大别山地区构造地貌特征

大别山位于江淮之间,跨皖、鄂、豫三省,与其东端的张八岭和西端的鸡公山、桐柏山合称淮阳山脉。它由西北向东南延伸,在湖北省的黄梅附近转向东北,地势上为向南凸出的弧型山系,相当于李四光提出的淮阳弧构造。大别山是淮阳山脉的主体,山势较高,1500米以上山峰都集中于皖、鄂、豫三省交界处一带,形成岗峦起伏,群峰突起的壮丽景观。

GEOMORPHOTECTONIC FEATURES OF THE DABIESHAN AREA, CHINA

Some geomorphotectonic types observed in eastern Dabieshan area and its neighborhood are described in this paper. They include trellis drainage pattern, graben valley, faulted block mountain, dislocation basin, valley kink point, and incised meander, as well as faulted triangular facets and trapezoidal facets etc. The development of multiple beveling planes occurring in the area under investigation may be subdivided into three different stages, i.e. Dabie stage (Late Jurassic), Huoshan stage (Early Tertiary) and Huainan stage (Pliocene-Pleistocene). Some major geomorphotectonic types related to recent seismic activities and their evolution are preliminarily discussed here.It is revealed that the different geomorphotectonic types and their developmental history are controlled by some faulted zones with various trends and different degree of activity. Consequently, the existence of multiple beveling planes as well as the appearance of recent seismic activities and neotectonic faulting are closely associated with the revival of old faults.