地电化学法寻找隐伏金矿的应用研究

通过对金的地电化学成晕机制的研究,利用地电化学法在东北大兴安岭森林覆盖区虎拉林金矿和澳大利亚第四纪厚层覆盖区Challenger金矿进行可行性找矿试验研究。试验结果在上述已知矿区的剖面上均测出了清晰的地电化学异常,表明利用地电化学法在上述地区寻找的隐伏金矿是有效的。在此基础上对两矿区外围及深部进行了找矿预测,发现4个有利的成矿靶区,经工程验证发现2个金矿体,取得了良好的经济和社会经济效益。     

地电化学集成技术在青藏高原特殊景观区的找矿效果及其异常与矿体产状的关系

利用地电化学集成技术在青藏高原干旱荒漠区和冻土覆盖区开展找矿试验研究,有针对地选择已知剖面进行方法有效性试验,证明了在已知剖面上方出现的地电化学异常与已知矿体吻合,说明在该类地区应用地电化学集成技术进行找矿预测是切实可行的.同时,初步建立了在青藏高原干旱荒漠区及冻土覆盖区寻找隐伏金属矿的地电化学异常形态与矿体产状之间的关系,为今后在同类特殊景观区的找矿工作提供参考.     

干旱高山区地电化学法寻找铜镍矿研究——以青海化隆拉水峡铜镍矿区为例

为解决干旱高山区的深部找矿问题和探索地电化学法在干旱高山区寻找隐伏铜镍矿产的可行性,在青海化隆拉水峡铜镍矿区开展了地电提取测量法、土壤离子电导率测量法寻找隐伏铜镍矿的试验研究,通过对已知矿体的地电化学法找矿试验,在隐伏铜镍矿体上测出了清晰的地电化学异常。对矿区的深部及外围的找矿预测中,在A区发现3个地电化学Ni、Cu及电导率异常,在B区发现3个地电化学Cu异常、1个Ni异常、3个电导率异常,在C区发现了3个地电化学Cu异常、2个地球化学Ni异常、3个电导率异常,推测在上述地电化学异常区内寻找隐伏铜镍矿会有新的突破。     

内蒙古额尔古纳市虎拉林金矿区地电化学提取法寻找隐伏金矿研究

地电化学提取法是在动态平衡原理的基础上,利用人工电场提取深部的矿化或成矿离子,进行成矿预测,确定成矿靶区.为探明资源、节省投入,在虎拉林金矿区投入了以地电化学提取为主的找矿方法,来找寻矿区隐伏的矿体.通过对地电化学提取异常和其他方法异常的综合分析,确定在金矿区具有一定的找矿潜力,并证明了地电化学提取和其他方法在森林覆盖区寻找深部隐伏金矿床是可行的.     

地电化学方法在盛源盆地南部铀矿找矿中的应用

在《江西省鹰潭市盛源盆地南部铀资源潜力评价》项目的实施过程中，开展了以地电化学提取法为主，以土壤电子电导率，土壤吸附相态汞测量为辅的多种找矿方法组合的应用。其目的是为在盛源盆地南部厚层状白垩系红层覆盖区寻找隐伏富大铀矿的靶区提供依据。本文论述了这种找矿新方法的原理。工作方法及其应用效果。以拓宽南方硬岩型富大铀矿找矿的思路。     

凹陷盆地铜镍多金属矿床地电化学异常特征及找矿预测

为了尽快突破盆地寻找隐伏矿难题,选取河南南阳盆地的周庵矿床开展以地电化学方法为主的找矿示范及预测研究.示范研究显示,在已知矿体上方集中测出了明显的地电提取Cu、Ni、Co等异常及土壤离子电导率异常.盆地隐伏矿的地电化学异常有两个特征:在隐伏矿体两侧的边缘地段,往往分布一定规模的地电提取元素异常,两侧异常的中间地段指示矿体的赋存范围;土壤离子电导率异常在矿体上方以负异常为主,在边缘地段则出现对称的峰值异常.本区土壤热释Hg异常在矿体上以高强度单峰异常为主,在剖面上多呈不连续跳跃分布.根据以上特征,初步建立了河南南阳盆地隐伏铜镍矿床地电化学理想找矿模型,并在已知矿体外围开展隐伏矿预测研究,圈定了有利找矿靶区3处.     

利用地电化学法寻找隐伏铅、锌、银多金属矿 ——以内蒙古阿巴嘎旗陶勒盖矿区为例

通过对内蒙古阿巴嘎旗哈达特陶勒盖矿区开展地电化学勘查寻找隐伏铅、锌、银多金属矿的研究,确定地电化学勘查在该地区有效。圈出Pb、Zn、Ag等多个异常区,综合各异常和以往的工作成果,确定在该地区具有一定的寻找隐伏铅、锌、银多金属矿的找矿潜力。共圈定出Ⅰ、Ⅱ、Ⅲ、Ⅳ四个综合异常区,并划分为A、B、C三类异常靶区,为该区的找矿预测指明了方向。     

利用地电化学法寻找隐伏铅、锌、银多金属矿——以内蒙古阿巴嘎旗陶勒盖矿区为例

通过对内蒙古阿巴嘎旗哈达特陶勒盖矿区开展地电化学勘查寻找隐伏铅、锌、银多金属矿的研究,确定地电化学勘查在该地区有效。圈出Pb、Zn、Ag等多个异常区．综合各异常和以往的工作成果,确定在该地区具有一定的寻找隐伏铅、锌、银多金属矿的找矿潜力。共圈定出I、Ⅱ、Ⅲ、IV四个综合异常区,并划分为A、B、c三类异常靶区,为该区的找矿预测指明了方向。     

云南西邑隐伏铅锌矿地电化学异常特征及找矿预测

为了在云南西邑铅锌矿区外围和深部寻找隐伏铅锌矿,在董家寨矿段开展了地电化学法找矿研究,对铅锌矿石进行了电化学溶解并在已知矿体上开展了地电化学法找矿可行性试验。结果表明:外加电场作用不仅会使铅锌矿发生电化学溶解,同时地电化学法也可将溶解出来的Pb、Zn等成矿离子提取;已知矿体上方同步出现了Pb、Zn、Ge、Ag异常,地电提取的异常值大小为PbZnGeAg,为典型的喷流热水沉积富锗银铅锌矿的地球化学标志;在此基础上,利用地电化学法在西邑董家寨未知区开展了找矿预测,共圈定了5个综合异常区,其中Ⅰ类异常区2个、Ⅱ类异常区2个、Ⅲ类异常区1个,为下一步勘查找矿工作奠定了基础。     

地电化学法在南澳大利亚寻找隐伏金矿的研究

地电化学法是一种借外加电场作用,将呈活动态的金属离子迁移到特制接收装置,收集并分析接收器上的电解物,可发现与矿有关的金属离子异常,从而达到找矿和评价目的的一种找矿方法。利用地电化学法在澳大利亚干燥近沙漠化钙质层覆盖区的Challenger金矿和Kalkaroo铜金矿进行可行性试验结果显示:在上述已知矿体的剖面上均测出了清晰的地电化学异常,而同时开展的土壤地球化学测量无异常显示。表明利用地电化学法在南澳大利亚干燥近沙漠化覆盖区寻找隐伏金属矿床是有效的。在此基础上,利用该方法在Challenger金矿区外围及深部进行了找矿预测,发现了3个有利的成矿靶区,并经工程验证发现1个金矿体,获得了相应的金储量,取得了良好的社会经济效益。     

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。     

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。     

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.