【作者】 解波；

【导师】 钟康惠； 孙泽轩；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2009， 硕士

【摘要】 本论文以中国核工业地质局基础地质项目“康滇地轴铀矿资源潜力评价”和“康滇地轴南段江川306铀矿点深部钻探查证”为依托。在总结和深入分析前人资料的基础上,以具有代表性的江川306铀矿点为重点研究对象,详细研究了该点的铀矿化特征、控矿因素、成矿条件等,建立起江川地区的铀矿成矿模式。采用“点上研究寻求规律,面上调查寻找与点上相似的成矿地质环境”的技术路线,提出可供进一步开展工作的找矿前景区。论文研究取得了以下主要成果及认识:1.通过调查研究江川-建水地区澄江组砂岩的岩石地层结构与沉积相特征,将澄江组划分为3段,第一段以冲积扇相沉积为特征;第二段以三角洲-湖泊相沉积为特征;第三段以辫状河-曲流河相沉积为特征。2.江川306铀矿点铀矿化赋存于断裂构造带内以及断裂构造带旁侧澄江组第二段杂色砂岩构造裂隙中,铀矿化地段发育了硅化、绿泥石-水云母化、金属硫化物化、绢云母化、赤铁矿化等中-低温热液蚀变;铀成矿的控制因素主要为断裂构造,其次为中新元古界不整合面;成矿流体可能来源于基底岩石并切穿中新元古界不整合面的贯通性断裂带。3.经江川306铀矿点深部钻探查证证实,306断裂为多期活动性断裂,早期为张性断裂,晚期为逆冲断裂。断裂带内存在热液活动中心,并非沿整个断裂带都存在热液活动。热液上升的通道位于采场附近断裂带转弯膨胀部位,从而形成“蘑菇”状构造蚀变带。铀矿化赋存于构造带内蚀变砂岩、砂砾岩、砾岩、泥岩中。4.通过面上路线地质调查及地面伽玛能谱测量,在通海地区发现2条与306铀矿点相似的地质、构造蚀变带,构造蚀变带内有铀当量异常显示。5.通过对江川306铀矿点特征与控矿因素的研究,探讨了该区的铀成矿模式,并对江川-建水地区铀矿资源潜力进行了评价。提出下一步找矿的重点部位应放在切穿中新元古界不整合面的断裂构造蚀变带上,具体是“一点一地区”,即江川县306铀矿点与通海地区。上述成果和认识突破了该区受“层位”和“不整合面”控制的传统观点,对江慈?水地区今后的找矿和预测工作具有十分重要的指导意义。更多还原

【Abstract】 The dissertation is supported by China National Nuclear Corporation project, studying“The uranium resources potential evaluation of Kangdian Axis”and“The depth portion drilling verification of 306 uranium in Jiangchuan of in South Section of Kangdian Axis”as a backing.In summarizes and analyzes the predecessor material thoroughly in the foundation, take has representative in Jiangchuan 306 uranium mine as the key object of study, which dissect uranium mineralization characteristic, ore-controlling factors, mineralization condition etc.,and establishes ore-forming model of the uranium mine in Jiangchuan area.Using“seek the rule to research the point, and seek with the point the similar mineralization geological environment on the surface investigates”the technical route, and proposed that before may supply to further do the work the prospecting. The author acquired some outcomes and recognitions:1. Studying detailedly the rock stratal texture and sedimentary facies characteristics of the Jiangchuan to Jianshui area, the author dividesd in 3 sections of Chengjiang group sandstone’s, such as the first section take alluvial fan facies as the characteristic; the second section take delta-lacustrine facies as the characteristic; the third section take braided-meandering river facies as the characteristic.2. The uranium mine mineralization of Jiangchuan 306 hosted in the faulted structure belt as well as in the faulted structure belt side the second section of Chengjiang group mottled sandstone structure crevasse, which grow the low temperature hydrothermal alteration, such as silicalite, chloritization-hydromicatizatio-n, metal-sulfide, sericite, hematite etc. The main controlling factors of uranium mineralization is fault , next for Meso- to Neoproterozoic unconformity; the mineralization fluid possibly originates from under the basis rock and through fault incised the Meso- to Neoproterozoic unconformity.3. Confirmed after the uranium mine depth portion drilling verification of Jiangchuan 306, that 306 fault for many issue of activity faults, the eraly is extension fault, the later is reverse fault. In the fault zone has the hydrothermal activity center, by no means along the entire fault zone. Hydrothermal rise channel located at stope nearby fault zone curve inflation spot, thus forms the shape“mushroom”structure alteration belt. Uranium ore-body mainly hosted in cataclastic rock in fault and in motley sandstone, cataclastic sandstone, mudstone.4. Through the geological investigation of route on the surface and ground Gamma-Ray spectrometry, discovered that 2 with 306 uranium mine similar geology environment, and tectonic-alteration belt in the Tonghai, which have the uranium equivalent exceptionally to demonstrate;5. This paper summaries the characteristic of 306 uranium mine and Ore-controlling factors in Jiangchuan, and discussed its mineralization model. then has carried on the appraisal to the Jiangchuan to Jianshui area uranium mine resources potential. The authors considered, prospecting direction should be alteration belts of through fault incised the Meso- to Neoproterozoic unconformity next, concrete is:“One Point, One Area”, namely 306 uranium mines of Jiangchuan County and Tonghai area.These achievements and views the author obtained brokethrough inland traditional theory on“The Stratum”and“The Unconformity”, they possess extremely important directing significance for ore exploration and prediction in Jiangchuan to Jianshui area.更多还原