Late Paleozoic Lithofacies Paleogeography and Tectonic-sedimentary Evolution of Eastern South China
[Objectives]Following the Early Paleozoic Wuyi-Yunkai orogeny,eastern South China experienced a tectonically quiescent period in the Late Paleozoic,with large-scale marine transgression and thick sediment deposi-tion.Specifically,the nature of the strata in the Lower Devonian to the Kungurian stage of the Early Permian,such as isopach changes and lateral variation of lithofacies,are important for understanding the post-orogenic topography of eastern South China.[Methods]Stratigraphic thicknesses and lithological data for the region were collected and stra-ta isopach maps and lithofacies maps were compiled for six main epochs/ages:the Early,Middle and Late Devonian,the Early Carboniferous,the Late Carboniferous to the Sakmarian age of the Early Permian,and the Artinskian age to Kungurian age of the Early Permian.The tectonic subsidence rate of the basin at five different localities was calculat-ed for each epoch/age.[Results]The subsidence of the Late Paleozoic basin in eastern South China is divided into two stages:(i)a high subsidence rate(about 25 m/Ma)in the Devonian;and(ii)a low subsidence rate(about 10 m/Ma)in the Carboniferous to Kungurian age of the Early Permian.[Conclusions]Taking the regional widely-distributed and large-scale normal faults into consideration,it is speculated that the first stage of basin subsidence was mainly influenced by tectonic activity inherited from the post-Wuyi-Yunkai orogenic collapse and possibly the separation of South China from Gondwana during the Devonian.The second stage was controlled by the icehouse climate together with the sediment load in the basin during the Carboniferous to Early Permian.
South ChinaLate Paleozoicstrata isopach mapslithofacies mapsbasin subsidence
万方数据
维普
