皖南浙西地区下奥陶统沉积相及岩相古地理演化  

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

作　　者：乔国栋[1,2] 马志远[1,2] 谈晓樱 奎明娟 王伟[1,2] 

机构地区：[1]青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012 [2]青海省地质调查院,青海西宁810012 [3]青海省第一地质勘查院,青海平安810600 [4]青海省第三地质勘查院,青海西宁810029

出　　处：《甘肃冶金》2016年第4期59-63,共5页Gansu Metallurgy

摘　　要：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。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.

关 键 词：下奥陶统 江南古陆 华夏古陆 岩相古地理 

分 类 号：P534.42[天文地球—古生物学与地层学]