【作者】 李向文；

【导师】 杨言辰；

【作者基本信息】 吉林大学 ， 矿产资源经济与技术， 2010， 硕士

【摘要】 宝兴沟金矿地处天山-兴蒙造山带、大兴安岭火山岩带东北部上黑龙江拗陷腰站断陷南缘与十八站隆起北缘交接部位。矿体产出于闪长玢岩、辉绿玢岩、花岗细晶岩与二十二站组砂岩接触带中,目前已发现矿化蚀变带4条,破碎蚀变岩型金矿体13条,储量规模达到中型。本区成矿地质条件优越,找矿标志明显,具备较好的找矿潜力。本文从成矿地质背景分析入手,深入研究矿床地质特征、地球化学特征,分析成矿地质条件,厘定成矿岩体的形成时代,探讨矿床成因,建立成矿模式；根据成矿地质条件与地质、地球物理、地球化学等找矿信息研究,确定找矿方向,优选后续勘查工作靶区,预测找矿潜力。研究成果对指导该矿床乃至该地区类似矿产的勘查工作具有重要理论与实际意义。更多还原

【Abstract】 The Baoxinggou gold deposit is located in the Tahe transition zone in southeastern border of Eerguna massif, in geosyncline folded belt from Daxinanling to Inner Mongolia, in the intersection of southern fringe of Yaozhan fault depression and noah margin of Shibazhan uplift. Mineralization condition in this region is advantageous, Ore-prospecting criteria, and it also has a good prospecting prospect.The mainly stratas of this mining area are only Jurassic twenty-two station formation, emuer river formation and quaternary; Magmatic rock strains in shape, which contains granitic porphyry, dioritic porphyrite, diabase porphyrite and granitic aplite. The Vein rocks are mainly diorite porphyrite, diabase porphyrite and granitic aplite. Fracture structures mainly exist in this area, which consists of the north-west yixiken to twenty-two station fracture, suian station to fifteen Bridge fracture, and the north east, North west Subprime fracture. Ring structures are also developmented in this area, which are in the north west that of directional distributed, and they are likely to be relevant to the shallow or super shallow intrusions. Hidden rocks may exist beside of some exposed rocks.The ore body is closely relevant to the shallow intrusions, such as diorite porphyrite, diabase porphyrite, etc, which are veins in the contact area of diorite porphyrite, diabase porphyrite,and twenty-two station sandstone. The Ore-hosting rocks are altered sandstone and altered diorite porphyrite.Four mineralized altered zones and 13 broken altered mine bodies are found in this study area, with a control length of 240 to 1147m, an average thickness of 0.50 to 10.45m, and a tenor of 1.12 to 2.79×10-6.Pyrite are the main metal minerals, others such as chalcopyrite, copper, sphalerite and galena may also exist.。The altered degree of ore-forming relevant wallrock is characterized as the mid-low temperature alteration, which consists of silica, carbonatization, sericitization and chloritization, etc.Gold ore is mainly controlled by the north east linear structures, which also control the Au anomalism that displays a north eastern distribution.There are strong superposition characters in later period, where is the key for searching the Au, Ag, Pb, Sb deposits.The rare-earth element models of the mining rock and minerals show the enrichment of light elements, which have the characters of Eu negative to weak positive abnormal. Ore-forming related diorite porphyrite and diabase porphyrite show a high k calcium alkaline basalt. By the means of zircon U-Pb dating, a 124.92±1.3Ma age can be estimated for the intrusion age. Considering the relationship between the rock and the gold deposit, we conclude that the metallogenic epoch should be slightly later than 124.92±1.3 Ma, which belongs to early cretaceous.The main metallogenic materials come from the Jurassic twenty-two statio sandstone, early cretaceous diorite porphyrite and diabase porphyrite.The heat source comes from magma activities, and the uniform temperature of ore-forming fluid shows from 266.9 to 319.6oC, with a peak of 280-290oC. The metallogenic depth is 0.8-120 kilometers,Therefore this deposit is considered to be the epithermal deposits.According to the geological characteristics of the main orebodies thar are discovered, soil anomalies and electrical anomalies of the outer area of main orebody are evaluated, to decide 2 research areas for further exploration, which are predicted to have a potential amount of about 4000 kg, and to put forward some Suggestions for indicating the direction for follow-up exploration work.Based on the existing research results, Baoxinggou gold deposit and its periphery shows a good prospect of becoming a big gold deposit.更多还原