遵义锰矿地质特征及找矿潜力分析

遵义锰矿系指产于二迭系上统龙潭组底部以碳酸盐锰矿石为主的沉积型锰矿，几乎全部集中分布于遵义市及其附近地区。文章通过对遵义锰矿区域地质背景，矿区地质特征和矿体特征、矿床成因、找矿标志的分析，对该区找矿潜力进行了分析。     

威海东部地区金及多金属矿成矿规律及找矿方向

威海东部地区是金及多金属矿的有利成矿区。金矿化主要发育于新元古代荣成超单元的断裂破碎带中。银铜钼等多金属矿化主要发育于伟德山超单元的断裂破碎带或与古元古代荆山群的接触带中。荆山群是区内有利的矿化围岩,白垩纪青山群火山岩是铜矿化的有利层位。韧性剪切带及脆性断裂带等构造系统是含矿热液运移和富集的有利空间,控制着矿体的生成。该区具有较大的资源潜力和良好的找矿前景。本次研究是在野外调查和综合研究的基础上,通过分析控矿条件,研究矿床特征,总结成矿规律,为进一步找矿提出了建议。     

小兴安岭北部新民金矿床地质特征及成因

新民金矿床地处小兴安岭-张广才岭多金属成矿带北缘，矿床矿体赋存于光华组长石砂岩、粉砂岩、泥质粉砂岩夹凝灰岩中；金矿化三要表现为含矿岩石发生强烈硅化、黄铁矿化、毒砂矿化和金矿化，矿体呈脉状、扁豆状、透镜状等，规模相对较小；矿床形成明显与特定岩性有关，受断裂构造控制，矿石矿物组成简单且含量较低，矿石组构特征显示其属于浅成（低压）低温热液成因。     

甘肃寨上金矿床含金石英脉中锆石SHRIMP法U-Pb同位素测定及地质意义

寨上金矿床为西秦岭近年来新发现的大型微细粒浸染型金矿床。矿区出露的地层以泥盆系、二叠系为主，受近SN向挤压作用影响，普遍发生褶皱变形作用。对寨上金矿3件含金石英脉中的锆石样品的SHRIMP法U-Pb同位素年龄实验，结果表明：锆石U-Pb年龄有4个集中分布区间，分别为：1800～2000Ma、800～1000Ma、400～500Ma、300Ma；石英脉中的锆石均为捕获围岩的锆石，没有发现热液锆石；锆石U-Pb同位素年龄印证了矿区及外围缺失二叠系以后古生界及中生界的地层或岩浆岩。     

矿业软件在矿产储量评价中的应用

矿产储量评价的基本内容是建立矿床地质模型进行品位估计和储量分类分级．地质控制条件限制是矿床建模的重要手段。地质统计学方法是矿块品位估计以及储量分级等的有效方法．国内的应用实例表明。国际先进矿业软件是矿产储量评价的先进工具，应用矿业软件进行矿产储量评价是市场经济的需要。     

Application of marching cubes algorithm in visualization of mineral deposits

An implementation scheme of the marching cubes (MC) algorithm was presented for the visualization of mineral deposits. The basic principles, processes and pitfalls of the MC algorithm were discussed. The asymptotic decider algorithm was employed to solve the ambiguity problem associated with the MC algorithm. The implementation scheme was applied to model and reconstruct the surfaces of mineral deposits, using the geological data obtained from an iron mine in China. Experimental results demonstrate the ability of the implementation scheme to solve the ambiguity problem, and illustrate the effectiveness and efficiency of the MC algorithm in the visualization of mineral deposits.     

Coupling mechanism of mineralization and hydrocarbon-forming in hydrothermal convection system: An example from Longtoushan Sn-polymetal deposit, Dachang

Longtoushan Sn-polymetal deposit is a large-scale deposit of high-tenor. The ore-bodies occur in reef limestone of middle Devonian. There is much anthraxolite in reef limestone and ore-bodies. The anthraxolite is the postmature result of oil-gas’ thermal metamorphism. The close relationship of anthraxolite and Sn-polymetal deposit reveals the space-time relation between oil-gas evolution and Sn-polymetal mineralization. Sulfur isotope of Longtoushan deposit is close to oil’s sulfur in Devonian, which indicates obvious relationship between the sulfur’s source of deposit and oil-gas’ activity. The forming of Longtoushan deposit relates to exhalative-sedimentary mineralization in Devonian. Because of the favorable hydrocarbon-forming condition of Longtoushan reef and surrounding basin facies’ black shale and peat, coupling of ore-formation and hydrocarbon-forming occurs in seabed’s hydrothermal convection. The distributing of ore-forming elements indicates the presence of hydrothermal convection system. The thermal fluid containing organic matters conduces to Sn-polymetal elements’ activation and transfer, and provides catalyzing condition to the transforming from SO ₄ ²⁻ to S²⁻. The erosion action of brine containing organic acid to reef limestone induces the growing of crannies and karst’s caverns, which provides advantageous space to Sn-polymetal mineralization. The heat source of mineralization provides thermocatalysis condition to hydrocarbon-forming. When the circulatory fluid containing oil-gas enters the high-temperature region(>150°C), the oil-gas is decomposed and anthraxolite comes into being. Foundation item: Project(20030533012) supported by Specialized Research Fund for the Doctoral Program of Higher Education     

Thermal behaviors of deactivation catalysts for synthesizing 2, 3, 5-trimethylhydroquinone

The thermal behaviors of the deposits on supported noble metal catalysts for synthesizing 2, 3, 5-trimethylhydroquinone by DSC were studied. The results show that the supported Pd catalysts have two exothermic peaks at around 312 °C and 435 °C in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 °C. Therefore, it is supposed that the adsorptive states of deposits on supported Pt catalysts and supported Pd catalysts are different, which may be one reason leading to the stability difference between supported Pt catalysts and supported Pd catalysts.     

南澜沧江火山岩带铜成矿地质背景及找矿前景

南澜沧江火山岩成矿带位于特提斯亚构造域(东段)之澜沧江晚古生代-三叠纪火山岩浆弧带。成矿带构造复杂,岩浆活动频繁,矿产资源丰富,矿种和类型多,具有良好的成矿地质条件。成矿带内铜矿类型有火山岩及火山沉积型铜矿床;与酸性侵入岩有关的热液脉状型、矽卡岩型和斑岩型铜矿床,以及复合成因的脉状铜矿床。介绍了区带内相继发现的一批以海相火山岩型(大平掌、三达山等)、热(卤)水沉积-改造型和斑岩-火山岩型(民乐铜矿)为主的大、中型铜矿床;展望了澜沧江火山岩成矿带具有寻找火山岩型铜矿的良好前景。     

果洛龙洼金矿床地质特征及成因探讨

果洛龙洼金矿床是近年在东昆仑造山带东段新发现的一处中型金矿床,通过对矿床的成矿地质条件、矿床地质特征,成矿机理的分析和研究,认为该矿床由早期形成的热水沉积建造提供主要成矿物质来源,在后期动力挤压、变形、变质作用下,成矿物质富集,形成含金石英脉型、构造蚀变岩型、具有典型的韧性剪切带型金矿床特点。