• 责任者：Zhang Hua (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Shi Zhiqiang
• 刊名：Journal of Chengdu University of Technology
• 出版年：2011
• 卷期：38(2)
• 关键词：早三叠世 ; Lower Triassic ; 晚二叠世 ; Upper Permian ; 绝灭 ; extinction ; 岩石学 ; petrology
• 页码：p.175-184
• 图表：5 illus., 48 refs.
• 分类号：1200
• issnNo：ISSN1671-9727
• isbnNo：CN51-1634/N

In the upper Yangzte region, laminated limestone, thin-bedded pelmicrite, argillaceous limestones are widely covered by storm-generated brecciform limestone, anachronistic flat-pebble conglomerate calcirudyte, hummocky cross-bedding grain limestone or siltstone. The petrologic change from laminated sediments to grain limestone and calcirudyte indicates that the palaeo-oceanographical environment of the coastal shelf area in Tethys has changed significantly. The petrology features suggest that the limestone is rich in mud and lack of which can reflect the exposed shallow water sedimentary structures and that the laminated limestone and thin bedded limestone are the products of low energy and formed at deep water, indicating the quiet and stagnant marine environments. oft-com:office:office" />