某砂岩型铀矿床原地浸出采矿的地质及水文地质条件可行性探讨     

郭三民 《铀矿地质》1991,7(5):279-284,306

本文引用大量实际资料同国内外同类型铀矿床采用原地浸出采矿的各种条件进行了对比研究,得出了内蒙古某砂岩型铀矿床基本具备原地浸出采矿的地质和水文地质条件的结论,并提出了今后工作设想和建议。  相似文献   

High resolution radio refractive index studies in India using airborne microwave refractometers     

S. B. S. S. Sarma 《Journal of Earth System Science》1991,100(2):145-154

We discuss high resolution measurements on radio refractive index, in the boundary layer and above the atmosphere in the Indian sub-continent spread over a period of more than a solar cycle by making use of airborne microwave refractometers, operating around 9 GHz. Some atmospheric turbulence parameters comparable with earlier results have also been derived. The results demonstrate sharp gradients of radio refractive index, layer structures and the variability of the boundary layer in time and space. An erratum to this article is available at .  相似文献   

Some Problems Concerning Geologic Structure with Double Layers in Urban Underground Lifeline Engineering     

Peng Yimin Sun Jinzhong China University of Geosciences  Beijing 《中国地质大学学报(英文版)》1991,(1)

Underground lifeline engineering(ULE for short)in modern city demands the ap-preciation of an active fault in buried bedrock.Generally speaking,a large numberof urban geological textures of a basement may all be simplified into a dual geologicaltexture model,i.e.,the upper part of the basement consists of loose covering layerand the lower part consists of bedrock.The study of an active fault should includethree parts of contents,i.e.,to determine the lower time limit of activity of thefault,and the time limit must be recognized by both of designing engineers and geolo-gists;on the basis of the studies of repetition periods of earthquake occurrence to deter-mine whether the fault moves or not during the allowed time of efficacy of buildingsand constructions;for the sake of engineering practice,the active rate of the faultmust be given.The fault with different active mechanism has different effects on theULE.The authors studied the effect of lateral non-uniform overburden site on theULE by means of the su  相似文献   

金矿床地质地球化学研究新进展   总被引：1，自引：0，他引：1  

汪东波 《矿产与地质》1991,(2)

从4个方面系统地介绍了80年代以耒国际金矿床地质地球化学研究新进展.新的金矿床类型的发现和提出.丰富了金矿找矿内容.拓宽了金矿勘探的前景:建立了一系列的金矿床的矿化模式;对控制金矿化产生的主要因素.(矿源层、构造、热源)的地位及所起的作用,有了新的认识,金的成矿作用地球化学和成因研究获得突破性进展.  相似文献   

岩石变形中的压溶作用及相伴的构造分异作用   总被引：2，自引：0，他引：2  

周翊 《大地构造与成矿学》1991,15(2):144-151

压溶作用是低级变质环境中最常见的一种岩石变形作用机制。本文讨论了这种构造化学作用的渲化发展以及相伴的构造分异作用。探讨了诸如岩石的初始各向异性、应力状态、矿物的溶解度、流体的性质,以及物质扩散迁移的迁移系数、迁移通道等因素,对溶解作用带和沉淀作用带的生成与发展的影响,以及它们对在递进变形过程中由于分异作用形成的构造分异层的发展和几何特征的影响。  相似文献   

山区地面风模拟的参数化试验     

李国杰 《高原气象》1992,11(2):197-202

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Huaikuan Xia  Zaoxun Lu  Xue Niu  Delu Jiang 《地震学报(英文版)》1992,5(4):769-777

This paper describes synthetically the seismic activity, deep and shallow structures and rock dynamic features in and near Chaoyang—Yixian region. It is supposed that there is a low velocity layer in middle crust and the three-layered crustal velocities are all lower than that in both sides of the region. There exists uplifts of upper mantle and asthenosphere-low resistance layer. It is also studied the composition of matter of three-layered crust, low velocity layer, upper mantle and asthenosphere. In the end the direct relations between the deep and shallow structure, composition and the seismic activity and new activities of faults in this region are discussed. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 180–186, 1992.  相似文献   

Experimental study on the effect of the critical temperature of water on the preparing and occurring of large earthquakes     

Dailu Rong  Fahui Jin  Yuting He  Ming Jin  Xuyuan Jiang  Zhongqiang Gao 《地震学报(英文版)》1992,5(4):739-747

The features of fracturing and dissolving of Yunnan marble in distilled water near the critical temperature have been studied experimentally. The results indicate that the mechanical parameters of the samples (fracture strength, Young’s Modulus, shear fracture energy and fracture toughness) drop with the temperature of the environment water, near the critical temperature (380°C), these parameters have sudden changes (drop), then keep stable values roughly. The contents of some chemical materials in the water, PH value and conductivity at every experiment temperature have been analysed and measured. At 380°C, there all exist sudden changes. According to the results, it is pointed out that the sudden changes are related to strong stress corrosion of water near its critical temperature to the rock and the exist and its migration of the water solution near the critical temperature in the crust have important significance to the earthquake source process, the formation cause of the low-focal depth earthquakes in the crust. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 156–163, 1992. This work was sponsored by the Chinese Joint Seismological Science Foundation.  相似文献   

阿尔金山斜坡的深部电性结构及推覆构造          下载免费PDF全文

王信和  唐明光 《地质科学》1992,(4):317-324

在柴达木盆地西部边缘的阿尔金山斜坡带上进行了16个测点的大地电磁测深工作。反演结果表明,测区的电性结掏具有明显的南北分区特征。南部表现为低阻特征,与盆地内部相似;北部具有明显的高阻特征。根据电性与地层的追溯对比,结合钻孔与地质资料推测,在柴达木盆地西部的阿尔金山斜坡带上存在由北向南的推覆构造,下古生界和元古界地层推覆在中、新生代地层之上。推覆体宽度和推覆距离均超过10km。  相似文献   

壳内低速层与地震活动关系   总被引：11，自引：0，他引：11  

姜本鸿  袁登维 《地质科技情报》1992,11(4):9-15

本文根据华北、扬子地台、青藏高原等地区的速度结构、介质特征、地震活动分布等特征,认为地壳中的低速层是在地壳中的弱化层,它与壳内低阻或高导层相对应,在地质构造上反映中地壳大型层间韧性剪切带,与地震活动的层状分布深度范围相对应,粘滑机制是壳内地震活动非常重要的机制,反映了岩石变形呈脆韧性过渡状态。  相似文献