ON SEDIMENTARY CHARACTERISTICS AND TECTONIC ENVIRONMENT FOR THE BASINS OF EARLY PALAEOZOIC IN ZHE-WAN-GAN-MIN REGIONS (PROVINCES OF ZHEJIANG-ANHUI-JIANGXI-FUJIAN)

With the view of the characteristics and distribution of sedimentary facies, the original environments for iso-sedimented rocks,deep-water distant-sourced turbidites in Cambrian of Gannan (South Jiangxi) and Minbei (North Fujian) and shallow water near-sourced turbidites in the upper Ordovician in Zhexi (west Zhejiang) were mainly analysed and the schema of lithofacies distribution for each period (series) of the early Palaeozoic were drafted. The authors proposed that regional northwestward piece together and connecting-pressing begun at the end of the middle Ordovician caused a uplift in South China (including Fujian and Zhejiang), and a seesaw-typed reverse of the structure-sedimentation framework in the study area, where there had been a platform from northwest to southeast or a southeastward palaeo-passive continental margin during the Sinian-middle Ordovician, which were transformed into another structural-sedimentary framework of an intraplate basin with its center in the northwest and it was gradually drifted toward northwest from the late Ordovician to Silurian.