海原活动断裂中断层泥的特征、成因及其对断层滑动性能的影响

THE CHARACTERISTICS AND THE CAUSE OF THE FORMATION OF THE GOUGE FROM HAIYUAN ACTIVE FAULT ZONE AND ITS EFFECT ON THE SLIDING BEHAVIOR OF THE FAULT ZONE

摘要:

本文对海原断裂的断层泥的各类特征进行了系统的研究,分析了断层泥带内部的小型断裂类型,探讨了断层泥组分的有机地球化学意义。通过对比,确立了石英碎屑表面机械作用成因的电子显微构造特征组合为活断层的判别标志。本文将石英碎屑表面电子显微溶蚀构造分为五类,据此分析了断层活动时期和状态。研究中还发现了断层泥带内部电子显微结构类型,进而分析了断层活动与微结构、粒度分布间的关系。最后还讨论了断层泥形成演化过程以及断层泥对全新世以来断层滑动性能影响及其与地震活动的关系.

Abstract:

This paper makes a systematic study for all kinds of the characteristics of the gouge from Haiyuan active fault zone.The kinds of the small-sized faults in the gouge zone have been investigated.The implication of the organic geochemistry of the composition of the gouge is approached.A combination of various SEM micro-surface textures on quartz fragments in gouges caused by mechanical movements of faults is advanced through ihe study in contrast with each of the combinations in eight enviroments.The combination in gouges is regarded as a sigh to determine an active fault.The SEM micro-surface dissolved textures on quartz fragments in the gouge are classified into five types.The age and the state of the active faults are analysed on the based of five types.The types of the SEM micro-textures in the gouge are discovered.The relations between the active faults and the micro-textures and the distribution of grain size in the gouge are analysed.The formation and the evolution of the gouge are discussed.The effect of the gouge on the sliding behavior of the fault zone in Holocene Epoch and the relation between the gouge and the earthquakes are studied.