新疆和田县阿合栏杆银铅矿矿床地质特征及成因探讨          下载免费PDF全文

刘坤  李霖  吴立新 《山东国土资源》2020,36(3):8-14

新疆阿合栏杆银铅矿床位于新疆维吾尔自治区和田县郎如乡,地处昆仑山脉东端,受喜玛拉雅板块活动影响,构造复杂,岩浆活动强烈,岩石普遍变质,属中-低温热液型脉状银铅矿床。矿体受构造控制,呈脉状、透镜状产出于断裂破碎带之中,断层总体走向NE,倾向NW,倾角50°~70°。区内圈出3个矿带,分别为Ⅰ,Ⅱ,Ⅲ。矿体厚度和品位沿走向和倾向变化不大,赋存标高+5110 m^+4870 m。矿石为富铅银贫锌的铅银矿石,矿体围岩为黑云母二长花岗岩。通过地质勘查工作,系统地控制了区内的浅部矿体,新增银铅矿矿石资源量146.6万t。该文通过对矿床浅部矿体的形态、规模、矿石质量、矿石类型、围岩、矿床成因及成矿规律的分析研究,发现矿体形态结构简单,矿化均匀连续,严格受岩浆、构造控制,通过地表探槽平硐揭露及深部个别钻孔验证,矿体有向深部延伸的趋势,表明该区深部和外围仍具有良好的资源前景,对今后的找矿具有重要的指导意义。  相似文献   

Classification,metallogenesis and exploration of silver deposits in Daxing’anling of Inner Mongolia and its adjacent areas     

《China Geology》2022,5(4):595-613

By the end of 2020, 83 silver deposits (or ore occurrences), including four super-large-scale deposits, nine large-scale deposits, 33 medium-scale deposits and 37 small-scale deposits or ore occurrences, have been proved. The amount of silver metal exceeds 86000 t with average grade of 100 g/t, which makes Daxing’ anling region one of the the most important silver ore belt in China. However, the metallogenic characteristics and metallogenesis need to be clarified. The silver deposits in the study area are classified into three main types, which are magmatic hydrothermal vein type, continental volcano-subvolcanic type and skarn type, respectively. The supergiant deposits include the Shuangjianzishan deposit (silver metal amount of 15214 t with average grade of 138 g/t), the Baiyinchagandongshan deposit (silver metal amount of 9446 t with average grade of 187 g/t), the Huaobaote deposit (silver metal amount of 6852 t with average grade of 170 g/t), and the Fuxingtun deposit (silver metal amount of 5240 t with average grade of 196 g/t). The silver deposits are mainly distributed in the central and south of the Daxing’anling area, and mainly formed in the Yanshanian period. The silver polymetallic deposits in the Daxinganling area are significantly controlled by regional faults and the junction zone of volcanic rock basins and their margins. The north-east trending deep faults are the most important ore-controlling structures in this area. The distribution of silver polymetallic deposits along the main faults is obvious, and the intersection area of multiple groups of faults often form important mine catchments. The Permian is the most important ore-bearing formation in this area, but some important silver polymetallic deposits occur in Mesozoic volcanic basins or pre-Mesozoic strata. The magmatic rocks related to mineralization are mainly intermediate acidic or acidic intrusions, intermediate acidic lavas, pyroclastic rocks, and small intrusions of ultra-shallow or shallow facies of the Yanshanian Period. The mineralization element combination is mainly determined by the elemental geochemical background of surrounding rocks or source layers. In addition, the type of deposit, the distance from the mineralization center, and the degree of differentiation of ore-forming rock mass are also important influence factors. The article analyzes the prospecting prospects of each silver deposit type in the study area, discusses the relationship between mineralization center and deep prospecting, and proposes that porphyry silver deposits should be paid attention to. In the prospecting and exploration of silver deposits, comprehensive evaluation and multi-target prospecting need to be strengthened because silver can coexist or be associated with a variety of metals.©2022 China Geology Editorial Office.  相似文献   

辽宁红透山块状硫化物矿床蚀变带元素迁移特征及定量计算   总被引：2，自引：1，他引：1  

郑远川  顾连兴  汤晓茜  吴昌志  李春海  刘四海 《矿床地质》2010,29(5):785-809

辽宁红透山块状硫化物矿床（MSD）位于华北地台东北部的浑北花岗岩-绿岩地体内,矿区岩石在30～28 亿年期间受到了600～650℃的高级角闪岩相变质。研究结果表明,广泛分布于红透山层状矿体下盘数百米处的和直接产于矿体下盘的堇青-直闪片麻岩,分别代表了变质后的MSD成矿系统以绿泥石化为特征的半整合和筒状不整合海底热液蚀变带。微量元素特征显示,层状堇青-直闪片麻岩的原岩并非同一种岩石,而是由5种不同岩性的岩石组成,筒状堇青-直闪片麻岩的原岩主要由流纹质岩石组成,而在堇青-直闪片麻岩走向上与之过渡的角闪片麻岩和黑云片麻岩则代表了不同岩性蚀变岩的未蚀变原岩。质量变化计算表明,相对于未蚀变原岩而言,两种蚀变岩的成分发生了显著变化,其中层状堇青-直闪片麻岩的Fe、Mg发生了富集,Na、K、Ca、Cu、Pb和Zn等元素被迁出,而筒状堇青-直闪片麻岩的Fe、Mg、Si、Na、Pb、Cu和Zn等元素则发生了富集,K被迁出。重稀土元素（HREE）和高场强元素(Zr、Ti、Nb、Hf和Ta)在海底热液蚀变过程中保持惰性,而Rb、Sr、Ba和轻稀土元素（LREE,尤其是Eu）则被强烈的迁出。这些元素变化特征表明海底热液蚀变以绿泥石化和硅化为特征,同时海底水-岩反应体系具有高水/岩比值。层状堇青-直闪片麻岩可作为红透山矿区成矿潜力评价的重要依据,而含硫化物石英脉的筒状堇青-直闪片麻岩不但本身可成为工业矿体,还可作为上覆层状矿体的近矿找矿标志。  相似文献   

ICP-AES法同时测定红土型镍矿中镍、钴、铁、镁研究   总被引：1，自引：0，他引：1  

张丽微  徐玉蓉  张微  李伟平 《云南地质》2010,29(3):346-350

通过选择分析谱线、处理样品方法和消除干扰因素等实验,建立ICP-AES法同时测定红土型镍矿中镍、钴、铁、镁4种元素的方法,解决利用常规化学法测定步骤繁琐,分析周期长,工作量大等问题,方法回收率为99.2%-105%,精密度（RSDn=10）为0.42%-3.89%。  相似文献   

云南龙陵勐糯铅锌矿床中镉元素赋存状况     

赵发  赵喷 《云南地质》2010,29(1):49-52

矿床中镉元素异常明显,以硫镉矿、不规则粒状、脉状充填嵌布于闪锌矿中。提出矿石生成顺序,为进一步找矿提供新依据。  相似文献   

云县邦东—景谷民乐地区火山岩型铜矿找矿前景   总被引：1，自引：0，他引：1  

段继云  李石英  杨文军 《云南地质》2010,29(2):128-131

本区位于滇西特提斯沟—弧—盆构造体系的主火山弧地体中,处于澜沧江褶断束东凸弧形转折处,上三叠统小定西组钙碱性火山碎屑岩、次火山岩含矿,火山机构控制矿体的产出形态,后期构造、侵入体使矿体叠加、富积,矿化类型为火山—次火山岩热液改造矿床;地、物、化、遥等成矿地质条件有利,具有很好的找矿前景。  相似文献   

地面高精度磁测在印尼滨海型磁铁矿应用     

胡维竹  杨茂齐 《云南地质》2010,29(2):197-200

综合运用低纬度化极与建立模型正演等数据处理手段进行隐伏矿体预测,发现与成矿有关的磁异常,显示良好成矿前景。钻孔证实有工业矿体。  相似文献   

香格里拉陆家村银金多金属矿矿化特征及找矿标志     

黄琴辉 《云南地质》2010,29(4):499-502

研究区浅部以断裂破碎带控制的热液脉型Cu、Au、Pb、Ag矿床为主,深部形成斑岩型Cu、Mo矿床。矿体受地层及断裂构造双重控制。硅化、黄(褐)铁矿化与矿化关系最为密切,是主要的围岩蚀变,亦为主要的找矿标志。  相似文献   

新平大红山铜铁矿床控矿因素及成因分析     

宁佐金 《云南地质》2010,29(4):409-415,381

大红山铜铁矿床是我国著名的大型铁铜矿床之一。对成矿地质背景、矿床地质、矿体特征等综合研究,分析矿床控矿因素,提出矿床成因为火山-喷发沉积变质型,建立了成矿模式。  相似文献   

云南江城岩脚铅锌矿控矿因素     

董诗位  田宗春  刘相琴 《云南地质》2010,29(4):424-428

矿床位于江城中新生代拗陷盆地,铅锌矿赋存于F1断层两侧景星组下段一、三、五岩段中,分砂岩型和角砾岩型。存在三种矿物组合,受盆地演化、构造、岩性控制明显。  相似文献