斑岩型矿床——非传统矿产资源研究的重要对象

多年来, 斑岩型矿床在传统意义上被认为是铜和钼的主要来源.然而, 斑岩型矿床成岩成矿地质条件复杂, 矿化类型丰富, 尤其是对一些大型-超大型斑岩矿床, 均为多元素综合性的巨型矿床, 除传统意义上的铜、钼等矿产外, 非传统矿产的成矿-找矿潜力巨大, 包括: 金、银、锡、钨、铋、铅、锌、铼、铀、钴、硫、硒、碲、铂族元素、磁铁矿等, 金红石和稀有金属如钽、铌等也值得关注.开展斑岩型矿床成岩成矿地质背景、矿床地质特征与非传统矿产矿化富集分布规律研究, 总结斑岩型矿床非传统矿产资源潜力预测评价标志, 指导找矿预测与资源潜力评价, 具有重要的理论价值和现实意义.      

广东大宝山南部铅-锌多金属矿床地质特征及找矿方向

大宝山南部铅-锌矿床赋存于大宝山向斜内的中泥盆统东岗岭组下亚组碳酸盐岩地层中,矿床的形成与地层、构造、岩浆活动有关,通过对该矿床成矿特征及控矿因素的分析,对比矿区外围凉桥—新江、官坪—大镇两个有利成矿远景区的成矿地质条件,研究认为,这两个远景区的成矿地质条件与大宝山南部铅-锌金属矿床基本类似,在矿区外围多个矿化集中区中,最具找矿潜力。     

衡阳盆地盐田桥矿区地质-物化探综合找矿效果

盐田桥矿区位于铅锌多金属成矿富集区,成矿地质条件优越,矿区内铜多金属矿化受到断裂构造的严格控制。在306大队于矿区内开展的地质-物化探综合找矿工作的基础上,通过对该矿床进行地质特征分析、电法测量以及土壤地球化学测量,并结合矿床内岩(矿)石物性特征,认为矿床内矿体具有明显的一高(高幅频率)一低(低电阻率)地球物理特征和地表铅、锌、铜、钨等异常晕,并据此对盐田桥铜多金属矿床深部成矿潜力进行综合评价,为矿区下一步的地质找矿工作指明了方向。     

四川盐源磨耳哥地区铁多金属矿找矿前景分析

盐源县阿萨乡磨耳哥一带，铁、铜、铅、锌、金、银等多金属矿受地层、构造双重控制。通过对该矿集区区域成矿地质背景、含矿地层、控矿构造、矿化带特征、矿体特征、矿物组合、找矿标志等进行研究分析，认为该区成矿地质条件较好，通过进一步地质工作可望发现较大的铁多金属矿床。     

赞比亚罗恩(ROAN)铜矿床地质特征及找矿标志

罗恩铜矿床产于中南部非洲赞比亚-刚果(金)铜钴成矿带南东端卢安夏盆地的东端,为该成矿带内一个典型的铜矿床,其矿床分布和产状严格受区域构造、地层、岩相古地理条件控制。本文旨在通过对该矿床勘查、开采历史地质资料整理,研究其成矿规律、总结找矿标志,指导卢安夏盆地深边部找矿。经对罗恩铜矿床矿体就位空间、容矿岩石、控矿构造、矿化富集规律、矿化分带等特征的研究总结,建立了罗恩-穆利亚希盆地地质矿体模型,指出矿床位于盆地东南部紧窄部位,矿体定位于沉积建造盆内的下罗恩亚群RL6地层泥质板岩和白云质片岩中,明显受后期构造变形作用影响,含矿地层与褶皱同步褶曲、折叠形成厚大矿体,"盆"、"层"、"相"、"位"、"带"为该矿床的找矿标志。     

河南秋树湾铜(钼)矿床成因探讨

通过对秋树湾铜(钼)矿床地质特征的详细研究，着重对其成因进行相关研究和对比。结果表明，秋树湾铜钼矿化与花岗闪长斑岩在矿化蚀变分带特征、稳定同位素特征、稀土元素分布模式等方面具有成因联系，并符合斑岩型铜矿床的一系列特征。认为该矿床是复合斑岩型铜(钼)矿床，指出矿床及其外围具有大型规模找矿潜力。     

福建建瓯八外洋铅锌矿床地质特征及其成因分析

建瓯八外洋地区位于福建省重要的铜、铅、锌、金、银成矿远景区内,具良好的找矿前景。通过综合归纳矿区已有的地质资料,系统地阐述了八外洋铅锌矿区的地质和矿床特征,并通过区内及其外围宏观和微观信息的研究与对比,认为该矿床成因类型为海底火山喷发一沉积变质(热液改造)块状硫化物型矿床。     

内蒙古自治区锡林浩特市毛登锡锌矿地质特征

毛登锡锌矿位于内蒙古兴安岭晚古生代中生代铜、铅、锌、金、银、锡、铬（钼）成矿区大兴安岭中南部成矿带,哲斯乌兰浩特成矿亚带之黄岗梁甘珠尔庙突泉乌兰浩特铁、锡、钨多金属成矿带上,区域成矿地质条件好。在对该矿床开展详查工作的基础上,分析了矿床地质特征,指出矿区发育有利于多金属成矿的地层、构造和岩浆岩条件,分析了矿床成因,提出了找矿标志,对该区远景找矿具有一定的指导意义。     

额仁陶勒盖银矿床地质特征及找矿标志

内蒙古额仁陶勒盖银矿床是我国近年来发现的大型中低温热液型矿床。矿体呈脉产于上侏罗统塔木兰沟组火山岩中，矿化与燕山晚期花岗岩演化晚阶段的浅成侵入体－石英斑岩有关。阐述了矿床地质特征、原生异常特点等，并提出了找矿的地质地球化学标志。     

安徽枞阳牛头山铜矿床地质特征及找矿前景

通过对安徽枞阳牛头山铜矿床的区域地质背景、矿体赋存规律、矿化蚀变特征、矿石类型及结构构造等的综合分析研究,总结归纳出矿体赋存于上侏罗统龙门院组矿化蚀变带（“褪色”蚀变带）及部分断裂破碎带中,矿床属次火山岩期后中低温热液型。在此基础上分析了找矿前景,认为控制龙门院组矿化蚀变带中沿矿体倾向和走向的深部矿体,以及次火山岩体外侧构造破碎带控矿的脉状铜矿体,可作为今后进一步找矿的工作重点。     

Unity of the national and the international in the socio-cultural development of the peoples of the USSR

International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen.     

Report of the restudy of the defined global stratotype of the base of the Silurian System

The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs.     

Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth

It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T ₃ = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″.     

The Tendencies of the Development of the Mineral-Resources Sector at the Turn of the Century

Important tendencies in development of the world mineral-resources sector at the beginning of the 21st century were an increase in production and consumption of mineral materials differentiated by types of metals and nonmetallic mineral raw materials, by countries and regions, as well as the concentration of the production of mineral raw materials in a small number of countries, and a reduction in industrial reserves of minerals in the world economy, even at the current stage of their extraction. These tendencies should be taken into account in working out a strategy for development of the Russian mineral raw-material base.     

Causes of the famine among the rural population of the Sahelian zone of the Sudan

Taking the example of W Sudan, an analysis of the climatic incidents leading to the two recent famine disasters is made. On this natural background, the human side is investigated. Focus is directed towards the fragile economic structure of the famine-prone population groups. An early-warning system for famine in the Sahelian Zone is proposed taking grain production and storage, livestock development and the relationship between the prices of livestock and grain as major indicators.     

东濮凹陷北部沙河街组三段中亚段沉积环境分析

东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。     

On the consistency of proposed models for the Pyrenees with the structure of the eastern parts of the belt

The structure of the eastern Pyrenees consists mainly of south-directed thrusts involving basement and cover rocks. An antiformal stack developed by the piling up of basement thrust sheets which outcrop in the Axial zone. These structures account for a thin-skinned thrust model rather than a vertical fault model in which the Axial zone would be essentially autochthonous, and the North-Pyrenean fault the axial plane of a fan thrust system. New data from the Eastern Pyrenees and the thin-skinned model suggest that(1) the structure east of the Pedraforca nappe is similar to that of the Central Pyrenees; (2) the cover rocks of the South-Pyrenean units and of the Axial zone-after restoration—built up a northwards-thickening prism consistent with the existence of a unique Pyrenean sedimentary basin during Mesozoic time; (3) the Axial zone is only a complex antiformal stack developed as a part of South-Pyrenean system related to the Paleogene thrusting-tectonics. The Axial zone palaeogeographic area had no special meaning during Mesozoic time.     

郯庐断裂南段研究进展与断裂性质讨论

据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。