辽宁省泉眼沟硅灰石矿床地质特征及找矿方向

泉眼沟硅灰石矿床是近年来发现的特大型矿床,区域上与吉林省大顶子、北崴子等矿床同处于吉黑褶皱系构造隆起带的南缘,是我国硅灰石矿最重要的成矿带和主要产区之一.该区矿体多呈层状、似层状赋存于古生界富拉堡子岩组硅质大理岩中.硅灰石矿体主要有4种矿石类型,即方解石-硅灰石型、硅灰石型、石英-硅灰石型和方解石-石英-硅灰石型.矿物组分有硅灰石、方解石、透辉石、钙铝榴石、石英,少数样品含黄铁矿、金、钼等.经研究和分析认为,区内硅灰石矿床是多期次和多阶段岩浆热液活动的产物,成矿作用与三叠世中、酸性侵入岩关系密切,矿床类型属层控接触热变质型.     

蒙山南部浒溪硅灰石矿床地质特征及控矿因素

浒溪硅灰石矿床位于江西蒙山南部,紧邻石竹山硅灰石矿南东角。本文以浒溪矿区野外钻探成果为第一手资料,以周边矿区资料为辅,总结了浒溪硅灰石矿床地质特征,分析了浒溪硅灰石矿控矿因素。研究表明:浒溪矿区硅灰石矿主要为接触热变质型矿床,硅灰石成矿物质来源为中二叠统茅口组含燧石结核灰岩;硅灰石成矿热量来源为印支期的蒙山岩体;区域的滑覆构造体系形成的各种次级裂隙能使CO_2逸出,有利于成矿;蒙山南部第四系覆盖区域深部仍具有较大的隐伏硅灰石矿找矿前景。     

浙北李家巷一带硅灰石矿的成因,控矿因素及找矿条件

层控接触变质型硅灰石矿床的形成,取决于成矿原岩、岩体侵入形成的面型热变质及一定的构造裂隙系统.     

皖南南山钨钼多金属矿地质特征及控矿因素

南山钨钼多金属矿是皖南近年来的找矿成果之一。矿体主要赋存于岭脚黑云母花岗闪长岩体北、南部变质接触带内的寒武系杨柳岗组和震旦系兰田组地层内。矿床的形成得益于岭脚岩体的侵入,促使钨、钼等元素大量进入热水溶液,形成含矿流体,同时伴随着北东向断裂的活动,矿液得以运移至由成分复杂的碳酸盐岩矽卡岩化形成的角岩类中富集成矿。南山钨钼矿床是岭脚岩体的侵入作用、热液蚀变作用、围岩条件、热液运移和区域构造活动等因素综合作用的结果,是受一定层位控制的接触变质-中高温热液充填交代型矿床。本文中,笔者通过对南山钨钼矿床地质特征及控矿因素和矿化富集规律的分析,总结了区域上寻找该类矿床的找矿标志,为皖南地区进一步的地质找矿提供实践经验和理论依据。     

湖南九曲岭地区铀矿化产出环境分析

文章阐述了九曲岭地区铀资源前景的调查成果,初步确定了构造有利岩性热变质带热液脉体及蚀变相互匹配是本区铀矿化产出环境的基本特征。控(含)矿构造与寒武系有利岩性、产状吻合的层间破碎带或层间断裂裂隙带控制的外接触带型铀矿化,是该区及其它花岗岩外带地区今后找矿的主要目标和找矿方向。     

五台山绿岩带条带状铁建造金矿床成矿地质特征与找矿标志

通过综合研究五台山条带状铁建造金矿床区域成矿地质背景及矿床(体)地质特征,应用层控说、构造控矿等成矿理论,总结了该类金矿主要控矿因素,认为后期构造叠加是富集成矿的首要的、关键性控矿因素,构造叠加改造的矿源层是最有利的成矿部位和最佳找矿地区。并归纳了找矿标志,意在推动本区金矿找矿突破,运用地、物、化等综合方法找矿效果较好。     

江西蒙山地区硅灰石矿床地质特征及成因探讨

蒙山地区位于江西西部,是我国南方较大的硅灰石矿产资源基地,已探明的硅灰石资源储量约占全国的1/5。区内硅灰石矿体赋存于燕山早期侵入形成的蒙山花岗岩体的外接触带300m范围的下二叠统茅口组含燧石结核、燧石条带灰岩中;矿体多呈似层状、透镜状产出,走向长100~400m,厚度2~20m;矿石中主要矿物为硅灰石、石英、方解石,硅灰石含量一般为55%~70%,矿石化学成分主要为SiO2和CaO。区内燧石灰岩提供了硅灰石形成的硅钙质组合、中深成岩浆岩为钙硅化学合成硅灰石提供了反应热液是两个主要的控矿因素,矿床属层控热变质交代型矿床。     

浅析五台山一带沉积变质型铁矿地质特征及勘查方向

本文通过分析和总结五台山区沉积变质型鞍山式铁矿地质特征,指出该类型矿床形态、厚度、品位、粒度与区域变质程度及多期次、多级别构造变形程度密切相关,区域性含矿岩系的整体变质程度是形成铁矿层的重要前提,构造活动是控矿重要因素,进一步阐述了该区矿床时空分布特征及后续勘查找矿方向。     

广西大瑶山及其西侧铅锌成矿区地质特征及找矿方向

大瑶山及其西侧铅锌成矿带是广西境内主要的铅锌产地,区内的铅锌矿床按其成因主要划分为沉积-热卤水改造型和接触交代(夕卡岩)两类,产出铅锌矿床较多.文章通过对研究区内铅锌矿床的含矿建造和构造控矿因素分析,详述了研究区内铅锌矿床在控矿层位、控矿岩性、控矿岩相以及断裂构造控矿和褶皱构造控矿的特点,进而为研究区内下一步找矿指出方向,并总结出该区的找矿标志.     

腾冲白石岩硅灰石矿床地质特征及成因探讨

本文系统地介绍了白石财硅灰石矿床地质特征。从矿床形成的物质来源的，硅灰石形成的物理化学条件，提出该矿床属层控热接触变质矿床。     

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.     

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″.     

Global repeating events in the history of the Earth and the motion of the Sun in the Galaxy

Chronological analyses of correlations between certain global repeating events (mass extinctions of marine organisms, meteorite impacts, and flashes in the frequency of geomagnetic reversals) during the Phanerozoic Eon and the motion of the solar system in the Galaxy are presented for five rotationally symmetrical models for the regular Galactic gravitational field. Thirteen of sixteen mass-extinction events can be described by a repetition interval of 183±3 million years. This is in agreement with the anomalistic period (interval between two subsequent passages of the Sun through the apocenter of its Galactic orbit) in the model of Allen and Martos. The positions of the minima and maxima in Gaussian functions approximating the frequency distribution for geomagnetic reversals also agree with the times of passage of the Sun through the apocenter and pericenter, respectively, of its Galactic orbit in this model. The maximum in the distribution of the deviations of the dates of mass extinctions from the nearest dates of impacts of large, crater-forming bodies is close to zero, providing evidence that many such events are correlated. As a rule, extinctions follow impact events. The impacts of large bodies have occurred most often when the solar system passes through the Galactic plane, while mass extinctions occur more often at some distance from the Galactic plane (about 40 pc). As a rule, intervals of increases in the frequency of geomagnetic reversals coincide with dates of impacts of large bodies. At the same time, these intervals do not show a clear correlation with the dates of mass extinctions. The intensity of mass extinctions, like the energy released by impacts, is consistently higher in periods when the Sun is moving from the apocenter toward the pericenter of its orbit, than when it is moving from the pericenter toward the apocenter. Thus, there is evidence for a variety of relationships between repeating global events in the Phanerozoic and the motion of the Sun in the Galaxy. Long-period variations in the frequency of geomagnetic reversals are correlated with the orbital motion of the Sun, and increases in the frequency of geomagnetic reversals are correlated with impacts. Mass extinctions are correlated with the impacts of large bodies, whose motions may have been perturbed by clouds of interstellar material concentrated toward the Galactic plane and by the shock front associated with the Perseus spiral arm, through which the solar system passes. The velocity of the Sun relative to the spiral pattern is estimated.     

从榴辉岩与围岩的关系论苏鲁榴辉岩的形成与折返

位于华北和扬子两板块碰撞带中的苏鲁榴辉岩形成的温压条件不但是超高压，而且是高温。榴辉岩的PTt轨迹表明其为陆-陆磁撞俯冲带的产物。榴辉岩的区域性围岩花岗质片麻岩为新元古代同碰撞期花岗岩，榴辉岩及其他直接围岩皆呈包体存在于其中，并见新元古代花岗岩呈脉状侵入榴辉岩包体中。区域性围岩新元古代花岗岩的锆石中发现有柯石英、绿辉石等包裹体，表明新元古代花岗岩的组成物质也经受过超高压变质作用，且榴辉岩与围岩新元古代花岗岩的锆石U-Pb体系同位素年龄基本相同。但新元古代花岗岩所记录的变质作用和变形作用期次（或阶段）却少于榴辉岩。椐上述可得如下推断：超高压榴辉岩与新元古代花岗岩岩浆是同时在碰撞带底部（俯冲板块前部）形成的；榴辉岩的第一折返阶段是由新元古代花岗岩岩浆携带上升的，其第二折返阶段是和新元古代花岗岩一起由逆冲及区域性隆起而上升，遭受剥蚀。     

某高速公路下伏煤矿采空区稳定性分析

在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。      

摩擦桩基桩土间极限摩阻力取值问题探讨

通过对广珠东线高速公路横沥大桥的试桩及土体的工程地质条件分析,总结出影响摩擦桩基桩土间极限摩阻力取值的一般问题以及解决问题的方法和措施。     

The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads

In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning.     

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.