南华北地区中新生代盆地演化

Analysis of evolution of Meso-Cenozoic basins in southern North China

黄泽光 高长林 吉让寿

Huang Zeguang Gao Changlin Ji Rangshou

大别造山带晚侏罗世—早白垩世火山岩为高含钾的碱性岩,对应的构造环境不是消减带,但与板块消减有关;郯庐断裂在晚侏罗世—早白垩世为右行平移活动,活动性质为张扭性。南华北中新生代盆地,由于所处具体构造位置不同而有明显差异。以平舆-蚌埠隆起为界,南部坐落在大别造山带逆冲前缘地带,如合肥-信阳盆地,为具挤压造山形成的前陆盆地原型、张扭性形成的走滑盆地原型、拉张反倾正断和平移-断陷盆地原型组成的三重叠合盆地。北部坐落在相对稳定陆块之上,对应形成挤压前陆盆地-陆内坳陷盆地原型、走滑盆地原型、弱挤压形成的坳陷盆地-张扭盆地-断陷盆地原型、整体沉降形成的坳陷盆地原型组成的多重叠合盆地。

The Late Jurassic-Early Cretaceous volcanic rocks in Dabie orogenic belt are alkali rocks with high potassium content. The corresponding tectonic setting was not a subduction zone, but had certain relationship to plate subduction. The Tancheng-Lujiang fracture zone was characterized by its intenso-wrench or dextral strike-slip movement during Late Jurassic-Early Cretaceous. The Meso-Cenozoic basins in southern North China have significant differences, due to their specific tectonic settings. Taking Pingyu-Bangbu uplift as a boundary, the southern basins, located in the thrust front of Dabie orogenic belt, such as Hefei-Xinyang basin, are triple overlapping basins, which are composed of foreland basin prototype as a result of compressional orogenesis, strike-slip basin prototype as a result of tenso-wrench movement, and extensional counter-inclined normal fault and strike-slip faulted basin prototype. While the northern basins, located in relatively stable landmass, are multiple overlapping basins, which are composed of compressional foreland basin-intracontinental depression prototype, strike-slip basin prototype, depression,transtensional and faulted basin prototype as a result of weak compression, and depression basin prototype as a result of mass subsidence.

10.11743/ogg20050220