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引言澳大利亚东北部芒特艾萨的铜和银-铅-锌矿体,在沉积岩容矿的块状硫化物矿床中占据着特殊位置,它们都产在相同的建造(乌尔库哈特页岩)中,但它们之间有一定空间间隔,具有不同的容矿岩的特征。铅-锌矿体呈雁行排列在白云质页岩中,由层状方铅矿和闪锌矿层组成、Neudert(1983、84)根据沉积学分析认为,方铅矿和闪锌矿是在沉积地层中定位的,而不是沉积在沉积物-水界面上。为确定与变形历史有关的银-铅-锌矿体矿化时间,尚需进行详 相似文献
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对黔西北猫猫厂-榨子厂铅锌矿区地质特征及找矿方向的几点不同认识 总被引：1，自引：1，他引：1
阐述了前人对黔西北猫猫厂-榨子厂铅-锌矿床的控矿构造、矿体产出特征及深部找矿前景的地质认识。通过对该铅-锌矿区的F2断层的走向延伸及规模、榨子厂的采矿情况、猫猫厂Ⅰ号矿体和Ⅱ号矿体的产状等问题的重新认识和研究与分析,结果认为,矿区NE与NW向断裂构造是两个独立的控矿系统;猫猫厂浅部铅-锌矿体产于F1断层下盘,F1断层应为导矿构造,而非容矿构造;与滇东北矿山厂、麒麟厂铅-锌矿的对比而具有共性,但个性更明显;对猫猫厂—榨子厂矿区的找矿前景不应盲目乐观,但也不应放弃深部探索。 相似文献
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凤凰山Ag－Pb-Zn多金属矿床产在寒武系类复理石建造中，赋矿围岩为砂岩和页岩，矿体受北西西向的构造破碎带控制。含矿热液流体沿构造破碎带充填，形成规模较大的多金属矿床，矿床的形成具有多期多阶段的特征。银主要以银的独立矿物形式存在，和方铝矿、硫锰矿、闪锌矿、菱锰矿及黄铁矿的关系较为密切。主要的银矿物有辉锑铅银矿、深红银矿、杂辉锑银铅矿、捷辉锑银铅矿、柱硫锑铅银矿、脆银矿、辉锑银矿和银黝铜矿等。银矿物主要形成于石英-硫化物阶段和石英-碳酸盐、硫盐阶段。 相似文献
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西藏雄村斑岩型铜金矿集区是近年来西藏冈底斯斑岩铜矿带内发现的一处超大型铜金矿集区,其形成于与新特提斯洋向北的洋内俯冲作用有关的岛弧环境,成矿时代为中侏罗世。该矿集区位于冈底斯火山-岩浆弧的中段南缘,其南侧紧邻日喀则弧前盆地,目前探明Ⅰ(原命名为雄村铜矿床)、Ⅱ、Ⅲ号铜金矿体规模达大型-超大型,同时还存在多个矿化异常带。本文以雄村Ⅰ号矿体为研究对象,对雄村Ⅰ号矿体含矿斑岩、赋矿凝灰岩和主要硫化物的硫、铅同位素开展研究,结果表明:①含矿斑岩、赋矿凝灰岩和主要硫化物具有较为一致的硫同位素组成,δ34SCDT变化范围为-3.5‰～2.7‰,平均-1.07‰,十分接近于零,塔式分布效应显著,硫可能主要来自地幔;②含矿斑岩、赋矿凝灰岩和主要硫化物具有相对一致的铅同位素组成,均以放射性成因铅含量低为特征,206Pb/204Pb、207Pb/204Pb和208Pb/204Pb变化范围分别为18.369～18.752、15.473～15.589和38.389～39.1531,位于地幔与造山带铅演化线之间,并且相对靠近地幔铅演化线,显示出铅主要来源于地幔,可能有少量地壳物质的混染。通过西藏冈底斯斑岩铜矿带碰撞造山环境和岛弧环境(以雄村Ⅰ号矿体为代表)斑岩型铜矿床的硫、铅同位素组成特征对比,认为两者的成矿物质来源是相似的,碰撞造山环境的地壳物质混染较强烈,而岛弧环境的地壳物质混染较弱。 相似文献
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安徽安庆铜矿接触带三维形态及其控矿机制分析 总被引：1，自引：0，他引：1
安庆铜矿是长江中下游成矿带中规模最大的铜铁矿床,其绝大部分矿体产在月山岩体与三叠系灰岩的接触带上,矿体的产出位置及规模与接触带的特征密切相关。本文通过三维模拟的方法研究了岩体接触带的三维形态及其与安庆铜矿矿体空间定位的关系,认为:月山矿田的矿体分布极不均匀,绝大部分矿体产在形态复杂、产状显著变化的岩体东枝南接触带;安庆铜矿的控矿接触带形态从东到西具有阶梯状-阶梯状、舌状过渡-舌状的变化规律;阶梯状接触带的陡倾及由陡变缓的位置和舌状接触带的尖端处是主要的成矿部位。上述接触带控矿规律推测是区域构造应力场、岩体侵位、冷凝造成的局部应力场以及成矿流体共同作用的结果。 相似文献
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矽卡岩矿床的汇流扩容空间控矿机制及其对深部找矿的意义:以铜陵—安庆地区为例 总被引：12，自引：5，他引：7
本文以铜陵-安庆地区凤凰山铜矿和安庆铜矿为例,通过野外地质分析和计算模拟实验探讨了浅成岩体冷却过程中接触带上汇流扩容空间对矽卡岩矿体的控制.在风凰山矿田和安庆矿田,围绕新屋里岩体和月山岩体的接触带上矿体的分布极不均匀,形成大规模矽卡岩矿体的位置既与接触带本身的特征有关,也与构造变形有关.矿体的边界特征以及与矿体密切相关的角砾岩的特征表明水压致裂在赋矿扩容空间的形成过程中可能起重要的作用.矿体的围岩蚀变特征以及流体包裹体地球化学特征显示来自岩体和囤岩的流体的混合以及高压流体的减压沸腾可能是矿石沉淀的主要机制.新屋里岩体和月山岩体的同构造冷却过程力学变形-传热-流体流动耦合动力学计算模拟结果显示:所有矿体都位于汇流扩容空间内,且主矿体位于最大最强的汇流扩容带内,这表明力-热-流耦合作用形成的汇流扩客空间不仅控制了矿体的位置,也控制了矿体的规模.在铜陵-安庆地区开展深部找矿勘查,应该将重点放在大规模高强度的汇流扩容区,特别是还没有发现大规模矿体的汇流扩容区,凤凰山和安庆铜矿深部找矿已取得的成果证明了汇流扩容空间控矿模式对这一地区深部找矿勘查具有重要意义. 相似文献
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天柱大河边重晶石矿床铅同位素特征及来源探讨 总被引：12，自引：0，他引：12
对取自天柱大河边重晶石矿床的重晶石样品和含方铅矿黑色页岩样品进行了铅同位素测定与研究.结果表明,在 Zartman铅构造模式图中,重晶石矿石、含方铅矿黑色页岩和黑色页岩有大致相同的铅同位素分布区,均沿上地壳铅演化线分布,表明它们之间具有同源关系;重晶石矿石及其赋矿黑色页岩的铅同位素组成与基底地层的铅同位素组成在 Zartman铅构造模式图中具有完全不同的分布范围,表明重晶石矿石中的铅不大可能来源于基底地层;结合重晶石矿石及其赋矿黑色页岩的铅同位素组成在 Zartman铅构造模式图和Δγ-Δβ铅来源分类图的分布,天柱大河边重晶石矿床的铅主要具上地壳铅、壳幔混合的俯冲带铅和热水沉积作用铅的混合来源特点,这为天柱大河边重晶石矿床的热水沉积成因提供了铅同位素证据. 相似文献
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龙门上仓铅锌矿是广东省上仓式沉积改造型铅锌矿的典型矿床。通过对龙门上仓铅锌矿的矿床特征进行研究,综合前人的研究成果,归纳总结出该矿床的成矿要素,并且对矿床的成矿模式进行了初步探讨。研究表明,由大赛坝组构成槽部的开阔向斜以及南西翼帽子峰组层间破碎带构成的控矿构造是该矿的必要成矿要素。矿床成因属于岩浆热液—沉积改造型。 相似文献
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J. Schieber 《Mineralium Deposita》1991,26(4):290-297
Pyritic shale horizons of the Newland Formation (Belt Series, Mid-Proterozoic) show striking similarities to Proterozoic pyritic shales elsewhere that are host to major lead-zinc deposits, such as Mt. Isa and McArthur River. However, in contrast to these deposits the pyritic shales of the Newland Formation contain only minute quantities of lead and zinc. Elevated concentrations of lead and zinc are only found in pore spaces of intercalated sandstone beds. Petrographic and geochemical data indicate that pyritic shale deposition and elevated lead-zinc concentrations in sandstone beds are unrelated, that base metal mineralization is controlled by initial porosity, and that iron and base metals were derived from different sources.Petrographic studies show that base metal sulphides are diagenetic and resemble disseminated mineralization described from sandstone hosted lead-zinc and copper deposits in the Belt basin and elsewhere. The absence of orebodies of disseminated lead-zinc mineralization in sandstones of the Newland Formation may be due to a comparatively thin sedimentary sequence below the sandstone occurrences, as well as to unfavourable geometry and small volume of sandstone bodies. 相似文献
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The Woodlawn zinc‐lead‐copper deposit is one of a number of stratabound volcanogenic base‐metal deposits in the eastern part of the Lachlan Fold Belt. These deposits are commonly bandned and chemically zoned. They are copper‐rich at the base and lead‐zinc‐(barium)‐rich at the top. Alternatively, discrete copper‐rich, lead‐zinc‐rich and barium‐rich bodies may be developed. Oxide facies variants have been recognised at a number of localities. The deposits were formed in or adjacent to volcanic rifts during the Late Silurian. The Woodlawn deposit is located within the Captains Flat‐Goulburn Synclinorial Zone within a sequence of quartz‐feldspar porphyry, agglomerate, tuff, tuffaceous shale and black shale. 相似文献
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Seyed Ahmad Meshkani Behzad Mehrabi Abdolmajid Yaghubpur Younes Fadakar Alghalandis 《Journal of Geochemical Exploration》2011
In regional exploration programs, the distribution of elements in known mineral deposits can be used as a guide for the classification of deposits, search for new prospects and modeling ore deposit patterns. The Sanandaj–Sirjan Zone (SSZ) is a major metallogenic zone in Iran, containing lead and zinc, iron, gold, copper deposits. In the central part of the SSZ, lead and zinc mineralization is widespread and hitherto exploration has been based on geological criteria. In this study, we used clustering techniques applied to element distribution for classification lead and zinc deposits in the central part of the SSZ. The hierarchical clustering technique was used to characterize the elemental pattern. Elements associated with lead and zinc deposits were separated into four clusters, encompassing both ore elements and their host rock-forming elements. It is shown that lead and zinc deposits in the central SSZ belong to two genetic groups: a MVT type hosted by limestone and dolomites and a SEDEX type hosted by shale, volcanic rocks and sandstone. The results of elemental clustering were used for pattern recognition by the K-means method and the respective deposits were classified into four distinct categories. K-means clustering also reveals that the elemental associations and spatial distribution of the lead and zinc deposits exhibit zoning in the central part of the SSZ. The ratios of ore-forming elements (Sb, Cd, and Zn) vs. (Pb and Ag) show zoning along an E–W trend, while host rock-forming elements (Mn, Ca, and Mg) vs. (Ba and Sr) show a zoning along a SE–NW trend. Large and medium deposits occur mainly in the center of the studied area, which justify further exploration around occurrences and abandoned mines in this area. The application of a pattern recognition method based on geochemical data from known mineralization in the central SSZ, and the classification derived from it, uncover elemental zoning, identify key elemental associations for further geochemical exploration and the potential to discover possible target areas for large to medium size ore deposits. This methodology can be applied in a similar way to search for new ore deposits in a wide range of known metallogenic zones. 相似文献
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通过对桂平市四德铅-锌-铜矿床的区域地质背景、矿床地质特征、矿物组合及结构构造、成矿物质来源等的研究,初步认为其矿床类型为热水沉积型铅-锌-铜矿床。通过对该矿床的成矿条件、地球物理、地球化学特征等的分析,认为该矿床具大型规模的成矿前景。 相似文献
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新疆维权银多金属矿床地质特征及找矿方向 总被引：3，自引：3，他引：0
文章通过对维权银多金属矿床地质特征的认识,结合矿区矿石、岩石地球化学、稀土元素、微量元素以及硫同位素特征,初步认为该矿床为一个钙矽卡岩型银多金属矿床。区域性韧-脆性大断裂影响带中的华力西晚期花岗岩类岩体与石炭纪含钙质岩系的接触带附近是成矿有利部位;钙矽卡岩带、多金属矿化(孔雀石化、铅锌矿化等)、化探Cu、Pb、Zn、Ag等多金属异常组合、高磁 高重力 高极化 低阻的物探"三高一低"异常组合是最佳找矿标志。区内北部应主要寻找与剪切带成矿作用有关的金矿,南部应主要寻找矽卡岩型铜银多金属矿。 相似文献