扬子地台震旦纪／寒武纪过渡时期环境变迁

This research project aimed at studying variations and evolution of the depositional facies during the terminal Neoproterozoic and Early Cambrian on the Yangtze Platform, South China. Sedimentary successions across the entire time interval have been well preserved and are exposed throughout a large area. During past 3 years, fieldworks have been carried out in the areas over 8 provinces, more than 30 sections have been investigated. The results indicated that facies variations across the Yangtze platform range from extreme shallow water settings characterized by carbonates, phosphorites and evaporates to the deeper water environments with black shales and cherts. A high-resolution stratigraphy of this interval was established and was applied to subdivide and correlate various statigraphic sequences. An earliest fauna colonized in deep-water environments has been discovered. Some problematic animals have been studied, such as medusiform fossils, chancelloriids, phosphatic tubes, and their phylogenetic affinities have been discussed. A new paleoenvironmental and taphonomic stories of the Chengjiang Fauna was presented. The project provided basic information for integrated investigations of biological and environmental processes of the "Cambrian Explosion" of the Yangtze Platform. .Under the support of this project, we published 36 papers and edited 2 thematic volumes, and organized 3 international symposiums. 5 graduated students and more 30 colleagues both from domestic and foreign institutes have involved the project. .

综合研究扬子地台震旦纪--寒武纪过渡时期海平面升降，层序地层古地理，碳、锶稳定同位素异常和海洋生物量变化。火山与海底热泉喷发事件对古气候、海洋化学、营养状况和大气圈CO2/O2变化的影响。开展全球古气候、环境变化的沉积地质对比研究。这对探讨地球环境突变与生物演化和成矿作用关系，重新确定全球前寒武系/寒武系界线层型和点位具重要意濉?.