大兴安岭突泉—林西成矿带北段斑岩成矿系统勘查模型与成矿预测

发布时间：2018-04-12 09:22

本文选题：斑岩成矿系统 + 勘查模型　；参考：《中国地质大学(北京)》2017年博士论文

【摘要】：斑岩成矿系统(包括斑岩型、矽卡岩型、浅成低温热液型矿床)涉及岩浆和热液作用,绝大多数的铜钼矿床和部分铅锌、金、钨等有色金属矿产资源与之相关。突泉-林西成矿带位于大兴安岭成矿带中段,该成矿带北部在找大中型矿床方面一直没有突破,但从该区成矿地质背景及成矿有利条件分析,该区寻找与斑岩成矿系统矿床成矿前景广阔,因此研究其勘查模型及成矿预测对于实现找矿突破具有重要意义和价值。通过研究,本次工作取得了如下认识:1、区内矿床类型主要分为斑岩型、矽卡岩型、浅成低温热液型共3种类型,研究工作对区内具有代表性的典型矿床进行了剖析,进一步明确了矿床地质特征、矿体特征、矿石特征及围岩蚀变特征,对矿床成因进行了论述,认为三种矿床类型均与中生代火山-岩浆活动有关。2、根据矿床(点)的分布位置及区域控矿构造,可将该成矿带划分为3个IV级成矿亚带。区内矿床成矿时间集中在171-110Ma之间,但从东向西,从北向南,成矿年龄有逐渐变新的趋势。区内矿床的成矿物质多来源于地幔岩浆。根据成矿地质背景与成矿环境、矿床的空间展布规律、与成矿有关的岩浆岩性质、生成时代、演化特点及不同类型矿种在矿床成因上的联系等,将区内矿产划分为4个成矿系列:(1)与燕山早期中酸性岩浆活动有关的铜、铅锌、银、锡矿床成矿系列;(2)与燕山晚期中酸性岩浆活动有关的铁、铜、铅锌、银、钼、锡矿床成矿系列;(3)与燕山期酸性岩浆活动有关的铜、铅、锌、钼、钨、金矿成矿系列;(4)与燕山晚期碱性花岗岩有关的稀有、稀土矿床成矿系列。3、研究表明,区内不同成因类型且彼此独立的矿床、矿点构成了一个完整的成矿系统,与其他地区的斑岩系统的成矿模型是类似的。4、建立了区域不同成因类型矿床的勘查模型,总结控矿因素和找矿标志。优选勘查技术方法,明确提出地质填图、地球物理勘查、地球化学勘查、遥感调查等组合方法作为勘查工作行之有效的途径。5、根据本次工作所取得的地、物、化、遥成果和区内矿床(点)特征,结合前人研究资料,提取了地物化遥多元信息。在多元信息集成的基础上划分了成矿远景区和找矿靶区,共圈定成矿远景区5处,其中Ⅰ级成矿远景区1处,Ⅱ成矿远景区3处,Ⅲ级成矿远景区1处;圈定找矿靶区4处,其中A级找矿靶区2处,B级找矿靶区2处。为在研究区找矿提供了基础资料,指明了方向。
[Abstract]:Porphyry ore-forming systems (including porphyry, skarn, epithermal hydrothermal deposits) are related to magma and hydrothermal processes. Most copper and molybdenum deposits and some non-ferrous metals such as lead, zinc, gold and tungsten are related to them.The Junquan-Linxi metallogenic belt is located in the middle section of the Daxinganling metallogenic belt. There has been no breakthrough in the prospecting of large and medium-sized ore deposits in the northern part of the metallogenic belt, but the metallogenic geological setting and metallogenic favorable conditions are analyzed.The prospecting and porphyry metallogenic system in this area has a broad metallogenic prospect, so it is of great significance and value to study its exploration model and metallogenic prediction for realizing the ore prospecting breakthrough.Through the research, we have obtained the following understanding: the deposit types in this area are mainly divided into three types: porphyry type, skarn type and epithermal hydrothermal type. The typical deposits in this area are analyzed.The geological characteristics, orebody characteristics, ore features and wall rock alteration characteristics of the deposit are further clarified, and the genesis of the deposit is discussed.It is considered that the three types of ore deposits are all related to Mesozoic volcanic-magmatic activities. According to the distribution of the deposits (points) and the regional ore-controlling structure, the metallogenic belt can be divided into three metallogenic subzones of grade IV.The ore-forming time in this area is concentrated between 171-110Ma, but from east to west, from north to south, the ore-forming age is gradually new.The ore-forming material of the ore deposit in this area mostly comes from mantle magma.According to the metallogenic geological background and metallogenic environment, the spatial distribution law of the deposit, the magmatic rock properties related to the mineralization, the generation age, the evolution characteristics and the relationship between different types of ore types in the genesis of the deposit, etc.The ore deposits in the area are divided into four metallogenic series: 1) Cu, Pb, Zn, Ag and Sn ore series related to the early intermediate acid magmatic activity in the early Yanshanian period) iron, copper, lead zinc, silver and molybdenum related to the intermediate acid magmatic activity in the late Yanshanian period,A series of copper, lead, zinc, molybdenum, tungsten and gold deposits related to the Yanshanian acid magmatism. The rare and rare earths related to the late Yanshanian alkaline granites. The metallogenic series of rare earth deposits.The mineral deposits of different genetic types and independent of each other in the area form a complete metallogenic system, and the metallogenic model of porphyry system in other areas is similar to that of the porphyry system in other regions. The exploration models of deposits of different genetic types in the region have been established.The ore-controlling factors and prospecting marks are summarized.Selecting the best exploration technology and methods, clearly putting forward the combination methods of geological mapping, geophysical exploration, geochemical exploration, remote sensing investigation and so on as the effective way of exploration work .5. according to the land, material and chemistry obtained by this work,The geophysical and chemical remote multivariate information is extracted from the remote results and the characteristics of the deposits (points) in the area, combined with the previous research data.Among them, A class prospecting target area is 2 and B grade prospecting target is 2.It provides basic data for prospecting in the study area and points out the direction.
【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2017
【分类号】：P612

【相似文献】