深成、浅成侵入岩和脉岩都很发育，岩性以中性、中酸性至酸性岩为主。区域构造主要是北东向复背斜褶皱，核部为中二叠统大石寨组（P2d），两翼被上侏罗统地层不整合覆盖，褶皱核部及两翼发育有北东、北西、东西向断层，沿断层有二叠纪、白垩纪岩体产出；其中北西向断层主要分布在褶皱两翼地层发育区，对地层进行强烈改造的同时，也控制了后期侵入岩、火山岩的分布和产状，其与北东、东西向断裂交汇部位往往出现矿化密集区。研究区包含了1:5万区域地质矿产调查所圈定的AS-17乙1综合异常。预查发现矿化带3处，包括Ⅰ号铜矿化带、Ⅱ号锌矿化带和Ⅲ号锌锡矿化带。Ⅰ号铜矿化带内赋存铜矿（化）体，伴生银，根据钻探圈出工业矿体3层、低品位矿体3层，矿体赋存于强硅化凝灰岩中的黄铁矿化含萤石矽线石蚀变带中，走向南东，倾角47°左右。围岩蚀变以褐铁矿化、铁锰矿化、硅化为主；矿化带地表见碱长花岗岩，深部上下盘均为似斑状中细粒花岗岩，围岩蚀变以硅化为主，轻微钾化。Ⅱ号锌矿化带内见低品位锌矿体，赋存于褐铁矿化凝灰岩中，地表锌矿体宽度厚4.23-4.57m，延长大于100m，倾向北北东，倾角65-70°，Zn品位0.76%。围岩蚀变以褐铁矿化、铁锰矿化为主。Ⅲ号锌锡矿化带内圈出锌工业矿体5层、锌低品位矿体4层、锡工业矿体1层。锌矿（化）体赋存于长英质碎裂岩中的萤石化铁矿化绿泥石化蚀变带中，原岩为花岗闪长岩，锡矿体赋存于闪长玢岩脉中的黄铁矿化绿帘石化蚀变带内，矿体倾向南东东，倾角75°左右，Zn平均品位1.66%； Sn平均品位0.26%。矿体上下盘界线不明显，蚀变较强，围岩蚀变以绿帘石化、轻微硅化为主，裂隙内可见碳酸盐化、褐铁矿化。初步研究建立了达嘎音温都尔锌铜多金属矿地质-地球物理-地球化学找矿模型，主要表现为“花岗岩内构造发育处、花岗岩内凝灰岩残留体——主成矿元素综合异常内——较高极化率——高磁性——低电阻率”。对研究区的找矿远景进行了评价，结果表明Ⅰ号铜矿化带和Ⅲ号锌锡矿化带见矿厚度大，沿走向、倾斜均有继续追索扩大矿体规模的空间；另通过对区域成矿地质条件、研究区地质特征和物化探资料的综合分析，认为研究区成矿地质条件有利，具有较好的找矿潜力，通过工作有望扩大已发现矿体的规模及发现新矿体，探求出一定规模的铜、锌资源量。更多还原

【Abstract】 The Dagayinwendouer Zn-Cu deposit is located in the central Inner Mongolia ofgeosynclinal folded system (Ⅱ), northeastern part of middle mass (Ⅱ3) betweenAiligemiao and Xilinhaote. We discovered that general survey is underway in the area fromour per-survey work. Magmatic activity is intensity in the area, and magmatic intusionpresented from the Paleozoic to Mesozoic. The plutonic, mesogene and hypabyssalintrusive rocks are well distributed, and lithology are mainly intermediate,intermediate-acid and acid rock. Regional structure is mainly NE-trending anticlinorium,and core is the Middle Permian Dashizhai group (P2d) and two limbs of the fold isunconformably overlain by the Upper Jurassic strata. The core and two limbs for the folddeveloped NE-, NW-and EW-trending fault, and the Permian and Cretaceous rock bodies ishosted along the fault. The NW-trending fault is mainly developed in two limbs of the fold,which transformed the strata and controlled distribution and attitude of intrusive rock andvolcanic rock in the late period. The intersection of NW-, NE-and EW-trending faultalways disappear dense area of mineralization. The study area contains AS-17comprehensive anomaly from1：50000regional geology and mineral resources survey.There are3mineralized zone were discovered in the area, including No. ⅠCumineralized zone, No. Ⅱ Zn mineralized zone and No. Ⅲ Zn-Sn mineralized zone. The Cumineralized body is hosted in the No. Ⅰ Cu mineralized zone and accompanied with Ag.According to drilling, we delineated3layers of industrial orebody and low grade orebody.The orebodies are hosted by pyritization fluorite-bearing sillimanite alteration zone fromhigh silicification tuff with SE-trending strike and dip about47°. The wall alteration mainlycontains ferritization, Iron manganese mineralization and silicification. Alkali-feldspar granite presented in the mineralized zone and fine to medium grain mimoporphyritic granitein the deep hanging wall side and footwall. The wall alteration is mainly silicification, withminor potassic alteration. Low grade Zn orebodies presented in the No. Ⅱ Zn mineralizedzone, which is hosted by pyritization tuff with4.23-4.57m in width,100m in length,NNE-trending strike, dip of65-70°and grade of Zn is0.76%. The wall alteration mianlycontains pyritization and Iron manganese mineralization. The No. Ⅲ Zn-Sn mineralizedzone delineated5layers of industrial orebody,4layers of low grade of Zn and1layer of Snindustrial orebody. Zn orebodies are hosted by fluoritization, chloritization alterated zonewithin felsic cataclasite, and protolith is granodiorite. Sn orebodies are hosted bypyritization, epidotization alterated zone within porphyry diorite vein, and dip towards SEE,dip of75°, average grade of Zn and Sn are1.66%and0.26%, respectively. The hangingwall side and footwall for orebody is not obvious. The wall alteration mainly containsepidotization, slight silicification, and carbonatization and ferritization appeared withinfissure.Preliminary research established geology-geophysics-geochemical prospecting modelfor the Dagayinwendouer copper polymetallic deposit, which mainly showed that structuredeveloped position within granite, residual body within tuff-comprehensive anomaly ofmain ore-forming elements-higher polarizability-high magnetism-low electrical resistivity.We have evaluated propecting perspective for the study area, results indicate that hugeof orebody thickness, space for enlarge scale of orebody along stike and dip to the No.ⅠCumineralized zone and No. Ⅱ Sn-Zn mineralized zone. In addition, according to regionalore-forming geological conditions, comprehensive analysis of geological characteristics,and geophysical and geochemical data, we considered that ore-forming geologicalconditions for the study area is beneficial, and possess better prospecting potential, andthere is hopeful prospect that enlarge disconered scale of orebody and new discoveredorebody, and seek certain quantity of Cu, Zn resource.更多还原