皖南浙西地区下奥陶统沉积相及岩相古地理演化

通过对下奥陶统岩性组合、古生物、岩层厚度、沉积特征的研究,表明研究区在早奥陶世发育开阔台地、台缘浅滩、台缘斜坡、浅海陆棚及盆地等五种主要的沉积类型;古地理演化表明早奥陶世研究区为一个海退过程;沉积格局显示,早奥陶世华夏古陆的边缘应当在皖南浙西江绍断裂更远端,早奥陶世研究区不存在江南古陆。

Sedimentary Faces and Litho-paleogeographic Evolution of the Lower Ordovician in Southern Anhui and Westen Zhejiang

Based on large quantities of lithologic association, paleontology, rock thickness and sedimentary structure data, the authors have studied in detail sedimentary faces, paleogeographic characteristics and evolution of the Lower Ordovician in southern Anhui and eastern Zhejiang Province.The conclusion shows that the Lower Ordovician mainly deposited on open platform, platform margin, platform slope, neritic shelf and basin, In the early Ordovician.The area underwent a large-scale regression, and the Kiangnan ancient land might not exist then, the rim of Cathysia will have a long way from the crack belt between Southern Anhui and Western Zhejiang.