内蒙古达来庙地区1:5万矿调遥感蚀变信息提取

本文探讨了内蒙古达来庙矿调工作区乌兰德勒、准苏吉花、阿敏乌苏等钼矿床围岩蚀变的特征及遥感识别方法。通过采用主成分分析、比值以及主成份变换法等多种蚀变异常提取方法,提取了与钼矿化有关的围岩蚀变信息。经野外实地验证,发现了两个具有重要找矿价值的找矿靶区,经进一步勘查矿床规模已达中型。     

桃源地区围岩蚀变与铀矿化关系

桃源地区与铀成矿有关控矿因素较多,主要为岩体、构造、围岩蚀变控矿。围岩蚀变与铀矿化密切,区内围岩蚀变主要有硅化、赤铁矿化、黄铁矿化、钠长石化、萤石化、碳酸盐化、绢云母化、绿泥石化等。区内的胶状黄铁矿化、浸染状赤铁矿化、紫黑色萤石化以及钠长石化等,可作为主要找矿标志。通过研究来寻找围岩蚀变与铀矿化之间的关系,为找矿提供较好的识别标志。     

内蒙古自治区黄花窝铺乡达赖沟一带金矿地质特征及成因分析

本文通过对达赖沟一带金矿产出特征及矿石组分的研究,从金矿的成矿机制、矿化蚀变及围岩的关系等方面进行相应分析,判断该金矿床成矿类型属于热液—构造蚀变岩型。初步建立找矿标志,并提供找矿方向。     

内蒙古卯独庆金矿地质特征与找矿方向

卯独庆金矿位于内蒙古大青山中段,矿体产于古元古界二道凹群浅变质岩系中,金矿体主要受NW向断裂构造蚀变带控制。金矿化围岩蚀变包括硅化、黄铁矿化、绢云母化、绿泥石化、碳酸盐化等。卯独庆金矿成矿地质特征,矿床成因绿片岩型。本区具有较大的找矿潜力,在金异常区内的断裂构造及断裂构造中的多种蚀变组合(如黄铁绢英岩化)是金矿形成的重要标志,提出了本区该类型金矿的找矿方向。     

斑岩型铜矿研究现状

斑岩型铜矿是国内重要铜矿矿床类型,探明储量可观,分布较集中。因此,系统研究斑岩型铜矿矿床,对找矿具有重要的找矿意义。本文通过对斑岩型铜矿矿床资料的收集整理,总结了斑岩型铜矿的成矿地质特征、岩浆岩条件、围岩条件、围岩蚀变和矿化分带特征,同时对矿床的物质来源、成矿过程及成因作了相关介绍和总结。     

矽卡岩型金矿的成矿地质特征及成因综述

矽卡岩型金矿是我国重要金矿类型,探明储量可观,分布较集中。因此,系统研究矽卡岩型金矿床,对找矿具有重要的找矿意义。本文通过对矽卡岩型金矿床资料的收集整理,总结了矽卡岩型金矿的成矿地质特征、岩浆岩条件、围岩条件、围岩蚀变和矿化分带特征,同时对矿床的物质来源、成矿过程及成因作了相关介绍和总结。     

山东省百吉庄金矿围岩蚀变特征与金矿化关系初探

百吉庄金矿床位于山东省栖霞市境内,主要产于北东向的构造裂隙中,矿体严格受压扭性断裂构造控制,具膨胀收缩、尖灭再现等特点,围岩蚀变类型主要有硅化、绢云母化、黄铁矿化、黄铁绢英岩化、绿泥石化、碳酸岩化,其中黄铁矿化、绢云母化、黄铁绢英岩化与金矿化关系密切,认为矿床成因类型为蚀变岩型金矿床。本文通过对该矿床围岩蚀变特征与金矿化关系的阐述,为指导外围找矿具有重要意义。     

广东省罗定泗纶地区岩矿特征及其找矿意义

通过对罗定泗纶地区的岩性、蚀变等特征进行分析,区内主要出露一套变质岩石组合,变质作用复杂。区内原岩发生了多种类、多期次的围岩蚀变,主要蚀变类型为绢云母化和碳酸盐化,其次为硅化、粘土化。这些特征对指导下一步找矿具有重大意义。     

粤西金鸡金矿围岩蚀变特征与金矿化关系

金鸡金矿主要产于浅变质碎屑岩中的断裂破碎带内,严格受近南北向和北东向断裂破碎带控制。金矿常伴随围岩蚀变,研究围岩蚀变对金矿勘查具有重要意义。总结金鸡金矿,与金矿关系密切围岩蚀变主要有硅化、黄铁矿化和褐铁矿化。本文分析讨论了金鸡金矿的围岩蚀变类型、期次、分带性,同时对围岩蚀变与金矿化的关系进行了讨论。     

洛宁县龙门店银铅矿深部及外围地质特征与找矿标志研究

矿区大地构造处于崤山-鲁山拱褶断束的中部,熊耳山多金属成矿区之西部Ag-Pb-Au地球化学异常区。矿区内断裂构造相当发育,以北东向含矿蚀变断裂带最发育。硅化、方铅矿化、黄铁矿化和矿化关系密切,发现8条矿化蚀变带,矿体赋存于矿化蚀变带中,并严格受矿化蚀变带控制,圈出6个矿体,地层、构造、围岩蚀变等找矿标志明显。     

内蒙古克旗地区银、锡多金属矿土壤地球化学测量方法及找矿效果

在内蒙古克什克腾旗——白音查干地区,运用土壤地球化学测量方法发现了诸多以银锡为主的成矿元素异常带及找矿靶区,找矿潜力较大。通过1∶5万土壤地球化学测量工作,圈出了成矿元素异常靶区3处,经过1∶1万土壤地球化学测量,进一步缩小了找矿靶区,确定了成矿有利地段12处。经过地质填图及地表工程揭露,发现银、锡、铅锌矿(化)蚀变带20余条,其中,达到边界及工业品位的矿体5条,充分说明了土壤地球化学测量方法在半干旱风成砂覆盖的草原丘陵地区具有良好的找矿效果。     

新时期如何转变矿业经济发展方式

通过黄冈市矿产资源开发利用现状调查和研究,找出了开采和管理中存在的主要问题。这些问题是牵涉矿业生存和发展的大事大非问题,必须从地质找矿、矿产资源合理开发利用、矿山地质环境保护和矿政综合监督管理四个方面进行统筹解决。只有与时俱进,改革创新,转变矿业经济发展方式,整装勘查,科技创新,节约集约综合利用矿产资源,建设绿色矿山,打造和谐矿区,才能找出、管住和用好矿产资源,才能保护好矿山地质环境,才能实现矿业经济全面、协调、健康和可持续发展。     

China’s Belt and Road Initiative in Support of the Resourcing Future Generations Program

The Resourcing Future Generations (RFG) program is a global strategy proposed by the International Union of Geological Sciences to meet global demand for natural resources. The Belt and Road (B&R) initiative of China provides a great opportunity for promoting the RFG across much of the Eurasian continent. The countries covered by the B&R initiative are mostly low-income economies. With rapid developments of economy and infrastructure construction, these countries are set to have huge demands for mineral resources in the future. However, the proven mineral reserves in this region are too limited, and the region’s overall level of metal recycling is far from optimistic. These countries are expected to have obstacles in meeting future demands. However, the regional Tethyan metallogenic domain and Central Asia metallogenic district are key areas for new discoveries of mineral resources, possessing a variety of mineral resources with a positive prospecting potential. The B&R initiative of China provides favorable opportunity for mutual beneficial cooperation to improve regional exploration and prospecting through geological mapping, inter-comparison study on Tethyan metallogenic domain, joint assessment of mineral resource potentials, joint training of geological engineers and workers and building information systems.     

CHEMICAL WEATHERING PROCESSES ON THE VANTAGE PEAK NUNATAK,JUNEAU ICEFIELD,SOUTHERN ALASKA

On the Vantage Peak nunatak in the Juneau Icefield of southeastern Alaska, grus and soils display evidence of extensive chemical alteration in a self-evidently periglacial environment. Accompanying the alteration of bedrock to grus and soil is a decrease in grain size. Grus is dominated by very coarse sand while the soils are predominantly fine sand. Grain-size reduction is attributed primarily to mineral grain dissolution. Total chemical analyses show that alkali earths (calcium and magnesium) and alkalis (sodium and potassium) are lost as weathering progresses, while silicon and iron increase relative to resistant elements. Secondary clay minerals present in the grus and soils appear to have been derived from clay-size primary minerals. Vermiculite is the principal secondary clay mineral and appears to have formed by the alteration of biotite. Scanning electron microscopy shows that quartz and feldspars are primarily weathered by dissolution with no evidence of feldspar transformation to secondary clays. Superimposed on these weathering transformations is evidence of eolian processes. Chemical weathering processes, notably dissolution and clay mineral transformation, do occur in the periglacial environment of the Vantage Peak nunatak and are clearly an important component of the periglacial geomorphic process suite.     

The “Three-Component” Digital Prospecting Method: A New Approach for Mineral Resource Quantitative Prediction and Assessment

Stimulated by the exceeding progress of information technology, the development of mineral exploration has entered a new period of digitization and quantification. The “three components” approach of mineral prediction is suggested as a new approach to the “digital mineral prospecting,” which is based on the geoanomaly analysis, directed by the research on the diversity of mineralization and on the spectrum of mineral deposits. Close combination of these three aspects of quantitative study makes a new starting point to the digital prospecting. In this paper, the basic theories of the “three components” approach of mineral prediction are discussed. In addition, based on the new achievements in the studies on the prediction and assessment of solid minerals and gas–oil resources, we have centered our discussion on the thought of analysis of geoanomaly evolution and on the “5P” method for approaching the target area in the “three components” approach of mineral prediction.     

土壤地球化学测量在辽宁省开原市小甸子银金多金属矿区的找矿效果

在勘查区内通过1∶10 000土壤地球化学测量工作发现多处异常,结合区内成矿地质条件及矿种属性可将异常划分为3个异常区带,即西部HT1、东部HT2、南部HT3。经地表探槽工程揭露部分异常与已知矿体较为吻合,并且在勘查区东部HT2-3异常带内新发现4条蚀变岩型Zn矿体。土壤地球化学测量在该区地质找矿中发挥了重要的指导作用,取得了良好的找矿效果。     

论钾盐矿床的物质来源和找矿指示

讨论了钾及其有关物质的理化性质和行为规律,钾盐的物质来源,盐卤的变质,结晶分异,成矿条件和机制,认为富钾热液是形成钾盐矿床的重要的物质来源之一。矿物岩石流体包裹体的富钾成分、富钾热泉、富钾盐湖均是找寻钾盐矿床的重要指示。     

现代盐湖型钾盐成矿遥感预测——以扎布耶盐湖为例

通过遥感图像处理与目视解译,对扎布耶盐湖典型矿床从控矿构造、矿物质来源、湖盆封闭性和沉降性、地形地貌、水热活动、遥感色异常及退宿湖痕迹等因素进行了总结,初步建立主要盐类矿产资源的遥感找矿模式。经过综合分析,对比扎布耶盐湖典型矿床的成矿地质条件,以近矿找矿标志及遥感成矿信息为依据圈定了24个成矿条件优越、遥感找矿标志明显的区域为钾盐矿最小预测区。该研究可为矿产潜力评价及以后的工作奠定基础。     

柴达木盆地西部天青石矿区矿物学与元素地球化学特征研究

柴达木盆地天青石资源极为丰富,已发现有大风山、碱山、尖顶山等大型天青石矿床。通过元素分析、元素相关性分析、矿物组合分析等方法与手段,对柴达木盆地天青石矿区矿物特点及元素地球化学特征进行了研究。得到如下结论:大风山矿区以天青石—方解石—镁方解石矿物组合为主,矿物品位均值为59%;碱山矿区以天青石—文石矿物组合为主,矿物品位均值为39.6%;石膏、白云石在各矿区矿物均有分布,且含量较低。石膏与天青石成正相关关系,白云石的存在对天青石成矿来说是不利因素,铁白云石、文石和镁方解石的普遍存在可说明该区矿物成矿温度较高。Sr与S成正相关关系,证明Sr主要以天青石(硫酸锶)形式存在,锶与镁、钙成非线性关系,锶含量高则钙含量低,钙主要赋存在石膏中,而非方解石中。Sr/Ba比值、Sr/Cu比值分析表明该矿区经历过长期干旱的环境,Mg/Ca比值分析表明该区天青石成矿过程中微生物对其成矿作用起到了非常重要的作用。     

基于ICA的遥感蚀变信息提取方法的研究

在研究比较了ICA(独立成分分析)和PCA(主成分分析)方法的差异后,借鉴PCA提取遥感蚀变信息的应用方法,应用ICA的原理,提出了一种基于ICA的遥感蚀变信息提取方法.以ICA方法替代传统的PCA方法,进行遥感矿物蚀变信息提取实验.并以哈图金矿矿区为例,分别用ICA和PCA方法对ETM+影像提取羟基蚀变信息和铁染蚀变...