摘要： 下扬子地区在寒武纪处于相对稳定的克拉通盆地背景,盆地沉积格局基本上为两坳夹一隆的特点,中部以碳酸盐岩台地沉积为特征,南北为深水碎屑沉积与碳酸盐沉积为特征。作者以下扬子发育的野外露头为主要研究对象,通过精细测量与观测南京、巢湖、杭州等12个露头点露头资料,建立了下扬子地区寒武纪的层序地层格架。寒武纪可划分为2个二级层序及14个三级层序,作者首次以二级层序体系域为单元对寒武纪进行了岩相古地理编图,并对寒武纪层序—古地理演化3个关键的控制因素进行了分析。下扬子区寒武纪古地理格局相对稳定,继承性地发育了开阔台地、局限台地、台地边缘斜坡、盆地等沉积相类型。

关键词: 下扬子区, 寒武纪, 层序, 岩相古地理

Abstract: The Lower Yangtze area was a stable craton basin during Cambrian. It was uplifted in the Center Lower Yangtze area,and downwarped in both the south and the north areas. There were carbonate rock platform facies in the Center Lower Yangtze area,and mainly deep water clastic rock and carbonate rock deposition in the south and the north areas. Based on 12 outcrops observation including Nanjing,Chaohu, Hangzhou and other areas,2 second-order sequences and 14 third-order sequences were recognized,and the sequence stratigraphic framework of the Lower Yangtze area in Cambrian was established. Using second-order sequences system tract as time unit, lithofacies palaeogeography maps of the Cambrian were established.The sequence-palaeogeography evolution was controlled by 3 critical factors.The palaeogeographic framework was relatively stable,and open platform facies, restricted platform facies,platform edge slope facies,basin facies, etc., were successively developed in the Cambrian.

Key words: Lower Yangtze area, Cambrian, sequence, lithofacies palaeogeography

中图分类号: 

• Q915.5