Particle size distribution of cataclastic fault materials from Southern California: A 3-D study
Particle size distribution of cataclastic fault materials from Southern California: A 3-D study
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南加州碎裂断层材料的粒度分布：3D 研究
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
C. Sammis
中科院分区：
文献类型：
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作者：
L. An;C. Sammis
采用筛分和库尔特-计数器技术测量了来自南加州圣安德烈亚斯、圣加布里埃尔和洛佩斯峡谷断层的断层泥的粒度分布，粒度范围为2 μm至16 mm。发现较小碎片的粒度分布为幂律（分形），峰值大小附近和之上的粒度分布为质量对数正态分布。San Andreas断层、San Gabriel断层和洛佩斯峡谷断层泥样品中较小颗粒的表观分维D分别为2.4-3.6、2.6-2.9和2.4-3.0。洛佩斯峡谷断层泥的平均D值为2.7±0.2，这与使用平面二维剖面对该断层泥进行的早期研究一致。从所有三个故障的更精细的碎片的分形维数被观察到与峰值碎片的大小，与更精细的断层泥往往有一个largerD。一个计算机自动机被用来表明，这一观察结果可能被解释为从一个破碎过程中，有一个“研磨极限”，在该颗粒减少停止。
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 μm 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 dimensionD 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 averageD 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 largerD. 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.