云南易门凤山铜矿床刺穿体构造及隐伏矿定位预测研究

【作者】 王雷；

【导师】 韩润生；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2010， 博士

【摘要】 论文结合导师承担的国家危机矿山接替资源找矿专项《云南省易门县三家厂铜矿床深部接替资源勘查新技术新方法应用研究》(项目编号：200653098)、国家科技支撑计划课题《东川-易门铜矿山深部及外围勘查技术研究》(项目编号：2006BAB01B09)及全国危机矿山接替资源找矿项目《西南地区层控型多金属矿床成矿规律总结研究》(项目编号：20089943)进行选题。论文对凤山铜矿刺穿体进行了详细研究,将刺穿体划分为控矿型与非控矿型两类,总结了两类刺穿体的空间分布特征、物质组分差异及元素地球化学特征,建立了两类刺穿体的识别标志；两类刺穿体及其围岩之间的元素地球化学变化规律表明控矿型刺穿体与成矿关系密切；在凤山铜矿深部发现辉长岩侵入体,总结了辉长岩的岩石学、地球化学特征；总结了凤山铜矿刺穿构造控矿规律及矿体定位机制,并应用刺穿体分类研究、构造岩-岩相学研究、构造地球化学研究方法组合对易门凤山铜矿进行了隐伏矿定位预测。(1)将刺穿体划分为控矿型与非控矿型两类,对比研究了两类刺穿体的宏观地质、岩石学、地球化学特征,建立了两类刺穿体的识别标志,提出了刺穿体的形成机理。(2)与成矿有关的元素和氧化物具有由控矿型刺穿体→硅化蚀变白云岩→青灰色白云岩迁移的特点,元素地球化学研究表明控矿型刺穿体与蚀变白云岩经历了强构造变形及热流体作用,与成矿关系密切；非控矿型刺穿体旁侧蚀变范围小,构造变形弱,不存在明显的热流体活动,与成矿关系不明显。(3)凤山铜矿床矿物的水平分带特征及构造地球化学异常特征反映矿液的流向为刺穿体→围岩。凤山铜矿床控矿型刺穿体中发现与成矿有关的岩浆热液活动,指示刺穿构造作用时期凤山铜矿发生了岩浆热液叠加成矿作用。刺穿体岩(矿)石组构特征反映刺穿构造改造过程中,流体萃取下伏地层成矿物质在有利部位成矿为凤山铜矿主要成矿作用方式。(4)在研究刺穿体、矿体及控制二者的构造之间关系的基础上,总结了易门凤山铜矿的矿体定位机制,控矿型刺穿体控制了凤山铜矿床的定位。(5)应用构造岩-岩相学方法及构造地球化学方法对易门凤山铜矿进行了成矿预测,建立了一套适合凤山铜矿床的找矿预测方法,据此确立了凤山铜矿床找矿方向、圈定了找矿靶区。更多还原

【Abstract】 The Doctoral dissertation topics based on the Projects of Superseding Resources Exploration for the State Crisis Mine-"The Deep Superseding Resources Exploration of application of new technologies in Sanjiachang copper deposit, Yimen, Yunnan Province(No.2006530098) "、National Science and Technology Support Program-"the research of deep and peripheral Exploration technology in Dongchuan-Yimen Copper belt (No.2006BAB01B09)" and Superseding Resources Explorration for the State Crisis Mine-"Summary of Metallogenic regularity ofStratabound Polymetallic deposits in the southwest of China (No.20089943)".By studying the diapir of Fengshan copper deposit Detailed. It divides the diapir into ore-type and non-ore-type. Summarizes the spatial distribution, material composition and geochemical characteristics between two types of diapir, established the identification marks of the two type diapir which play an important role in the depth ore-finding prognosis. Between the Two types of diapir and its adjacent rock element geochemistry variation show that the ore-type diapir is closely related with the mineralization. discovered deep gabbro intrusions in Fengshan copper deposit, summarizes the gabbro Characteristics of Petrology and geochemistry.Summarizes the diapir structural ore controlling regularily and Positioning mechanism of ore body in Fengshan copper deposit, and application the methods of classification of diapir, Diapir structure-facies and tectono-geochemical to localizate and prognosis of concealed orebodies in Fengshan copper deposit.(1) It divides the diapir into ore-type and non-ore-type. Comparison of the two types of diapir characteristics of macro-geological, petrology and geochemistry, established the identification marks of the two type diapir, and proposed the formation mechanism of diapir.(2) Elements and oxides related to mineralization has the characteristics of migration from ore-type diapir→Silicified dolomite alteration→dark gray dolomite, element geochemistry studies have shown that the ore-type diapir and alteration of silicified dolomite have experienced strong tectonic deformation and thermal fluids, and mineralization is closely related. non-ore-type diapir have a small range of lateral alteration, structural deformation is weak, there is no obvious thermal fluid flow, and mineralization is not obvious. (3) Fengshan copper deposit mineral zoning characteristics in level and tectono-geochemical anomalies reflect the flow of ore fluids from the diapir→adjacent rock. Discovered magmatic hydrothermal activity with copper mineralization in Fengshan copper deposit ore-type diapir. That indicated that diapir tectonic period occurred magmatic hydrothermal copper mineralization superimposed in Fengshan copper deposit. Body piercing rock (ore) fabric reflects Structural alteration in the process of piercing structure transformation, the fluid extraction of minerals in the underlying strata into favorable positions is the main mineralization in Fengshan copper deposit.(4) Based on researching the relationship of diapir、ore bodys and structure of controlling diapir and ore bodys, it summarizes the positioning mechanism of ore body in Fengshan copper deposit, the ore-type diapir control the positioning of Fengshan copper deposit.(5) Application of diapir structure-facies and tectono-geochemical to Metallogenic Prognosis in Fengshan copper deposit, and establishment of a suitable Prospecting Prognosis method in Fengshan copper deposit. whereby Established prospecting of Fengshan copper deposit, and enclosed prospecting areas.更多还原