唐古尔塔格硅灰石矿床地质特征与成矿条件分析

作者首次在该区找到了硅灰石矿。在专题研究基础上，分析了区域地层、构造、岩浆活动和硅灰石矿床地质特征等，提出该硅灰石矿主要产于康古尔断裂带内的花岗岩与碳酸盐地层接触带，属矽卡岩型硅灰石矿。对区内花岗岩、碳酸盐地层、矽卡岩、大地构造等硅灰石成矿条件作了分析，初步提出了该矿主要应用领域为建筑陶瓷工业。     

安徽省淮北地区矽卡岩型矿床成矿系列及成矿规律

淮北地区是皖北重要的铁铜成矿区,为系统总结该区矽卡岩型矿床成矿系列及成矿规律,基于近年来在该地区取得的找矿成果,通过系统研究已知矿床地质特征和成矿地质条件,结合成岩、成矿年代学特征,认为该区有3个成矿系列: 与高钾钙碱性侵入岩有关的矽卡岩型铁铜金成矿系列、与高钾钙碱性侵入岩有关的矽卡岩型铁-石膏成矿系列和与二长花岗岩有关的矽卡岩型铁-轻稀土成矿系列。分别论述了该区4个典型矿床的地质特征及成矿规律,认为该区为两阶段成矿,成矿空间受深断裂、弧形构造和岩浆岩带的共同控制。最终建立了该区早白垩世早期“前常式”、“杨桥孜式”和“王场式”铁多金属矿床和早白垩世晚期“旗杆楼式”铁-轻稀土矿床的区域成矿模式。     

基于特征分析法的琼南矽卡岩型矿床成矿预测研究

在系统总结琼南矽卡岩型矿床区域成矿地质背景与成矿规律的基础上,分析和提取了地质、物探、化探、重砂、遥感等多元有利找矿信息,具体包括碳酸盐岩地层、燕山晚期中酸性侵入岩、控矿断裂、航磁推断磁性蚀变带、化探Cu、Pb、Zn、Au、Ag单元素异常及Cu-W-Mo、Pb-Zn、Au-Ag组合元素异常、自然重砂Fe、Pb-Zn异常以及遥感羟基和铁染蚀变异常等。并利用上述找矿信息及6个模型控制单元(即已知含矿单元)建立了特征分析初始矿化模型M1,同时为解决模型M1中控制单元不足的问题,我们从中筛选了联系度f≥4的26个单元作为新的模型控制单元,重新建立了广义矿化模型M2,并据此圈定了4个A级、2个B和2个C级矽卡岩型矿床找矿预测靶区,为本区矽卡岩型矿床的找寻提供了重要的科学依据。     

我国矽卡岩型铜矿床同位素地质特征及其“三位一体”成矿模式

总结了典型折矽卡岩型铜矿床同位素地质地球化学特征，认为我国矽卡岩型铜矿床成矿岩体（＾８７Ｓｒ／＾８６Ｓｒ）ｉ一般在０．７０６￣０．７１０变化，岩体为幔壳混合源型。矿石铅同位素组成均匀、稳定，特别是铀铅，＾２０６Ｐｂ／＾２０４Ｐｂ＝１７．０７５￣１８．１００，＾２０７Ｐｂ／＾２０４Ｐｂ＝１５．３３７￣１５．６３５，比值变化小，而＾２０８Ｐｂ／＾２０４Ｐｂ比值变化稍大，矿石铅源主要来自成矿岩体。矿石δ     

矽卡岩型白钨矿矿床研究进展

矽卡岩型白钨矿是世界上最重要的钨矿类型,其储量约占钨矿总储量的一半.据统计,我国矽卡岩型白钨矿已占全国钨矿总储量的60%以上,因此,矽卡岩型白钨矿矿床的研究具有重要的经济和战略意义.前人对矽卡岩型白钨矿进行了广泛的科学研究并取得了众多的成果.本文在查阅整理前人资料的基础上,对矽卡岩型白钨矿矿床的时空分布、矿床地质特征、成矿与花岗岩的关系、成矿流体特征及成矿机制、成矿物质来源,国内外矿床对比等方面进行了综述,阐明了矽卡岩型白钨矿矿床的研究进展.     

中国东部环太平洋带某些非金属矿的分布规律

一、地质背景中国东部环太平洋带某些非金属矿的分布规律是由中国大陆板块的地质发展历史所决定的。中国大陆板块是现代欧亚大陆板块的一个组成部分,但在地质历史中它有着自己的发展特点,可视为一个独立组成部分。以天山—阴山、昆仑山—秦岭—大别山、唐古拉山—横断     

太平洋大金环的基本特征

太平洋大金环由苏联М.И.齐克松于1979年在《太平洋区成矿分带》一书中提出,最近十年来太平洋地区进行了许多金矿地质和找矿工作。笔者认为,这一理论对普查金矿有一定的指导意义。笔者根据有关资料探讨了伊齐克松留下来的大金环的三段空白区,论证了大金环的可能连续性。笔者对伊齐克松反复强调的太平洋成矿带和大金环的不对称性问题提出修正意见,认为不对称现象往往是工作程度和研究程度不够的反映,是重要的预测目标和工作突破口。     

Gold deposits in dikes of the Yana-Kolyma belt

The ore-bearing dikes widespread in the Yana-Kolyma metallogenic belt vary in composition from granite porphyry to lamprophyres, gabbromonzonite, and dolerite. The dikes make up suites tens of kilometers in extent and up to 8–10 km wide or fields a few thousand square kilometers in area. Previously, the ore mineralization was traditionally referred to the gold-quartz type superimposed on dikes. However, isotopic and thermobarogeochemical data indicate that the mineralization is close to an intrusion-related gold deposit. A deep magma chamber could have been a source of sulfur in sulfides from beresites and quartz veins hosted in the Kolyma dikes. The deposits considered in the paper are permissive for large economic reserves with low and medium Au grades.     

矽卡岩矿床中共生单斜辉石一石榴子石特征及其地质意义

通过对我国与Fe,Cu,Mo,W,Sn等主要矿化类型有关的矽卡岩的研究,揭示出不同矿化类型的矽卡岩有其特定的共生单斜辉石-石榴子石矿物对的成分特征、含铁率比值及其变化规律。依据Fe、Al等组分在共生单斜辉石-石榴子石间的分配,估算各种矿化类型矽卡岩形成的氧逸度和酸度条件,从而划分出我国含矿矽卡岩的氧逸度—酸度相。不同矿化类型的矽卡岩共生单斜辉石-石榴子石的成分特征、形成环境及其变化规律密切联系于其成矿母岩特征、成因类型和成岩条件。     

Gold-quartz ore deposits of Yana-Kolyma belt

Types of ore deposits, their regional distribution, mineral associations, textures and structures are described. Ores are of Cretaceous age, posterior to batholithic granite intrusions (Jurassic). Mineralizing solutions originated in consequence of metamorphism and dehydration of sedimentary geosynclinal rock masses, and are not directly related to granitoids. Ore matter was transferred by hypogene solutions in colloidal state, and vein bodies necessarily passed through the state of water-saturated gel. --B. V. Brajnikov.     

武当-桐柏-大别成矿带铜矿成矿规律

武当-桐柏-大别成矿带可分为南秦岭造山带、北淮阳构造带、桐柏-大别构造带三个二级构造单元,在南秦岭造山带广泛分布变质热液型铜矿,北淮阳构造带内产出VMS型、岩浆熔离型及斑岩型铜矿,桐柏-大别构造带则分布有岩浆热液型和矽卡岩型铜矿。构造单元的性质对区内产出的铜矿类型具有较强的控制作用。变质热液型铜矿主要与浅变质作用有关,变质流体以断层为运移通道并最终就位于黑色岩系内的次级断层。VMS型、岩浆熔离型、斑岩型铜矿与岩浆作用密切相关,产出在岩体内部及与围岩的接触带。岩浆热液型及矽卡岩型铜矿形成于岩浆作用晚期阶段,分布在岩体与围岩接触带及附近构造裂隙带等部位。     

Syenite-associated disseminated gold deposits in the Abitibi greenstone belt, Canada

A distinct group of gold deposits in the Abitibi greenstone belt is spatially associated with quartz-monzonite to syenite stocks and dikes. The deposits occur mainly along major fault zones, in association with preserved slivers of alluvial-fluvial, Timiskaming-type, sedimentary rocks. The deposits consist of disseminated sulfide replacement zones with variably developed stockworks of quartz-carbonate-K-feldspar veinlets, within zones of carbonate, albite, K-feldspar, and sericite alteration. The syenitic intrusions are broadly contemporaneous with deposition of Timiskaming sedimentary rocks and, together with disseminated gold mineralization, they have been overprinted by subsequent regional folding and related penetrative cleavage. Disseminated gold orebodies occur within composite syenitic stocks or along their margins, along satellite dikes and sills, and along faults and lithologic contacts away from intrusions. Orebodies in these different positions are interpreted to represent proximal to distal components of large magmatic-hydrothermal systems centered on, and possibly genetically related to, composite syenitic stocks.     

钦-杭成矿带主要金属矿床成矿系列

钦-杭成矿带是华南地区最重要的Cu-Pb-Zn-Au、W-Sn-Bi-Mo和Fe-Mn-S多金属成矿带。在前人工作基础上,根据矿床的成因组合、形成构造环境及其随地质历史演化的特点,将钦-杭成矿带主要金属矿床归纳为中新元古代海底喷流沉积型铜多金属矿床、新元古代海相沉积-变质型铁锰矿床、古生代海相沉积-叠生改造型铜铅锌铁锰矿床、加里东期与花岗岩类有关的钨钼金银多金属矿床、印支期与花岗岩类有关的钨锡铌钽铀多金属矿床、燕山期与花岗岩类有关的铜铅锌金钨锡多金属矿床、与区域动力变质热液作用有关的金银矿床等7个矿床成矿系列。进而讨论了各成矿系列的主要矿床类型、矿床地质特征和时空分布规律,初步认为,中新元古代海底喷流沉积型块状硫化物铜多金属矿床与大陆边缘岛弧火山作用有关,主要分布于扬子陆块东南缘和华夏陆块西北缘古岛弧褶皱区;新元古代受变质铁锰矿床与大陆裂谷火山作用有关,并经受了后期区域变质、热变质作用的改造,主要分布于加里东期隆起区;古生代层控型铜铅锌铁锰矿床与海底热水沉积成矿作用有关,且不同程度地受到后期岩浆-热液活动的叠加改造,主要分布于海西—印支期坳陷区与隆起区的过渡部位;加里东期斑岩-夕卡岩-热液脉型钨钼金银多金属矿床与奥陶纪末—志留纪陆内造山作用有关,主要分布于加里东期隆起区;印支期斑岩-夕卡岩-热液脉型钨锡铌钽铀多金属矿床与印支板块向华南板块的俯冲碰撞有关,成矿作用发生在后碰撞伸展阶段,主要分布于海西—印支期隆起区边缘;燕山期斑岩-夕卡岩-热液脉型铜铅锌金钨锡多金属矿床与岩石圈伸展引起的玄武岩底侵作用有关,广泛分布于海西—印支期拗陷区或中生代盆地边缘;与区域动力变质热液作用有关的金银矿床成矿系列,与印支—燕山期大规模的逆冲推覆作用有关,主要发育于钦-杭结合带两侧古陆边缘。     

Volcanic-hosted massive sulfide deposits in the Murchison greenstone belt, South Africa

The Archean Murchison greenstone belt, Limpopo Province, South Africa, represents a rifted epicontinental arc sequence containing the largest volcanic-hosted massive sulfide (VMS) district in Southern Africa. The so-called Cu–Zn line is host to 12 deposits of massive sulfide mineralization including: Maranda J, LCZ, Romotshidi, Mon Desir, Solomons, and Mashawa with a total tonnage of three million metric tons of very high grade Zn, subordinate Cu, and variable Pb and Au ore. The deposits developed during initial phases of highly evolved felsic volcanism between 2,974.8 ± 3.6 and 2,963.2 ± 6.4 Ma and are closely associated with quartz porphyritic rhyolite domes. Elevated heat supply ensured regional hydrothermal convection along the entire rift. Recurrent volcanism resulted in frequent disruption of hydrothermal discharge and relative short-lived episodes of hydrothermal activity, probably responsible for the small size of the deposits. Stable thermal conditions led to the development of mature hydrothermal vent fields from focused fluid discharge and sulfide precipitation within thin layers of felsic volcaniclastic rocks. Two main ore suites occur in the massive sulfide deposits of the “Cu–Zn line”: (1) a low-temperature venting, polymetallic assemblage of Zn, Pb, Sb, As, Cd, Te, Bi, Sn, ±In, ±Au, ±Mo occurring in the pyrite- and sphalerite-dominated ore types and (2) a higher temperature suite of Cu, Ag, Au, Se, In, Co, Ni is associated with chalcopyrite-bearing ores. Sphalerite ore, mineralogy, and geochemical composition attest to hydrothermal activity at relatively low temperatures of ≤250 °C for the entire rift, with short-lived pulses of higher temperature upflow, reflected by proportions of Zn-rich versus Cu-rich deposits. Major- and trace-metal composition of the deposits and Pb isotope signatures reflect the highly evolved felsic source rock composition. Geological setting, host rock composition, and metallogenesis share many similarities not only with Archean VMS districts in Canada and Australia but also with recent arc–back-arc systems on the modern seafloor where fragments of continental crust and areas of elevated heat flow are involved in petrogenetic and associated metallogenic processes.