JUNCTION BETWEEN GANJIANG FAULT AND TANLU FAULT AND ITS SIGNIFICANCE TO MINERALIZATION

The concept of fault junction is proposed to describe the relationship between the two faults by the authors. The junction relationship between Ganjiang and Tanlu faults is analyzed in this paper, and this has been elucidated through numerical simulation about the tectonic stress field analysis. Numerical simulation of the tectonic stress field conducted for the major mineralization stage of the Jiujiang-Ruichang junction area reveals that the stress Feld of the junction structure at the major mineralization stage shows a relatively close relationship with the formation of the ore deposits (occurrences).     

地理学人地关系与人地系统研究现状评述

地理学的研究核心是人地关系和人地系统。人地关系和人地系统的理论研究是区域可持续发展实践应用的基础。文章从人地关系与人地系统的基本内涵认知为切入点，综合分析了国内外人地关系与人地系统理论与应用研究的现状，指出了当前研究中存在的不足，并提出了粗浅的研究框架和蓝图。     

城市地图数据库面实体匹配技术

同一地区不同来源地图数据库同名面实体的识别或匹配对空间数据库的集成与信息共享非常有意义。该文研究了城市地图数据库同名面实体匹配的有关问题 ,提出了基于模糊拓扑关系分类的面实体匹配方法 ,该方法充分考虑了源地图数据库的不确定性 ,能处理非一对一的匹配情况。匹配结果不仅可以作为城市地图数据库集成和信息共享的依据 ,还可以用来分析两个地图数据库之间的差异 ,进行变化检测与自动更新     

基于GIS空间实体的自动拓扑模型设计与实现

介绍了以拓扑关系数据为基础的GIS空间点、线、面对象实体模型,给出了基于对象实体模型的自动拓扑关系模型。阐述从自动剪断线、线转弧段、微弧段剔除到自动成区等自动拓扑算法的流程,并给出了相应的应用实例。     

碧口群的层序及时代

碧口群是一套发生在台地与裂谷之间的裂谷边缘型沉积，各类岩石之间具有规律性的相变特征，按岩石类型及组合特征可划分为７个组级岩石地层单位。根据该群不整合在志留纪茂县群或水晶组之上，被中泥盆统—石炭系略阳组连续沉积覆盖，以及自身所产化石（Ａｍｐｈｉｓｉｔｅｓｐｕｌｃｈｅｒ，Ｂａｉｒｄｉａｓｐ．，Ｄｅｓｑｕａｍａｔｉａｓｐ．，Ｓｃｈｉｚｏｐｈｏｒｉａｓｐ．等），将其时代确定为早—中泥盆世。     

Trace Element Abundance Relationships in the Multi—stage Comagmatic Fractional Crystallization and Their Applications

In this study a mathematical expression of trace element abundance relationship for the mul-ti-stage comagmatic fractional crystallization has been established ,based on geochemical studies of the Emeishan basalt-trachyte series and adjacent mafic-ultramafic layered intrusions, as well as on the avail-able data for basalt, andesite, dacite and rhyolite series in southern Andes,Chile ,which have been well documented.It is demonstrated that the abundance constant (R) for a given trace element at dif-ferent stages of fractional crystallization of a parental magma is highly variable,which can be used as a criterion to divide fractional crystallization stages.     

《周易》思维与现代大地构造学关系的初探

当代大地构造学已经认识到板块、地体、板片、推覆体,都是组成地球的物质通过漂、撞、隆、降、伸、缩、滑、旋等八种不同的运动形式所显示的活动特征。并铸成了地壳表面四类二级规模的构造地文单元:山地、谷地、台地、盆地。它们又分别都表现在地球上两类一级规模的构造地文单元—大陆和海洋之中。因此,大地构造学研究的地球,洋陆,“山谷台盆”,“漂撞隆降伸缩滑旋”可从《周易》的思维模式:“易有太极、是生两仪、两仪生四象、四象生八卦”受到更深的启迪,帮助地学家建立系统论、控制论和全息论的新的地球观。     

漫谈重砂矿物的鉴定问题及实例

笔者根据多年的实践经验,深感到利用矿物组合关系和矿物中元素组合关系从事矿物鉴定,是保证重砂鉴定质量,提高工作效率的有效途径。     

Measuring wave propagation characteristics in artificial sand-clay mixtures

Ultrasonic compressional (V _p ) and shear (V _s ) velocities have been measured on artificial sand-clay mixtures. The measurements were carried out in a drained triaxial load cell using a pulse transition method. The measuring device was equiped with a waveform storage facility. The investigated mixtures consisted mainly of kaolinite and quartz sand. Some mixtures also contained Na-montmorillonite, illites or quartz-flour. The acoustic behaviour was observed during a pressure increase up to 72 MPa vertical and 36 MPa horizontal pressure. At a given pressure,V _p andV _s in pure sand turned out to be similar to those in pure kaolinite. As predicted by the sand-clay model of Marion (1990), a velocity maximum corresponds to a minimum in total porosity. This porosity minimum marks the transition from a clayey sand to a sandy clay. It is not only reflected in bothV _p andV _s , but also in the quality of the received pulse. The effective tension of the received signal during 20µs after the first arrival, was used as an indication for P-wave pulse attenuation. This apparent attenuation decreases with increasing clay content and increases with increasing porosity. It is shown that clay mineralogy does not measurably affect wave velocities in clayey sands.     

On the Eulerian source-receptor relationship

A new approach is proposed to delineate the source-receptor relationship in an Eulerian model. A small, unique oscillatory signal is superimposed on each emission source in the airshed. At receptor sites the concentration time series are analyzed by a Fourier transform to give the amplitudefrequency spectrum. Distinct peaks found in the spectrum are identified at the emission frequencies. The amplitude of the spectrum at the source frequency represents the individual contribution from that emitter. Various atmospheric transport and diffusion models are solved to show the effects of different physical and chemical processes on the oscillatory signals. Both analytical and numerical solutions are used to demonstrate the performance of the method.The National Center for Atmospheric Research is sponsored by the National Science Foundation.