摘要
乌尔逊凹陷是海拉尔盆地中一个大型的西断东超并具有走滑性质的中新生代箕状凹陷,凹陷内主要发育3个方向的犁式控陷正断层组合(北东向、南北向和北东东向)以及断层相关褶皱。在凹陷发育过程中,经历了前人公认的伊敏组沉积末期的强烈挤压作用,研究还发现,大磨拐河组沉积之前也发生了一次大规模的强烈挤压作用,并持续到伊敏组下段沉积时期。乌尔逊凹陷的变形序列为:(1)北西南东向的强烈拉张作用阶段;(2)北西南东向的挤压作用阶段;(3)近东西向的张扭作用阶段;(4)近东西向的强烈压扭作用阶段;(5)近东西向微弱拉张作用阶段。
Urxun sag is a large unsymmetrical fault-depression sag with strike-slip characteristics in Mesozoic-Cenozoic in Hailaer Basin. the structural system includes three orientations of plow-growthnormal faults （NE, SN and NEE） and fault related folds. Besides the intensive pressing at the end of the Yinmin Formation period that has been reported by many researchers, the study suggests that there occurred another intensive pressing from the pre-Damoguaihe Formation to the beginning of the Yinmin Formation period. The sequence of the deformation in Urxun sag is： （1）the NW-SE intensive stretching; （2）the NW-SE pressing; （3）the E-W intensive tenso-shearing; （4）the near E-W intensive compresso-shearing; （5）the near E-W slight stretching.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2006年第2期215-220,共6页
Journal of Jilin University：Earth Science Edition
基金
大庆油田有限责任公司勘探开发研究院项目(12010022002100277
2004)
吉林大学大学生创新基金项目(2004CX10
2004)
