摘要
汝州地区上寒武统底部新发现一个平行不整合面 ,其特征主要表现为铁质风化壳、古岩溶地貌、下伏地层缺失及生物化石带不连续等。它是中寒武世晚期 ,由于海平面下降、地表暴露、沉积相朝盆地方向迁移产生剥蚀截断而形成的。依据岩石地层学和层序地层学理论 ,作者对汝州地区的上寒武统岩石地层单位进行了重新厘定 ,并认为晚寒武世地层为一较完整的具Ⅱ型界面的Ⅲ级层序。
The subface of Upper Cambrian in Ruzhou area is a parallel unconformity interface.It mainly displays the ferruginous crust of weathering,paleokarst landform,underlying stratigraphic gap,the discontinuity of the biozone and so on.It was formed in the late period of Middle Cambrian due to the relatively downthrowing of the sea level,exposure of the earth's surface,and that wandering of sedimentary facies towards basin led to denuding.According to the theory of lithostratigraphy and sequence stratigraphy,the author has redivided the lithostratigraphic unit of the Upper Cambrian in Ruzhou area and considerred that the strata of Upper Cambrian is a relative complete Ⅲ-stage sequence of 1-type sequence boundary.
出处
《河南地质》
2000年第2期107-112,共6页
Henan Geology
关键词
不整合面
上寒武统
岩石地层
层序地层
划分对比
Ruzhou
unconformity
Upper Cambrian
lithostratigraphy
sequence stratigraphy
division and correlation
