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首页> 外文期刊>International Journal of Geosciences >Assessment of the Relationship between ESR Signal Intensity and Grain Size Distribution in Shear Zones within the Atotsugawa Fault System, Central Japan
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Assessment of the Relationship between ESR Signal Intensity and Grain Size Distribution in Shear Zones within the Atotsugawa Fault System, Central Japan

机译：日本中部Atotsugawa断层系统内剪切带内ESR信号强度与粒度分布之间关系的评估

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摘要

For the first time, a relationship between ESR signal intensity and grain size distribution (sieve technique) in shear zones within the Atotsugawa fault system have been investigated using fault core rocks. The grain size distributions were estimated using the sieve technique and microscopic observations. Stacks of sieves with openings that decrease consecutively in the order of 4.75 mm, 1.18 mm, 600 μm, 300 μm, 150 μm and 75 μm were chosen for this study. Grain size distributions analysis revealed that samples further from the slip plane have larger d50 (average gain size) (0.45 mm at a distance of 30 - 50 mm from the slip plane) while those close to the slip plane have smaller d50 values (0.19 mm at a distance of 0 - 10 mm from the slip plane). This is due to intensive crushing that is always associated with large displacement during fault activities. However, this pattern was not respected in all shear zones in that, larger d50 values were instead observed in samples close to the slip plane due to admixture of fault rocks from different fault activities. Results from ESR analysis revealed that the relatively finer samples close to the slip plane have low ESR signals intensity while those further away (coarser) have relatively higher signal intensity. This tendency however, is not consistence in some of the shear zones due to a complex network of anatomizing faults. The variation in grain size distribution within some of the shear zones implies that, a series of fault events have taken place in the past thus underscoring the need for further investigation of the possibility of reoccurrence of faults.
机译：第一次，使用断层岩心研究了在Atotsugawa断层系统内剪切带中ESR信号强度与粒度分布（筛技术）之间的关系。使用筛技术和显微镜观察来估计晶粒尺寸分布。本研究选择了开孔顺序依次减小的筛网堆，分别为4.75 mm，1.18 mm，600μm，300μm，150μm和75μm。粒度分布分析表明，距滑移面较远的样品的d50值较大（平均增益尺寸）（距滑移面30-50 mm处为0.45 mm），而靠近滑移面的样品的d50值较小（0.19 mm）距滑面0-10 mm的距离）。这是由于在压裂活动期间强烈的挤压总是伴随着大的位移。但是，这种模式并未在所有剪切带中都得到遵守，因为由于来自不同断层活动的断层岩石的混合，在靠近滑动面的样品中观察到了更大的d50值。 ESR分析的结果表明，靠近滑动面的相对较细的样本具有较低的ESR信号强度，而较远的样本（较粗）则具有相对较高的信号强度。然而，由于复杂的解剖断层网络，这种趋势在某些剪切带中并不是一致的。某些剪切区内晶粒尺寸分布的变化意味着过去发生了一系列断层事件，因此强调了需要进一步研究断层再次发生的可能性。

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