Sedimentary System Division and Paleogeographic Evolution of the Early Silurian Shiniulan Formation,Northern Guizhou
The Lower Silurian Shiniulan formation in northern Guizhou is well developed,but the research of this area is weak,in order to further explore the paleogeography and evolution of the lithofacies of this forma-tion,through profile measurement and lithofacies analysis,combined with the comprehensive study of regional geological data,it is shown that the marine sediments and hyperfacies sediments are developed in this formation,including tidal flats,carbonate terraces,shelfies and delta facies types,upward flat,confined platform,open platform,platform marginal reef(beach),argillaceous shelf and mixed shelf,delta front subfacies type,mi-crofacies types of bioreefs,bioshoals,granular shoals,sand bars,and biomounds,marine sedimentation developed south of Daozhen,to the north develops delta front,vertically divided into 4 segments and 2 cycles,the first and third members are composed of calcareous argillaceous rock,marl,and siltstone,the second and fourth members are composed of bioclastic limestone and algal sand-detrisulous limestone,the first and second stages form the first cycle,the third and fourth segments form the second cycle,under the action of paleocontinental uplift and basin extension,an orderly transverse-retreat stratigraphic sequence was recorded.
万方数据
维普
