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皖南东至地区寒武系层序地层研究
引用本文:吴跃东.皖南东至地区寒武系层序地层研究[J].古地理学报,2001,3(3):55-62.
作者姓名:吴跃东
作者单位:安徽省地质调查院 安徽 合肥 230001
摘    要:皖南东至地区寒武系在地层分区上可以分为下扬子地层分区、过渡地层分区和江南地层分区,生物群上出现了两区特征分子和过渡区的混生现象,并处于台地与盆地交接部位。通过对分别位于台地、斜坡和盆地露头层序地层研究,将寒武纪地层自下而上划分为三个Ⅱ类沉积层序和二个Ⅰ类沉积层序,早寒武世的三个Ⅱ类沉积层序的陆架边缘体系域不发育;中寒武世晚期到晚寒武世的二个Ⅰ类沉积层序皆由低水位体系域、海侵体系域和高水位体系域 组成三元结构。通过层序地层分析和沉积体系演化建立了相应的海平面变化曲线,自早寒武世早期本区海平面达到最高位和最大上升速率后,至寒武纪末研究区海平面总体处于下降过程,即海平面为累进式的缓慢的下降。

关 键 词:皖南  东至地区  寒武系  层序地层
文章编号:1671-1505(2001)03-0055-8
修稿时间:2000年8月1日

SEQUENCE STRATIGRAPHY OF THE CAMBRIAN IN THE DONGZHI REGION OF SOUTHERN ANHUI PROVINCE
Wu Yuedong Anhui Institute of Geological Survey,Hefei.SEQUENCE STRATIGRAPHY OF THE CAMBRIAN IN THE DONGZHI REGION OF SOUTHERN ANHUI PROVINCE[J].Journal of Palaeogeography,2001,3(3):55-62.
Authors:Wu Yuedong Anhui Institute of Geological Survey  Hefei
Institution:Anhui Geological Survey, Anhui, Hefei, 23001
Abstract:The Cambrian in the Dongzhi region of southern Anhui Province can be divided into 3 stratigraphic subregions of Lower Yangtze, Jiangnan and the transitional subregions. Each of former two subregions has its own characteristic components for their biota while the transitional subregion has the mixed components for its biota. Dongzhi region is located at the junction of the platform and basin. Sequence stratigraphy study on the outcrops at the platform, ramp and basin reveals that the Cambrian in this region can be divided into 3 types of pattern II and 2 types of pattern I depositional sequences from bottom to top. The shelf margin tract systems of 3 types of pattern II sequences of the Early Cambrian are not developed. The 2 types of pattren I sequences from the late Middle Cambrian to the Late Cambrian are all composed of LST, TST and HST. Based on analysis of the sequence stratigraphy and the evolution of the sedimentary system tracts, the sea level curves of these periods have been reconstructed. The sea level attained its highest position with a fastest rise in the early Early Cambrian. Since then, from the middle Early Cambrian to the end of the Late Cambrian, the sea level experienced a slow and gradual fall.
Keywords:southern Anhui Province  Dongzhi region  Cambrian  sequence stratigraphy
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