攀西层状基性-超基性岩体的韵律特征及分形研究     

钟玉芳  岑况  马芳 《地质科技情报》1999,18(1):33-38

攀西层状基性－－超基性岩体的韵律结构发育,岩体的岩石矿物特征、地球化学特征在垂向上均叶多级套叠的韵律式变化。通过对韵律结构全面、详细的研究,发现韵律结构具有分形特征;运用分形理论地大韵律层进行研究之后,认为层状岩 韵律结构的形成可能受５个实质性状态变量控制;进一步结合地质资料分析,推测达５个状态为量力：岩浆成分、压力、温度、氧逸度、重力。  相似文献   

Fractal and Multifractal Properties of the Spatial Distribution of Natural Fractures--Analyses and Applications   总被引：3，自引：0，他引：3  

XU Jiandong  QU Guosheng  Robert D. JACOBI 《《地质学报》英文版》1999,73(4)

The Cantor's dust theory is applied to investigate the scaling properites of the spatial distribution of natural fractures obtained from detailed scanline surveys of 27 field sites in the Appalachian Plateau of western New York, USA. The results obtained in this study indicate: 1) fracture spacing is characterized by fractal and multifractal properties. On small scales analyses yield an average fractal dimension of 0.15, which suggests a very high degree of clustering. In contrast, on large scales, fractures tend to be more regular and evenly distributed with an average fracture dimension of 0.52; 2) fractal dimension varies with different sets in different orientations, which can be attributed to interactions between pre-existing fractures and younger ones, as well as variations of the intensity of the stresses under which the fractures were formed; 3) a time sequence of fracture set formation can be proposed based on fractal and multifractal analyses, which consists of (from old to young): N-S, NW, ENE, and NE-striking sets. This time sequence is confirmed by the study of the abutting relationships of different fracture sets observed in the field.  相似文献   

Fractal and Multifractal Propertiesof the Spatial Distribution of Natural Fractures——Analyses and Applications     

XU Jiandong  QU Guosheng Institute of Geology  China Seismological Bureau  Beijing  PRCand Robert D. JACOBI Department of Geology  State University of New York at Buffalo  USA 《《地质学报》英文版》1999,73(4)

The Cantor's dust theory is applied to investigate the scaling properties of the spatial distribution of natural fractures obtained from detailed scanline surveys of 27 field sites in the Appalachian Plateau of western New York, USA. The results obtained in this study indicate: 1) fracture spacing is characterized by fractal and multifractal properties. On small scales analyses yield an average fractal dimension of 0.15, which suggests a very high degree of clustering. In contrast, on large scales, fractures tend to be more regular and evenly distributed with an average fracture dimension of 0.52; 2) fractal dimension varies with different sets in different orientations, which can be attributed to interactions between pre-existing fractures and younger ones, as well as variations of the intensity of the stresses under which the fractures were formed; 3) a time sequence of fracture set formation can be proposed based on fractal and multifractal analyses, which consists of (from old to young): N-S, NW, EN  相似文献   

评在岩浆演化过程研究中的微量元素“协变关系”说          下载免费PDF全文

李正吾 《地质找矿论丛》1999,9(3):83-87

借助微分理论指出了“协变关系”说是错误的。  相似文献   

多变量分形体数学模型及海底喷流沉积时空演化     

金友渔 《地球科学》1999,24(5):28

提出多变量分形体的数学模型,其可由各变量的自协方差函数和互协方差函数应用麦夯脱法进行迭代求解,以获取多变量线性组合系数b  相似文献   

Frequency–magnitude statistics and spatial correlation dimensions of earthquakes at Long Valley caldera, California     

D. J. Barton  G. R. Foulger  J. R. Henderson  & B. R. Julian 《Geophysical Journal International》1999,138(2):563-570

Intense earthquake swarms at Long Valley caldera in late 1997 and early 1998 occurred on two contrasting structures. The first is defined by the intersection of a north-northwesterly array of faults with the southern margin of the resurgent dome, and is a zone of hydrothermal upwelling. Seismic activity there was characterized by high b -values and relatively low values of D , the spatial fractal dimension of hypocentres. The second structure is the pre-existing South Moat fault, which has generated large-magnitude seismic activity in the past. Seismicity on this structure was characterized by low b -values and relatively high D . These observations are consistent with low-magnitude, clustered earthquakes on the first structure, and higher-magnitude, diffuse earthquakes on the second structure. The first structure is probably an immature fault zone, fractured on a small scale and lacking a well-developed fault plane. The second zone represents a mature fault with an extensive, coherent fault plane.  相似文献   

城镇体系空间结构的分形维数及其测算方法   总被引：140，自引：12，他引：128  

刘继生  陈彦光 《地理研究》1999,18(2):171-178

总结了刻画城镇体系空间结构的三种分形维数:聚集维数(半径维数)、网格维数和空间关联维数,阐释了各种维数的地理意义,然后以实例说明了它们的测算方法。  相似文献   

西藏樟木滑坡活动空间分布的分维特征及其地质意义   总被引：7，自引：3，他引：4  

易顺民  蔡善武 《山地学报》1999,17(1):63-66

依据分形理论,系统地研究了西藏樟木地区滑坡活动空间分布的分形特征。结果表明,滑坡活动的空间分布结构具有很好的统计自相似性,分维可作为滑坡活动空间分布的定量描述参数。区域性的滑坡活动空间分布的分维在急剧变化阶段同滑坡活动的高潮期相对应,分维的变化对滑坡预报有一定的指导意义。  相似文献   

分形布朗运动与地球化学测量——地壳中元素含量空间分布的定量表征   总被引：3，自引：3，他引：0  

李长江  麻土华 《地质论评》1999,45(1):76-84

地球化学面的形态是依赖于采样网格(采样密度)大小变化而不确定的。对于一维情况,元素含量分布曲线长度L与采样间距r之间的关系服从L(r)=Cr~(1-1/H),D=1/H。对于地壳上任一给定区域,沿某一测线进行地球化学测量的任一元素含量数据,由上式确定的D值和H值,对于沿测线方向该元素的含量分布在统计的意义上将是确定的。对浙江省水系沉积物测量数据的统计结果表明,Au、Ag、Cu、Pb、Zn、Mo、Co、Ni 8种元素的含量变化在1～150km尺度范围内遵循分形分布,D=1.03～1.62,H=0.62～0.97。这表明地壳中元素含量在空间上随采样间距的变化可能是一个完全等价于分形布朗运动的随机函数,在1～150km这个尺度范围内,元素含量分布模式具有自相似性和长程相关性。这个结果为“国际地球化学填图”项目(IGCP259)提出的160km×160km采样网格尺度提供了一种理论的支持。  相似文献   

航磁数据多重分形研究及应用   总被引：4，自引：0，他引：4  

王霞  吴新林  李克鲁 《铀矿地质》1999,15(6):356-360

利用航磁异常场的自仿射分形特征,计算出其分维值,把分维值转化成图形,进而分析其所反映的深层次构造特征。最后对分维值进行了拟合分析  相似文献