广子田矿床铀矿化与矿物学特征及成矿机制探讨

发布时间：2018-06-22 10:51

本文选题：广子田铀矿床 + 矿物学特征　；参考：《东华理工大学》2017年硕士论文

【摘要】：广子田铀矿床是在1972年被广西三一0核地质大队于发现的,1972-1992年在全长4.5km的范围内共投入钻探工作量125198.60m、坑探工作量2362.97m,1994年12月提交了《广西全州县广子田铀矿床详查报告》,矿床规模为中型,矿床类型为碳酸盐岩型。2006年10月—2011年11月,广西三一0核地质大队又完成钻探工作量18170.98m,将广子田铀矿床规模扩大为大型。矿床矿体的产状与空间形态严格受构造带控制,主要赋存在F1层间破碎带及其上下盘次级带中;主要矿体呈层状,小矿体大部分呈透镜状。矿体的最高控制标高400m,最低控制标高-640m,矿化垂幅达1000 m。资源量核实范围内地质工作程度达到了详查程度以上,矿床属大型规模、中等品位的碳酸岩型复成因铀矿床。经可行性研究发现矿区开发内外部条件良好,矿床开发利用在技术、经济上可行,开发经济效益良好。广子田矿床位于全州县城334°方向25Km处广子塘村及其附近,隶属全州县大西江镇、龙水镇管辖。通过现代技术测试实验对广子田矿床矿石进行分析研究,从而查明矿石的工艺矿物学特征及铀的存在形式并探讨矿床成矿机制,得出主要结论如下:(1)矿区处于越城岭断褶带东缘,矿区西部大面积出露为加里东期花岗岩和燕山期花岗岩。矿床位于越城岭东面大西江—龙水向斜盆地西翼。Fl断裂带是整装勘查区内的主要含矿构造。(2)矿石类型及矿物组分按含矿岩性的特征将矿石分为三种自然类型,分别是破碎白云岩型、构造泥型和破碎泥质粉砂岩型。(1)破碎白云岩矿石:因赤铁矿、炭质含量的差别,呈现不同的颜色,主要有灰白色、灰黑色、砖红色等。矿石中网脉状裂隙发育,擦痕、石墨化镜面多见,铀主要以沥青铀矿存在,呈细脉状,与铀矿物共生的金属矿物有黄铁矿、赤铁矿、褐铁矿等。(2)构造泥矿石:矿石呈青灰色、灰绿色、猪肝色及其他杂色。铀在构造泥矿石中主要以分散吸附状态存在。(3)破碎泥质粉砂岩矿石:产于F1主带下部,矿石呈青灰色-灰绿色,具碎斑结构。铀主要以沥青铀矿、铀黑存在,与铀矿物共生的金属矿物有黄铁矿、赤铁矿、褐铁矿等。(3)广子田碳硅泥岩型铀矿床大部分为多源、多期、多成因的铀矿床,且以热液(热水)改造成因为主,叠加沉淀富集而成矿。(4)根据研究总结,广子田矿床形成主要经历:(1)沉积成岩时铀预富集;(2)后期地质作用形成运移通道和储铀空间;(3)热液叠加改造成矿。
[Abstract]:The Guang Zidan uranium deposit was discovered by Guangxi S310 nuclear geological team in 1972. The total amount of drilling work was 125198.60m and the pit exploration work was 2362.97m. the detailed investigation of Guang Zi Tian uranium deposit in Guanzhou County, Guangxi was submitted in December 1994. The scale of the deposit is medium, The deposit type is carbonate rock type. From October 2006 to November 2011, Guangxi Sany 10 nuclear geological team completed the drilling work of 18170.98 m, which enlarged the size of the Guangzidan uranium deposit to a large scale. The occurrence and spatial morphology of ore bodies are strictly controlled by tectonic belts, which mainly occur in the F _ 1 interlayer fracture zone and its upper and lower subzones, and the main orebodies are layered, and the small ones are mostly lenticular. The highest controlled elevation of orebody is 400m, the lowest controlled elevation is -640m, and the vertical range of mineralization is 1000 mm. The degree of geological work within the scope of resources verification is above the level of detailed investigation, and the deposit belongs to a large scale and medium grade carbonate type complex uranium deposit. Through the feasibility study, it is found that the internal and external conditions of mining area development are good, the exploitation and utilization of ore deposits are technically feasible and economically feasible, and the economic benefits of exploitation are good. The Guangzitian deposit is located in Guangzitang Village and its vicinity in the city of Quanzhou County at the direction of 334 掳25km. It is under the jurisdiction of Daxijiang Town and Longshui Town in Quanzhou County. The ore of Guangzidan deposit is analyzed and studied by means of modern technical test experiments, so as to find out the technological mineralogical characteristics of ore and the existence form of uranium, and to probe into the metallogenic mechanism of the deposit. The main conclusions are as follows: (1) the ore area is located in the eastern margin of the Yuechengling fault fold belt and the western part of the mining area is exposed to Caledonian and Yanshanian granites. The fault zone of the west wing of the Daxijiang-Longshui syncline basin is the main ore-bearing structure in the whole exploration area. (2) the ore types and mineral components are divided into three natural types according to the characteristics of ore-bearing rocks. (1) broken dolomite ore: due to the difference of hematite and carbonaceous content, it presents different colors, such as gray and white, gray and black, brick red and so on. The network vein fissures, scratches, graphitization specular surface are often seen in the ore. Uranium mainly exists in asphaltene uranium deposit, and it is veinlike. The metal minerals symbiosis with uranium ore include pyrite, hematite, limonite, etc. (2) structural mud ore: the ore is bluish gray. Grayish green, pig liver and other miscellaneous colors. Uranium mainly exists in the structural mud ore in the form of dispersion adsorption. (3) the crushed muddy siltstone ore, occurring in the lower part of F1 main belt, is turquoise grayish green and has a patchy structure. Uranium mainly exists in asphaltene uranium deposits and uranium black. The metal minerals associated with uranium deposits include pyrite, hematite, limonite and so on. (3) most of the carbon-siliceous mudstone type uranium deposits in Guangzidan are multi-source, multi-period and multi-genetic uranium deposits. And the hydrothermal solution (hot water) was transformed into ore-forming because of the main, superimposed precipitation and enriched. (4) according to the research summary, The main formation experiences of the Guangzidan deposit are as follows: (1) uranium preenrichment during sedimentary diagenesis; (2) late geological processes forming migration channels and uranium storage spaces; (3) hydrothermal superposition transformation to mineralization.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P619.14

【相似文献】