冀中坳陷中区中生代中晚期大型拆离滑覆构造的确定

晚侏罗世至早白垩世 ,太行地区受区域热构造事件的影响 ,燕山期的岩浆活动达到高潮 ,并由此引发了阜平、赞皇变质核杂岩的强烈拱升及浅层的侧向伸展拆离作用 ,在阜平变质核杂岩东侧的冀中坳陷中区形成了西部伸展而东部挤压的有机相连、有序发展的拆离滑覆构造体系 ,波及宽度达 1 5 0km。其后缘伸展区表现为变质核杂岩内的韧性剪切带、盖层内的拆离伸展断层及伴随的断陷盆地 ;而前缘挤压区形成叠瓦状逆冲推覆构造体系 ;介于二者之间的中部过渡带构造变形相对较弱

EVIDENCES FOR THE LARGE-SCALE DETACHMENT STRUCTURE IN MIDDLE AREA OF JIZHONG DEPRESSION IN MID-LATE MESOZOIC PERIOD

The Taihang Mountains area underwent a violent thermal-tectonic incident, which results in extensive magmatic activity from late Jurassic and early Cretaceous. Fuping and Zanhuang metamorphic core complexes were formed and uplifted quickly together with the thermal process, which is followed by the formation of a large scale lateral extensional detachment structure and the extensional and rifting tectonic environment in the west and compression and uplifting setting in the east of the middle area of Jizhong depression. In the rear extensional zone ductile shear belt in metamorphic core complex and detachment faults in covers as well as rift basin were formed, in the frontier compressed zone thrust faults were formed, but the deformation between the rear and the frontier is generally weak.