地质科学2012，Vol.47Issue(4)：1130-1150,21.
渤海海域郯庐断裂带新生代活动方式与演化规律——以青东凹陷为例
Cenozoic activity methods and evolution of the Tan-Lu fault zone in Bohai Bay:Evidence from the Qingdong Sag
摘要
Abstract
Western branch of the Tan-Lu fault zone lies along the eastern boundary of the Qingdong Sag in Bohai Bay. The Tan-Lu faults consists of 4 left-step,en-echelon faults. They show normal faulting on cross-sections and local flower structures related to transtension or transpression. The Tan-Lu faults along the Qingdong Sag evolved from dextral normal faulting of Paleogene, reverse dextral faulting at the end of Paleogene, weak normal faulting of Neogene to reverse dextral faulting of Quaternary. The pre-existing Tan-Lu faults reacted as dextral normal faults under oblique N-S extension due to their lower strengths during Paleogene rifting, leading to formation of the 4 left-step, en-echelon faults at shallow levels. Paleogene deposition patterns in the sag were controlled by the Tan-Lu faults,NW-striking basement faults and E-W new normal faults. The Basin inversion at the end of Paleogene terminated development of the rifted basin and caused reverse dextral faulting of the Tan-Lu faults due to regional ENE-WSW compression. Weak faulting was associated with the Neogene depression related to lithospheric thermal subsidence, and the Tan-Lu faults show weak normal faulting. The Tan-Lu faults switched into reverse dextral faulting since the beginning of Quaternary.关键词
青东凹陷/新生代/郯庐断裂/活动方式/构造演化/右行平移Key words
Qingdong Sag, Cenozoic, Tan-Lu fault, Activity method, Structuralevolution, Dextral displacement分类
天文与地球科学引用本文复制引用
詹润,朱光..渤海海域郯庐断裂带新生代活动方式与演化规律——以青东凹陷为例[J].地质科学,2012,47(4):1130-1150,21.基金项目
国家自然科学基金项目(编号:90714004,91114206)资助. （编号:90714004,91114206）
