现代地质Issue(6)：1234-1242,9.
磁性地层年代对北京平原顺义断裂第四纪活动性的约束
Quaternary Magnetostratigraphic Time Framework Constraints on Activity Characteristics of the Shunyi Fault,Beijing Plain
摘要
Abstract
Shunyi fault is one of Quaternary active faults in northeastern Beijing plain.Its activity is regarded as one of potential geological disasters to the urban security.In order to reveal the activity history of Shunyi fault,the magnetostratigraphy research was conducted on borehole ZK12-1 at the footwall of fault.The detailed stepwise thermal demagnetization isolated two components, and the characteristic remanent magnetization (ChRM)with moderate downward or upward inclinations was identified after removing a low-stability drilling-induced remanence with steep downward inclinations.Combined with the lithologic association of the core,a magnetostratigraphic frame of borehole ZK12-1 was established.Based on the magnetostratigraphic framework of borehole ZK12-1 at footwall and borehole ZK12-2 at the hanging wall and the distance of the vertical movement, the vertical activity rates between the hanging wall and footwall of Shunyi fault were computed to be 0.023 mm/a in the Early Pleistocene,0.001,7 mm /a in the Middle Pleistocene,0.033 mm /a in the Late Pleistocene and 0.051 mm /a in the Holocene.These results indicate Shunyi fault activated strongly in the Early Pleistocene and activated weakly in the Middle Pleistocene.In the Late Pleistocene,this fault became much more active,and in the Holocene it experienced the strongest activity.关键词
磁性地层学/顺义断裂/北京平原/活动速率/第四纪Key words
magnetostratigraphy/Shunyi fault/Beijing Plain/activity rate/Quaternary分类
天文与地球科学引用本文复制引用
白凌燕,张磊,蔡向民,王继明,杨天水,吴怀春,何静,张晓亮,赵勇..磁性地层年代对北京平原顺义断裂第四纪活动性的约束[J].现代地质,2014,(6):1234-1242,9.基金项目
北京市国土资源局“北京平原区活动断裂监测专项地质调查项目”（京国土环［2009］308）。 （）
