【摘要】 西江断裂是控制三水断陷盆地以至西、北江三角洲的西缘断裂,基本相当于西江的北西向河段,断裂迹象两岸断续可见。对该断裂的认识随工作程度的增高而渐趋明朗。本文基于地质新年代学方法,结合显微构造、构造地貌等观察资料以及其它测试手段,对该断裂南东段的近期活动作较深入的探讨。基本结论是:(1)该断裂在中更新世中期有过相对较强的活动,其后活动性渐趋减弱;(2)近期的微量活动属于弱形变和微弱形变。更多还原

【Abstract】 Xijiang fault is a western boundary fault which controlled the Sanshui fault basin as well as the Xijiang-Beijiang delta. This fault stretches along the NW-trending of Xijiang river and its traces can be seen in both river bank intermittently. Recognition of this fault is becoming clear with the depth of the research. In this paper, the authors further discuss the recent activity cf SE-section in this fault based on the geological chronology, microtectonics, morphotectonics and other determinations. The basic conclusions are:1) in Mid-Pleistocene, this fault has a relatively stronger active stage, afterwards its activity became weaken gradually. 2) in recent geological times, its micro activity belongs to the type of weak or feeble deformation.更多还原