Fault gouge : rock magnetic and structural study

我们从岩石磁学的角度进行了一系列实验，从断层泥中获取新的信息。结果表明：1)我们安装了广钢KLY-3S，并对其可靠性进行了精确的测试。我们发现PJ(各向异性程度)和T(形状参数)在磁化率各向异性(AMS)的参数化中都是有用的。2)我们在三山山-基塔断裂(佐藤市)的活动断层泥中取样。断裂面附近样品呈铅笔状，最大轴平行于断层面走向，最小轴呈环状分布。在断裂面以外采集的其他样品呈有序的沉积披萨形状。最大轴似乎被限制在断层面上，这将进一步限制断层的运动方式。3)我们还收集了出露宽断层泥的Kabuto-gawa断层(Suzuka-Gun)的样品。样品中的AM完全呈扁平形状。扁平面既不与断裂面平行，也不与沉积面平行。

We conducted series of experiment to obtain new information from fault gouge from view point of rock magnetism. The results ara follows :1) We have installed GISCO's Kappabridge KLY-3S and tested its reliability precisely. We found Pj (degree of anisotropy) and T (shape parameter) are both useful in parameterizing anisotropy of magnetic susceptibility (AMS).2) We sampled fault gouge at the active Sanageyama-kita Fault (Seto City). Samples from the close vicinity of the fault plane show pencil structure of AMS.The maximum axis is parallel with the strike of fault plane, whereas the minimum axis distributes as girdle. The other samples collected apart from the fault plane show ordinal sedimentary pizza shape. The maximum axis seems to be confined on the fault plane, whichi will give further constraints about the mode of movement of the fault.3) We also collected samples from the Kabuto-gawa Fault (Suzuka-gun) where wide fault gouge cropped out. AMS of the samples show oblate shape exclusively. The plane of oblate is neither parallel with the fault plane nor with sedimentary plane.