【作者】 余旭辉；

【导师】 张术根；

【作者基本信息】 中南大学 ， 构造地质学， 2010， 硕士

【摘要】 宁镇中段铜多金属矿床处于长江中下游成矿带的东端,通过野外地质调查、室内地质、遥感成果研究,结合区内已有的物化探成果,取得以下几点认识：1、本文以接触交代型矿床的成因理论为研究基础,在研究了矿体的分布特征、矿石组构特点及矿物生成顺序,明确了区内铜多金属矿床的成因类型以接触交代型为主,兼具细脉浸染型和热液脉型；2、结合成矿系统稀土元素、稳定同位素、成矿元素等地球化学特征,认为铜多金属矿床的成矿物质来源主要受区内燕山晚期中酸性杂岩体的控制,其次是栖霞组碳酸盐岩地层的影响,区内近东西向、近南北向构造对成矿流体的迁移、富集和定位成矿提供有利的空间；3、区内铜多金属矽卡岩矿床的成矿过程划分为两个成矿期,即矽卡岩期和热液期,成矿条件归纳为岩浆、地层、构造和物理化学条件四方面。根据矿床成因类型、控矿因素、成矿条件和成矿过程,总结出成矿规律并依此建立了综合成矿模式。4、以多元信息成矿预测理论为指导思想,利用逻辑信息法提取获得的各类异常信息重叠最多的地段,认为是地质结构复杂的地段,也是矿床赋存的有利部位。通过地-物-化-遥多元成矿预测信息的综合,按照地质成矿条件有利程度、物化探异常强度与规模、环形构造发育程度、遥感解译蚀变显现强度与规模,构建了多元信息找矿模型,并进行综合判定成矿有利位置,在伏牛山北侧、宝华山、铜山南侧和东毛山的四个接触带部位,圈定出五个重点找矿预测靶区。经钻孔验证,伏牛山北侧接触带存在矽卡岩型铜多金属矿化,具有进一步沿接触带的有利部位找矿的前景,为该区寻找矽卡岩型矿床拓展了找矿空间,是宁镇中段铜多金属矿床采用多元信息成矿预测的有效方法。更多还原

【Abstract】 The middle segment of Nanjing-Zhengjiang copper polymetallic deposit is in the east part of Middle_Lower Yangtze metallogenic belt. Some conclusions have been acquired by researching on geological, remote sensing, geophysical and geochemical.1. Based on genetic theory of contact metasomatic deposits, the results suggest that contact metasomatic type is the the main metallogenic type by study on distribution characteristics of ore body, texture and structure of ores, and mineral paragenesis sequence. Meanwhile, there are veinlet disseminated type and hydrothermal vein type.2. Combined with the geochemical characteristics in REE, stable isotope and ore-forming elements of metallogenic system, it is considered that the sources of ore-forming materials mainly are from Yanshanian intermediate-acid magma. Qixia carbonate formation is the secondary metallogenic factor. Furthermore, the structures which are nearly EW and NS trending provide advantageous space for the migration, concentration and location of metallogenic fluid.3. The ore-forming process divides into skarn-stage and hydrothermal-stage. The metallogenic condition includes magma, strata, structure and physical chemistry. According to genetic types, controlling factors, ore-forming conditions and ore-forming process of copper polymetallic deposit, the metallogenic regularity has been summarized, and the metallogenic model has been set up by it.4. Based on the guiding ideology of multi-information metallogenic prediction theory, it is considered that the more overlapped anomaly information on using the logical-information method to extract, the more complex geological structures are there, and are beneficial for bearing orebody. Compared with the favorable degree of geological metallogenetic conditions, intensity and sale of geophysical-geochemical anomalies, development degree of circular structure, intensity and sale of RS-interpretation alteration, the favorable position of mineralization, the prospecting model of location prediction has been built. After comprehensively determining the favorable position for ore-forming and combining with the prospecting model, five prospecting targets in the contact zones has been delineated, which are in the north of Funiushan, Baohuashan, the south of Tongshan and Dongmaoshan. Drilling verifying showed that there is skarn-type copper polymetallic mineralization in the contact zones in the north of Funiushan. It is proved that multi-information metallogenic prediction is an available method for exploration in the middle segment of Nanjing-Zhengjiang.更多还原