广东大宝山铜钼多金属矿床构造蚀变调查与找矿预测

发布时间：2018-06-22 00:29

本文选题：大宝山矿区 + 斑岩型钼矿床　；参考：《中国地质科学院》2015年硕士论文

【摘要】：广东大宝山铜钼多金属矿床是我国南岭地区重要的多金属硫化物矿床之一,近年来,随着全国危机矿山接替资源找矿项目不断深入,国家及矿山部门逐步加大了对矿区深部及外围找矿工作的投入,取得的丰硕的研究成果。本文在查阅前人研究资料的基础上,发现其中仍存在一定的遗漏,前人尚未对矿区内的主要控矿构造特征和围岩蚀变与矿化和矿体之间的空间关系进行细致厘定。因此,本文选用“广东大宝山钼多金属矿床构造蚀变调查与找矿预测”为题,来对前人研究进行简单补充,并为后期的科研和生产提供重要的参考价值。在矿区内2条总长约1.6km的构造-蚀变-岩相实测剖面基础上,系统开展了岩相及岩石学研究,建立相应的蚀变矿物组合,并以此为填图单元修编了面积约为3km2的“大宝山矿区构造蚀变岩相图”。同时结合构造演化与岩浆活动关系,进一步探讨了大宝山矿区深部及外围的找矿预测研究。论文取得以下主要成果及进展： 1、从断裂构造控矿入手,通过详细的构造特征观察,认为大宝山矿区似层状铜多金属硫化物矿床赋矿断裂以北北西向断裂带为主,从构造动演化特征,解释控矿构造形式、性质以及叠加复合对成矿的控制,较系统地研究各类控矿构造特征。 2、在大宝山铜钼多金属矿床“灰岩(泥质灰岩、泥质粉砂岩)层位+燕山期的花岗质岩浆+NNW向断裂破碎带”的“三位一体”及蚀变带的四维控矿条件下,解释了夕卡岩型铜多金属硫化物矿床产出有利因素。 3、通过实测矿区内2条典型地质剖面,对剖面中不同类型蚀变岩进行岩石学、矿物学研究,从岩石的矿物组成及结构构造等角度,厘定了矿区南北采场发育的矿化蚀变带。系统提出不同类型蚀变带的野外划分标志,包括各蚀变岩的颜色、结构、构造、产状和矿物组合特征等。以此为基础修编了大宝山矿区1：5000大比例尺构造蚀变岩相图。 4、建立了由矿化中心向外以“透闪石一阳起石矽卡岩带→透辉石矽卡岩带→弱矽卡岩化带→硅化带或大理岩化带”为找矿标志的蚀变分带模型。指导矿区深部找矿预测工作。 5.首选白面山地区作为大宝山矿田内重要找矿远景区,完成该地区1：5000大比例尺构造-蚀变-矿化-岩相填图,在此过程中建立起白面山找矿预测区的找矿标志,从而确认在该地区榕树下一带深部可能存在中-低温夕卡岩型铅、锌、银多金属矿床。
[Abstract]:The Dabaoshan copper-molybdenum polymetallic deposit in Guangdong is one of the important polymetallic sulfide deposits in Nanling area of China. The state and the mining department have gradually increased the investment in the deep and peripheral prospecting work of the mining area, and obtained fruitful research results. On the basis of consulting the previous research data, it is found that there are still some omissions, and the main ore-controlling structure characteristics and the spatial relationship between the wall rock alteration and mineralization and orebody have not been determined in detail. Therefore, this paper selects "structural alteration investigation and Prospecting Prediction of the Molybdenum Polymetallic Deposit in Dabaoshan, Guangdong Province" as the title, to make a simple supplement to the previous research, and to provide important reference value for the later scientific research and production. Based on two 1.6km tectonic-alteration lithofacies profiles in the mining area, lithofacies and petrology are systematically studied, and the corresponding altered mineral assemblages are established. The structural alteration lithofacies map of Dabaoshan mining area with an area of about 3km2 has been compiled by using this method as a mapping unit. Combined with the relationship between tectonic evolution and magmatic activity, the ore-prospecting prediction in the deep and outer parts of Dabaoshan mining area is further discussed. The main achievements and progress in this paper are as follows: 1. Starting from the ore-control of fault structures and observing the detailed structural characteristics, it is considered that the NW fault zone of the ore-bearing deposits in the Dabaoshan copper polymetallic sulphide deposit is the main one. From the characteristics of tectonic dynamic evolution, explanation of ore-controlling structure form, property and superimposed composite control on metallogeny, the characteristics of various ore-controlling structures are systematically studied. 2. In the Dabaoshan copper-molybdenum polymetallic deposit, "limestone" (argillaceous limestone), The "Trinity" of the Yanshanian granitic magma NNW fracture zone and the four dimensional ore-controlling condition of the altered zone are studied in this paper. The favorable factors for the occurrence of skarn copper polymetallic sulphide deposits are explained. 3. The petrology and mineralogy of different types of altered rocks in the profile are studied by measuring two typical geological sections in the mining area. According to the mineral composition and structural structure of rocks, the mineralized alteration zones developed in the north and south stope of the mining area are determined. The field classification marks of different types of altered zones are proposed systematically, including the color, structure, occurrence and mineral assemblage characteristics of each altered rock. Based on this, a 1: 5000 scale structural altered lithofacies map of Dabaoshan mining area was compiled. 4. The weakly skarn belt of diopside skarn belt with "tremolite-actinite skarn belt" from the mineralization center was established The alteration zoning model of the silicification zone or marble belt "is the ore-prospecting marker." Guide the deep prospecting and prediction work in mining area. 5. The first choice of Baimianshan area as an important ore prospecting area in the Dabaoshan Orefield is to complete the mapping of 1: 5000 large scale tectonics, alteration, mineralization and lithofacies in this area. In the process, the prospecting criteria of the prospecting and predicting area of Baimanshan are established. It is confirmed that there may be skarn type lead, zinc and silver polymetallic deposits in the deep part of Yaoshuxia area.
【学位授予单位】：中国地质科学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2

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