论浙皖赣闽地区早古生代盆地沉积特征及其构造环境

本文从沉积相特征及其展布入手,重点剖析赣南、闽北寒武系浊积岩,深水远源浊积岩与浙西上奥陶统浅水近源浊积岩的成因、环境,草编了早古生代各纪(统)的岩相略图,提出中奥陶世末期起的向北西方向拼贴挤压使南华(包括浙闽)隆起、并使研究区的沟造-沉积格局发生翘翘板式逆转:震旦纪—中陶奥世从北西到东南为台地和面向东南的被动陆缘,晚奥陶世—志留纪转化为盆地中心位于北西、并逐渐向北西迁移的板内盆地的构造-沉积格局。

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.