安徽铜陵及邻区早石炭世沉积古地理

依据前人研究结果及实测剖面资料、基于层序地层所获得的沉积古地理的研究结果表明:以安徽铜陵为中心区域的研究区,在早石炭世沉积层序CSQ1沉积时期存在呈北东—南西向延展、包含繁昌—铜陵—贵池在内的剥蚀区——繁贵岛,自CSQ2沉积晚期该岛被海侵海泛分割为铜陵北东的繁岛和南西的贵岛两部分,并存续至CSQ3沉积末期;繁贵岛和繁岛、贵岛两侧以及繁岛与贵岛之间为海相、滨海平原相沉积区,发育有浅海相碳酸盐、混有陆源碎屑的碳酸盐以及滨浅海和滨海平原陆源碎屑沉积,各沉积带主要呈北东—南西向展布。此外在CSQ3沉积晚期还发育有潮坪碳酸盐沉积。随着海平面变化,沉积区扩大,岛区缩小,沉积带类型及其空间位置发生变化和迁移摆动。沉积古地理的变化表明,在CSQ1和CSQ3两沉积时期分别发育同沉积断裂(带),后一期断裂横穿原繁贵岛而导致铜陵地区新生海区形成,构成可能的海底热水喷流沉积成矿的构造与古地理背景。

Sedimentary palaeogeography of the Early Carboniferous in Tongling and its adjacent areas in Anhui Province

The Early Carboniferous palaeogeography and sediments in Tongling district of middle Anhui is taken as a center area.Researches of sequence stratigraphy were carried out.The research results indicate that there might be an island named Fangui Island including Tongling,Fanchang and Guichi in the period of the CSQ1,which is the lowest one of the three depositional sequences in the Early Carboniferous.From the late period of CSQ2 to the period of CSQ3,the sea water with marine flooding divided the Fangui Islan...