【作者】 王健；

【导师】 李佑国； 范洪海；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2011， 硕士

【摘要】 本文依托中国核工业地质局铀资源区域评价项目—“辽东预测工作区铀矿资源潜力评价”开展研究。论文大量搜集和系统整理分析了研究区的各类资料,并结合最新的研究成果,通过构建区域综合成矿模式,借助于计算机技术,实现了铀资源成矿靶区的预测。辽东地区铀资源成矿潜力预测、评价以地质理论为指导,深入开展区域地质构造环境及成矿规律的研究,总结重要典型矿床的成矿规律和铀矿化特征,在构建了辽东地区连山关和赛马两个重要矿床成矿模式的基础上,深入把握研究区成矿地质特征,构建了区域成矿模式图;充分挖掘地质、物探、化探及航磁、航放等综合找矿信息。以MapGIS和MRAS软件为技术平台,在提取地、物、化、遥以及航放等综合信息的基础上,运用数理统计分析的方法,筛选出混合花岗岩体、赋矿地层、含矿和控矿构造、航空放射性铀偏高场、水系沉积物氧化钾异常区和铀矿床(点)异常点,六条预测要素,利用特征分析法以及证据权法对研究区内有利铀成矿地段进行预测。依据圈定靶区的基本原则和规范步骤,初步圈定出有利成矿地段22片。后结合研究区实际成矿地质条件和野外调查资料,对靶区进行优选及合并,最终圈定远景区13片。按照成矿概率大小和实地的矿化线索,将其分为A、B、C类,其中A类靶区4片、B类靶区5片、C类靶区4片。A类靶区分布于已知矿床深部或外围,是找矿潜力最好的地段;B类靶区的各成矿要素配套齐全,部分有矿点或矿化点出现,是找矿潜力较有利的地段;C类靶区各成矿地质条件较好且位于航空放射性铀高场,但无矿化线索,具有一定的成矿潜力。在对整个区域的地质情况研究过程中,取得了以下几点认识:1、研究区内地质演化复杂,矿床类型多样,铀矿床有单铀型矿床(连山关)、铀—钍—稀土混合岩矿床(赛马)、铀铁型矿床(高家沟、弓长岭矿床)。此外,区域上还分布有金、银、铅锌等矿种。2、辽东地区与中酸性岩体有关的铀成矿类型可分为两种:(1)花岗岩外带型:包括连山关、高家沟、玄岭后等矿床;(2)碱性岩型:主要为赛马矿床。3、铀成矿主要有2期,第一期为1900Ma,主要成矿类型为花岗岩外带型;第二期为210Ma,主要成矿类型为碱性岩型。4、本区明显存在着南部和北部两条东西向铀成矿带:与中酸性岩体成矿有关的为北带,鞍山-弓长岭-步达远构造成矿带,它是区内最重要的铀成矿带,控制了辽东地区的全部铀矿床。两条构造成矿带与“辽东裂谷”的南北边界相一致,其实质也就是裂谷边缘的深断裂控制了铀成矿带的分布。5、研究区花岗岩外带型铀矿化受太古代混合岩化花岗岩控制,主要分布在岩体内外接触带。6、碱性岩型铀矿化产于赛马碱性杂岩与辽河群大理岩的接触内带,主要赋存于草绿色霓霞正长岩中,其次是碱性矽卡岩。更多还原

【Abstract】 Rely on by the project, Uranium Potential Evaluation and Prospective Prognosis in Liaodong metallogenic belt from China Nuclear Geological Bureau, the paper has collected and studied a lot of geological data about study area. Combine the latest research achievements, establish integrated regional mineralization model, assess metallogenic potential and prospecting target area prognosis with computer software.Uranium Potential Evaluation in Liaodong metallogenic belt guided by the geological theory, making a study of geological environment, characteristic of uranium mineralization and metallogenic regularity at regional level. The paper has in the basis of summarized characteristics of Lianshanguan typical deposits and Saima typical deposits, established mineralization model of study area. Furthermore, analyzing such a wide range of data as geological, geophysical, geochemical and aeromagnetic data, etc. The software of MapGIS and MRAS serving as a basic platform, by the method of mathematical statistics analysis. These factors involve controlling-containing ore structures, uranium-rich strata and rocks, uranium deposits, uranium point and abnormal of airborne radiation. etc. Eventually, use the method of Characteristic Analysis and Weight of Evidence to positioning and evaluating metallogenic potential of study areas.Following the basic principles and instructions, the paper has delineated 22 favorable targets by means of Characteristic Analysis. Considering the actual geological conditions and field survey, the paper has in fact gotten 13 targets after winnowed. Besides, according to ore-forming probability and mineralization clues, the targets have been classified into three levels of A, B and C. Thus,4 pieces of targets lie in A category,5 pieces in B, and 4 pieces in C. The targets in the A appear the most favorable, which are mostly distributed around or outside the known deposits, whereas those within the B have relatively better conditions with all sorts of metallogenic factors and ore points, those within the C being potential to some extent.We have some following understanding, in work process, on the whole area geological conditions: 1. Study area have complex geological evolution and diversity ore types, uranium deposit including single uranium type (Lianshanguan), Uranium - thorium - rare earth mixed rock ore deposits (Saima), Iron type uranium deposits (Gaojiagou,Gongchangling). In addition, regional also distribution gold, silver, lead, zinc, etc .2. There are two kinds mineral type in intermediate-acid rock of Liaodong area:(1) Granite take-out type include Lianshanguan,Gaojiagou,Xuanlinghou etc. (2) Alkaline rock type include Saima.3. There are two Uranium metallogenic times,first time is 1900Ma, Main is Granite take-out type.Second time is 210Ma, Main is Alkaline rock type.4. There are two Uranium metallogenic belt: North belt and South belt. North belt have a close relationship with intermediate-acid rock metallogenic, It is name metallogenic belt. It controls all uranium deposits in Liaodong area. The two tectonic mineralization belt are consistent with two borders of Liaodong rift ,The essence is the Liaodong rift deep fault control the distribution of Uranium metallogenic belt.5. Granite take-out type of uranium mineralization in research area be controlled with Archaeozoic era mix granite,mainly distributed in internal and external contact belt.6. Alkaline rock type of uranium mineralization Originate in inside belt which Saima alkaline rock contact with Liaohe group of marble, Mainly occur in Viridans syenite.更多还原