摘要
在中国东部地区,很难见到错动第四纪地层的断层剖面。在安徽省南陵县南陵至繁昌公路西侧,离南陵县城约2km处(30°55′456″N;118°17′774″E),见到南陵断层错动第四纪地层的剖面,此断裂在卫星影像上有所显示,但是,仅局限于南陵盆地南侧,其西北端终止于小丹阳-方山断裂,长度只有20km,走向NW,断面倾向SW。剖面中,断层由2条小断层组成,至少显示2期活动,第1期在中更新世之前,可能在早更新世;第2期则在中更新世或以后。最新活动为逆冲性质,逆冲位错量有40cm。此剖面显示在中国东部地区NW向断层虽然规模小但活动新。
In the eastern mainland of China there are few cross sections of faults where dislocation of Quaternary strata can be observed. However,recently we found such a profile about 2km away from the Nanling county, Anhui Province （ 30°55 ′456＂N, 118°177′74＂E ） , west to the highway from Nanling to Fanchang. This fault has been identified on the satellite image,but its trace is confined to the southern side of the Nanling Basin. Our field investigation indicates that the northwestern end of this fault lies at the Xiaodanyang-Fangshan Fault. It is only 20km long,striking in NW,dipping to southwest. From observations on the profile, it consists of two small fractures and has two periods of activity at least. The first active period is before middle Pleistocene time, or probably in early Pleistocene. And the second active period is in or after middle Pleistocene. Its latest motion is of thrust with an amount of dislocation of 40cm. This fault cross section shows that the NW-trending faults in the eastern Mainland of China have new activities,though on small scales in general.
出处
《地震地质》
EI
CSCD
北大核心
2008年第1期333-338,共6页
Seismology and Geology
基金
国家科技支撑计划项目子专题(2006BAC13B010202)资助
关键词
第四纪
南陵断层
活动时代
Quaternary, Nanling Fault, active time
