PARTICLE-SIZE DISTRIBUTION OF CATACLASTIC FAULT MATERIALS FROM SOUTHERN CALIFORNIA - A 3-D STUDY

被引:82
作者
AN, LJ
SAMMIS, CG
机构
[1] Department of Earth Sciences, University of Southern California, Los Angeles, 90089-0740, CA
关键词
PARTICLE SIZE DISTRIBUTION; FAULT GOUGE; POWER LAW; LOG-NORMAL; FRAGMENTATION;
D O I
10.1007/BF00874329
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The particle size distributions of fault gouge from the San Andreas, the San Gabriel, and the Lopez Canyon faults in Southern California were measured using sieving and Coulter-Counter techniques over a range of particle sizes from 2 mu m to 16 mm. The distributions were found to be power law (fractal) for the smaller fragments and log-normal by mass for sizes near and above the peak size. The apparent fractal dimension D of the smaller particles in gouge samples from the San Andreas fault, the San Gabriel fault and the Lopez Canyon gouge were 2.4-3.6, 2.6-2.9 and 2.4-3.0, respectively. The average D for the Lopez Canyon gouge was 2.7 +/- 0.2, which is in agreement with earlier studies of this gouge using planar 2-D sections. The fractal dimension of the finer fragments from all three faults is observed to be correlated with the peak fragment size, with finer gouges tending to have a larger D. A computer automaton is used to show that this observation may be explained as resulting from a fragmentation process which has a ''grinding limit'' at which particle reduction stops.
引用
收藏
页码:203 / 227
页数:25
相关论文
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