超导岩石磁力仪参数的选择     

陈文升 《吉林大学学报(地球科学版)》1988,(1)

本文讨论了用于古地磁测量的超导岩石磁力仪的若干参数,如样品杜瓦管直径、探测线圈匝数、超导屏蔽筒直径等的选择,并计算了超导岩石磁力仪的理论灵敏度。  相似文献   

论宁夏金场子渗流热卤水-表生改造型金矿床的矿源     

徐国风 《地球科学》1988,(2)

稳定同位素、岩石微量元素(金)和地质特征研究的结果,表明金场子金矿床的成矿物质来源系上地壳源,并且金、银、铅、铜等金属和硫、硒、砷、氯、氟、碳等来源于石炭纪和泥盆纪沉积岩。成矿流体是大气水和沉积地层水的混合溶液。金矿化与地热流体渗流热卤水成矿作用和表生风化成矿作用有关。  相似文献   

Development of the ultrasonic measurement technique and its application in the observation of rock mass stability     

Yonglian Sun  Shiliang Lu  Chuliang Zhou 《Geotechnical and Geological Engineering》1993,11(4):273-284

Summary A method of measuring ultrasonic wave properties in rocks during the complete stress-strain process is described. The relevant experimental laboratory study, to reveal the change of the amplitude spectrum parameters with strain (or stress) has been carried out. A preliminary study was conducted on the application of the ultrasonic measurement technique at a belt conveyor roadway of the north wing in Baodian coal mine, Shandong province. A borehole ultrasonic device with dry coupling was developed to provide better coupling and more accurate measurement data in comparison with those of a water coupled situation. Based on the interrelations between the complete stress-strain properties of specimens and their wave properties, the structural properties of surrounding rocks, the range of yield zones, and the change of stresses within the rocks surrounding a roadway which was subjected to mining influence of upper longwall face were analysed. Amplitude spectrum parameters were used to give a better prediction of the physico-mechanical state of the surrounding rocks.  相似文献   

Shear resistance of jointed rock masses and stability calculation of rock slopes     

Xing Zhang 《Geotechnical and Geological Engineering》1993,11(2):107-124

Summary Based on an extension to a model originally proposed by Zhang (1990), a method for estimating the shear strength of a jointed rock mass containing two joint sets is developed. Compared to the original method in which only a single en-echelon joint set was considered, the new method has the following advantages: (1) it allows a much more realistic joint pattern to be incorporated; (2) the effects of joint connectivity and intersection angle between joint sets on shear strength are included. Use of the new method is demonstrated by application to the calculation of the stability of slopes in jointed rock. The importance of joint connectivity, joint persistence and joint set intersection angle on slope stability, as predicted by the model, is revealed.  相似文献   

Organic matter of the Mulhouse Basin, France: a synthesis     

P. Hofmann  A.Y. Huc  B. Carpentier  P. Schaeffer  P. Albrecht  B. Kelly  J.R. Maxwell  J.S.Sinninghe Damst  J.W. de Leeuw  D. Leythaeuser 《Organic Geochemistry》1993,20(8)

The lower Oligocene evaporite sequence of the Mulhouse Basin (France) contains organic matter-rich marl deposits. These marls display an overall cyclic variation of sedimentation rate, organic carbon content, hydrogen index and selected molecular parameters over a 30 m thick stratigraphic interval. The integration of all sedimentological and geochemical parameters has allowed the reconstruction and characterization of the paleoenvironment of deposition. The marls were deposited in a perennial lake that was at times connected to the sea. Two organic facies end members could be assigned to a lake stage with a marine connection and a lake stage that received dominantly continental water input. The overall stratigraphic variation in the organic matter content is interpreted to reflect the adaptation of the Oligocene flora to the changing paleoclimate and environmental conditions.  相似文献   

米仓山碱性岩中的主要矿物研究及其成因信息   总被引：3，自引：0，他引：3       下载免费PDF全文

许继峰 《岩石矿物学杂志》1993,12(3):269-278

米仓山碱性岩中的主要矿物为富铝的(次硅)铝铁质透辉石、钙质角闪石、霞石等,且大量出现霞石,但无或极少有碱性暗色矿物。研究表明:氧逸度低是碱性岩浆不能结晶出碱性暗色矿物的原因。本区这种无碱性暗色矿物的碱性岩是在封闭体系及深成条件下结晶的,而其它地区含有碱性暗色矿物的岩石则是在开放体系中形成的。  相似文献   

中国主要含镍岩体特征及其成因   总被引：8，自引：0，他引：8       下载免费PDF全文

骆华宝  乔德武 《岩石矿物学杂志》1993,12(4):312-324

中国目前已发现7条岩带中18个岩体赋存有工业铜镍矿床。这些含镍岩体的岩石组合有三大类,其中以超基性岩中矿床居多,苏长岩与科马提岩中较少。中国含镍岩浆系列属于科马提岩系列而非拉斑玄武岩系列,含矿岩浆来自上地幔的部分熔融,源区具有U、Th值高而Cr低的特点,深大断裂发育的大陆边缘是镍矿床发育最理想的场所。  相似文献   

云南安宁地区晚侏罗世含盐岩系的主要特点及沉积环境   总被引：2，自引：0，他引：2  

陈瑞君  朱井泉 《岩石学报》1993,9(1):94-104,T001

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华南基底变质岩的Sm-Nd同位素及其对花岗岩类物质来源的制约   总被引：33，自引：17，他引：33  

沈渭洲  朱金初  刘昌实  徐士进  凌洪飞 《岩石学报》1993,9(2):115-124

华南地区存在两种类型变质基底。Sm-Nd同位素数据的研究结果表明,它们可分别代表华南两种类型元古代地壳端员。华夏地块区副变质岩代表成熟度较高的(早)元古代地壳端员,~(147)Sm/~(144)Nd=0.1198,~(143)Nd/~(144)Nd=0.511822;江南古岛弧区副变质岩代表成熟度较低的(中—晚)元古代地壳端员,~(147)Sm/~(144)Nd=0.1246,~(143)Nd/~(144)Nd=0.512170。根据上述数据得出了华南元古代地壳Sm-Nd同位素演化域,进而对华南不同时代花岗岩类的物质来源作了进一步的讨论。  相似文献   

柴达木盆地岩石热导率的饱水试验研究及热流校正     

杨淑贞  张文仁 《岩石学报》1993,9(2):199-204

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