华北地台北缘火山岩型铀钼矿床找矿模型研究

460铀钼矿床具有很好的火山岩型铀钼矿找矿前景。460铀钼矿早期为斑岩型矿化,晚期叠加火山热液型矿化,成矿时代为晚白垩世及新近纪。铀源层(体)为张家口组三段酸性火山岩及次流纹斑岩,由壳源重熔岩浆作用形成。以460矿床区域地质背景、成矿环境、矿床地质特征及找矿标志研究为重点,总结归纳了火山岩型铀钼找矿方法,建立了华北地台北缘火山岩型铀钼矿床的找矿模型。     

沽源火山盆地铀钼多金属成矿地质条件分析及找矿方向

沽源火山盆地是我国北方重要的铀钼多金属矿勘查基地和矿业开发基地。文章在总结矿床地质特征的基础上,重点分析了多金属矿成矿地质条件、矿化特征和成矿时代以及成矿作用与中生代次火山岩和断裂构造关系。认为在盆地基底变质岩中寻找岩浆热液叠加改造型的层控铅锌银金矿床、在盆地火山岩盖层中寻找火山岩热液型铀钼矿床具有良好的找矿前景。     

内蒙古介拉斯台盆地铀成矿条件分析与找矿预测

介拉斯台盆地处于扎兰屯火山岩型铀成矿远景带中段，是国内中生代火山岩最为发育地区之一，多期次断裂、火山活动强烈发育，铀成矿地质背景优越。文章通过对介拉斯台中生代火山岩盆地的大地构造背景、基底和盖层的含铀性、潜火山岩、断裂、火山机构、热液蚀变、铀矿化等铀成矿地质条件研究，并结合航放、化探及遥感找矿信息进行综合分析，认为介拉斯台中生代火山岩盆地具有较好的铀成矿潜力，圈定成矿远景区5处。     

河北张麻井矿床的矿物学研究及其对铀钼成因关系的启示

张麻井铀钼矿床是中国北方地区最大的火山岩型铀钼矿床.为探讨该矿床的铀钼成因关系,对浸染状钼(铀)矿石开展了矿物学和元素地球化学研究.除沥青铀矿外,铀石也是该矿床的一种重要铀矿物,常呈他形粒状,与胶硫钼矿、闪锌矿共生.元素面扫描结果显示,铀与钼元素的空间分布范围非常一致,表明铀和钼可能为同一期成矿作用的产物.此外,相较于...     

河北沽源460铀钼矿床成因探讨

460铀钼矿是一大型铀钼共生矿床,矿床定位于多组断裂构造与火山机构的复合部位,铀钼矿体赋存于火山通道相次火山岩体和隐爆角砾岩中,以浸染状、网脉状矿化形式为主,围岩为酸性火山岩,矿物组合与蚀变有分带特点,并有高、低温矿物共存现象。火山岩、次火山岩中有较高的铀钍丰度。硫同位素表明成矿物质来源于基底岩石和火山岩围岩;氢氧同位素表明成矿热液主要为大气降水经深部加热形成。矿床类型为与次火山岩有关的热液矿床。     

新疆雪米斯坦火山岩带南翼铀多金属成矿控制因素分析

雪米斯坦火山岩带南翼铀多金属矿化主要赋存于陆相次火山岩、中酸性火山岩中,受控于大型断裂锐角夹持区.在研究与铀多金属成矿相关的岩性岩相、构造蚀变及矿化特征基础上,认为铀多金属矿化分带明显.西段主要寻找受次火山岩接触带控制的铀铍钼矿,中段主要寻找受次级裂隙带控制的铀铜矿,东段主要寻找受塌陷式火山机构控制的铀钼矿.     

赣东北新安地区铀矿控矿因素及找矿方向

新安地区是赣杭火山岩带鹅公山火山盆地重要的铀成矿区。文章通过对新安矿床及外围铀成矿特征、控矿因素及成矿潜力研究,认为该区赋矿围岩早白垩世打鼓顶组和鹅湖岭组为富铀层,岩浆期后热液演化促成铀成矿作用;NWW、NNE、NE向3组断裂构造为铀矿控矿构造,F_1断裂凹凸变化部位为铀成矿有利空间;F_1倾向延伸及下盘砂岩破碎带具有较好成矿潜力,指出已知矿床及外围找矿方向,拓展了找矿空间。     

内蒙古小东沟钼矿外围找矿前景分析

通过对小东沟钼矿的勘查和研究,类比外围物探异常和矿化特征,探讨了该地区钼矿和铅锌矿的成矿地质条件,提出小东沟钼矿外围综合利用物探成果进行找矿的思路及找矿前景。研究认为,该地区有望成为大型钼多金属矿床。     

内蒙古东沟营盆地铀成矿多源信息分析与远景预测

内蒙古东沟营盆地位于扎兰屯铀成矿远景带北段,铀成矿地质条件优越.受林区覆盖厚、交通不便等因素制约,铀矿地质调查工作程度低,找矿进展缓慢.在区域铀成矿地质背景分析的基础上,通过对典型铀矿点控矿因素进行剖析,结合航空放射性、地球化学、遥感多源铀成矿信息,构建了火山岩型铀矿综合找矿模型.类比邻区典型火山岩型铀矿床,开展找矿远景分析,认为研究区具备较好的找矿前景.依据找矿模型,结合地质、物化遥综合找矿信息,圈定铀成矿有利区段4处.其中新圈定成矿有利区段3处,其成矿地质条件优越,找矿线索丰富,找矿前景较好.     

金场沟铜钼、金矿成(控)矿条件分析与成矿规律

通过对矿区地层条件、构造条件和次火山侵入岩条件调查研究,平行敦密断裂的金场沟断裂(带)控制着次火山侵入岩和其中的角砾岩筒构造的分布,而角砾岩筒构造直接控制着铜钼矿的产出.其中铜钼矿化与花岗闪长斑岩有关,外围金银矿化与石英闪长岩有关.同时总结了成矿规律与进一步找矿方向.     

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.     

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.     

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″.     

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.