济阳坳陷义东潜山构造发育特征及成山过程

Tectonic Development Characteristics and OrogenyProcess of Yidong Buried Hill in Jiyang Depression

摘要:

义东潜山发育于济阳坳陷义和庄凸起的东部，受控于印支、燕山、喜山等多期次的构造运动，潜山的构造演化过程和内部结构特征复杂，时空差异明显。NW向罗西断裂中生代逆推→正断的反转过程控制了义东地区潜山的整体发育，罗西1号、2号断裂将其分割成义古991潜山、义古80潜山、义古45潜山3个“山头”；NNE向的义东断裂新生代斜向拉伸作用导致义东地区新生代二次成山。SN、NW向次级断裂构成潜山网格状内幕断裂体系；潜山发育经历了早—中三叠世的稳定沉积→晚三叠世的NE—SW向挤压隆升剥蚀→早—中侏罗世的填平补齐→晚侏罗世的整体抬升→早白垩世的NE—SW向伸展断陷→晚白垩世的整体抬升→古近纪的NNW—SSE向伸展断陷→新近纪—第四纪的坳陷沉降的演化过程，体现了“挤、拉、滑”的复合作用，“沉、隆、剥”的交替过程。

Abstract:

Yidong buried hill is developed in the east of Yihezhuang uplift in Jiyang depression, Due to the control of the multiple tectonic movements of Indosinian, Yanshan and Himalayan, the structural evolution process and internal structural characteristics of buried hills are complex, and the spatiotemporal differences are obvious. The overall development of buried hills in Yidong area was controlled by the inversion process of NWtrending Luoxi fault from reverse to normal fault in Mesozoic. Luoxi 1 hao and 2 hao faults divided it into Yigu 991 buried hill, Yigu 80 buried hill and Yigu 45 buried hill. The Cenozoic oblique stretching of the NNEtrending Yidong fault led to the secondary mountain formation in the Yidong area. The SN and NW trending secondary faults constitute the buried hill gridlike internal fault system. The development of buried hill has experienced a multistage complex evolution process, which reflects the compound effect of ' stressing, pulling and sliding ' and the alternating process of "sinking, uplifting and stripping".