关键词: 六盘山断裂, 断层泥, 组构, 断层活动

Abstract: The mode of slipping along the eastern Liupanshan piedmont fault zone is analyzed through both macroscopic and microscopic investigations. The results show that (1)this fault zone can be divided into north,middle and south three segments based on the characteristics of the fabric from fault gouge. This is consistent with the result from macroscopic along the fault zone in recent years.(2)local strong deformation, traction fold, Riedel shears angle (R₁) being in the range of 11°～26°, P foliation and randomly preferred orientation of illite mineral that developed within the fault gouge are indication of stick slip and left lateral strike-slip along the north segment.(3)general deformation, Riedel shears being at angle of 11°or less, banded foled, ptygmatic structure and polygemic preferred orientation of illite mineral that developed within the fault gouges are the indicators of creep slip and reverse slip along the middle and south segments.

Key words: Liupanshan fault, Fault gouge, Fabric, Fault activity