Abstract: This paper deals with the latest Pleistocene faulting on the Canfangying segment of the faultzone along the northern margin of the Yanqing basin from the data of one trench, three geologicprofiles, seven fault scarp morphologic profiles across the late Pleistocene deposit surface and fif-teen radiometric datings. These data indicate two faulting events occurring during the latestPleistocene time. The last event is dated to be 9870±130～11800±1000a B.P.,less than 13200±1100a B.P., and the earlier one is dated to be 19850±1550a B.P., with displacement perevent 3.34～3.64m and recurrence interval between events 9980a. Vertical displacement ratesince about 21050±1600a B.P. is estimated to be 0.31～0.34mm/a. The latest Pleistocenefaulting on the Canfangying segment is characterized by larger surface displacement and longerrecurrence interval, without similar faulting event occurring during the Holocene time.

Key words: Yanqing basin, fault zone, Canfangying segment, late Pleistocene, faulting

摘要： 通过1个探槽记录、3个地质学剖面、7个晚更新世沉积物表面断层崖形态学剖面和15个放射性测年数据,论述了延庆盆地北缘断裂带蚕房营段的晚更新世晚期断层作用。这些资料显示出该时期内的两次断层作用事件:最近的一次发生在9870±130～11800±1100a B.P.之间,最早不超过13200±l100a B.P.;较早一次的发生时间为19850±1550a B.P.。一次事件的位移量3.34～3.64m,两次事件之间的重复间隔9980a.大约自21050±1600a B.P.以来的垂直位移速度计算为0.31～0.34mm/a.蚕房营段的晚更新世晚期的断层作用,以较大的表面位移量和较长的重复间隔为特征。全新世没有类似的断层作用事件。

关键词: 延庆盆地, 北缘断裂带, 蚕房营段, 晚更新世, 断层作用