泰和盆地构造和演化初探     

王迪文  龙天 《江西地质科技》1997,24(4):165-169

我国大部分地区的小新生代盆地的成生、演化受断裂构造的控制,泰和盆地即是严格受断裂构造控制的走滑拉张型盆地。本文着重从盆地的基底构造、盆缘断裂构造及盆地同生、后期构造阐述了它们与盆地形成和演化的关系。  相似文献   

512铀矿床地浸条件及技术经济评价   总被引：2，自引：2，他引：2  

王保群 《铀矿地质》1997,13(3):147-153

本文应用铀矿普查及地浸试验中获取的资料，对５１２矿床地质构造、矿石物质成份、矿床水文地质、工程地质及自然经济地理等地浸条件及矿床技术经济条件进行了分析评价，认为５１２矿床地浸条件较好，地浸技术指标适中，用酸法地浸开采具有耗酸量少、成本低、经济效益好的特点。在今后的开采中，若能解决伴生元素Ｒｅ，Ｓｅ，Ｍｏ的综合利用问题，将会大大提高矿床的经济价值。  相似文献   

华北克拉通-扬子克拉通与秦岭造山带古地幔组成及状态的对比   总被引：4，自引：1，他引：4  

路凤香  郑建平  王方正  孙平  刘永顺  赵磊 《地球科学》1997,6(3)

经研究，华北克拉通古地幔以含石榴石的二辉橄榄岩、方辉橄榄岩及纯橄榄岩为主．地幔交代作用强烈，岩石富集不相容元素，明显高于南非及西澳克拉通者．扬子克拉通古地幔主元素亏损程度差，交代作用较弱，岩石为石榴石／尖晶石二辉橄榄岩．秦岭造山带壳、幔交界带的岩石类型复杂，包括蛇纹石化尖晶石二辉橄榄岩（蛇纹岩）、石榴石辉石岩、榴闪岩、变辉长岩及变玄武岩等．蛇纹岩遭受强的塑性流变，剪切变形结构发育．与克拉通相比，地幔交代作用很弱．３个地幔域的古地温状态有差异，秦岭造山带最高，扬子克拉通居中，华北克拉通最低．上述结果表明，两克拉通的古地幔特征相差显著，暗示经历了不同的演化过程．交代作用可能发生在１７００Ｍａ以前和１１００～５００Ｍａ，后者强于前者．造山带地幔的剪切变形明显强于克拉通地幔  相似文献   

A new form of the cokriging equations     

Andrew E. Long  Donald E. Myers 《Mathematical Geology》1997,29(5):685-703

Myers developed a matrix form of the cokriging equations, but one that entails the solution of a large system of linear equations. Large systems are troublesome because of memory requirements and a general increase in the matrix condition number. We transform Myers’s system into a set of smaller systems, whose solution gives the classical kriging results, and provides simultaneously a nested set of lower dimensional cokriging results. In the course of developing the new formulation we make an interesting link to the Cauchy-Schwarz condition for the invertibility of a system, and another to a simple situation of coregionalization. In addition, we proceed from these new equations to a linear approximation to the cokriging results in the event that the crossvariograms are small, allowing one to take advantage of a recent results of Xie and others which proceeds by diagonalizing the variogram matrix function over the lag classes.  相似文献   

Relocation of the October 9, 1505 Earthquake with M63/4     

Dong Ruishu  Xiang Hongfa  Guo Shunmin  Ran Hongliu  and Fu ChanghongInstitute of Geology  SSB  Beijing  China Institute of Geophysics  SSB  Beijing  China 《中国地震研究》1997,(4)

There have been 12 possible locations of the earthquakes occurring in the South Yellow Sea since 1505.In this paper,the location of the earthquake that occurred in 1505 has been determined by the collection of more historical data of the influenced field,referring the isoseismal data of earthquakes with the epicentral intensityⅨ and combining geophysical field data with tectonic condition,due to its great influence on seismic safety assessment of some significant engineering.  相似文献   

Study of the liquefaction resistance of a saturated sand reinforced with Geosynthetics   总被引：1，自引：0，他引：1  

D. Vercueil  P. Billet  D. Cordary 《Soil Dynamics and Earthquake Engineering》1997,16(7-8):417-425

This article presents various tests using a cyclic triaxial instrument, on samples of saturated Hostun RF sand, reinforced with circular sheets of geosynthetic material. Tests performed with different types of geosynthetics of different compressibility, rigidity and roughness characteristics indicate a significant increase in liquefaction resistance for samples reinforced with compressible, non-woven geotextiles. The undrained behaviour of saturated Hostun RF sand reinforced with non-woven geotextiles is analysed on the basis of different test series. This analysis highlights the influence of reinforcement compressibility on interstitial pressure distribution in the sample, thus showing the role of this type of inclusion in the increase in liquefaction resistance.  相似文献   

Study on simulation of spatial correlative earthquake ground motion field     

Xiao-Jun Li  Feng-Xin Zhao  Yu-Xian Hu 《地震学报(英文版)》1997,10(2):267-271

  相似文献   

流体在同心环状空间中流动时的压力损失     

张祝新  程晓新  夏圣强 《吉林大学学报(地球科学版)》1997,(2)

同心环状空间是工程上较常见到的流体流动空间，在此空间中流体流动情况的分析较复杂。工程上对其流动情况的分析常常是引用流体力学中的分析结果，但往往由于对环状空间结构的条件重视不够，引用时很容易出毛病。经过仔细推导分析，指出其应用条件，并有助于对同心环状空间中流体流动时压力损失的分析与计算  相似文献   

北祁连加里东造山带从挤压到伸展造山机制的转换   总被引：1，自引：0，他引：1  

张建新  许志琴  李海兵  徐惠芬 《吉林大学学报(地球科学版)》1997,(3)

早古生代早期，北祁连造山带发生强烈的挤压变形作用，形成加里东期的俯冲－增生杂岩、高压变质岩，并使造山带岩石圈地壳加厚缩短。志留纪末期，加厚的造山带岩石圈由于垮塌作用及根部的拆沉作用，使造山带从挤压造山机制转换为伸展造山机制，并进入后造山伸展作用阶段，增厚的岩石圈开始减薄，发生不同层次的伸展作用，同时伴随花岗岩及Ａｎ∈变质岩的穹隆以及泥盆纪磨拉石盆地上叠盆地（Ｃ－Ｔ）的形成。石炭纪末，北祁连造山带岩石圈地壳已基本减薄到正常厚度。而现今的北祁连造山带的缩短和抬升则为喜马拉雅期再造山作用的产物  相似文献   

Tectonic Evolution of the Himalayan Collision Belt   总被引：5，自引：0，他引：5  

Cui Junwen Institute of Geology  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》1997,71(2):133-143

This paper discusses the tectonic divisions of the Himalayan collision belt anddeals with the tectonic evolution of the collision belt in the context of crustal accretion in thefront of the collision belt, deep diapirism and thermal-uplift extension and deep material flow-ing of the lithosphere-backflowing. Finally it proposes a model of the tectonic evolution-progressive intracontinental deformation model-of the Himalayan belt.  相似文献