滇东埃迪卡拉(震旦)系顶部旧城段多样宏体化石群的发现  

Discovery of diverse macrofossil assemblages from the Jiucheng Member of uppermost Ediacaran in eastern Yunnan

作　　者：唐烽[1] 尹崇玉[1] 刘鹏举[1] 王自强[2] 高林志[1] 

机构地区：[1]中国地质科学院地质研究所 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《古地理学报》2007年第5期533-540,共8页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(40272015;40672022);中国地质调查局工作项目(1212010511607)联合资助

摘　　要：在中国云南东部晋宁、江川地区的埃迪卡拉(震旦)系顶部灯影组旧城段,新发现了多样的宏体化石群,其中除了丰富的Vendotaenia与Tyrasotaenia类化石以外,以形体较大的Tawuia类和Longfengshaniaceae科等具固着构造的底栖多细胞藻类化石占据优势,另有一些形态奇特、亲缘关系不明的宏体化石,该组合与华南陡山沱组和灯影组石板滩段的宏体化石组合存在着明显的差别。依据形态特征,概述了部分产自江川旧城段的具有不同类型固着构造的底栖藻类和归属不明的宏体化石特征。滇东地区旧城段形态多样的宏体藻类化石的发现,进一步表明埃迪卡拉纪末期存在后生植物的多样化发展。这一时期浮游微生物和后生植物的共同繁盛可能为早寒武世"澄江生物群"的爆发奠定了生态基础。A highly diversified macrofossil assemblage the uppermost Ediacaran of Jinning and Jiangchuan areas in was discovered from the Jiucheng Member of eastern Yunnan. In addition to abundant Vendotaenia and Tyrasotaenia, large muhicellular benthos such as Tawuia-like and Longfengshaniaceae fossils with diverse holdfast structures, have a distinct dominance, while there are still some other macrofossils with peculiar configurations as well as indistinct relatives. There is an obvious distinction between this assemblage and the macrofossil assemblages from the Doushantuo Formation and the Shibantan Member of the Dengying Formation in South China. This paper has outlined the characteristics of some of the muhicellular fossils from the Jiucheng Member at Jiangchuan. They include some macrofossils with different types of holdfast structures, and indistinct affinities as well. The discovery of the diverse-shaped macrofossil assemblages from the Jiucheng Member in eastern Yunnan indicates the diversification and radiation of metaphytes during the latest Ediacaran Period. The contemporary radiations of phytoplankton and benthic metaphyte probably made a significant contribution to the Early Cambrian explosion of animals.

关 键 词：滇东地区 埃迪卡拉(震旦)系 旧城段 宏体化石组合 

分 类 号：Q915.81[天文地球—古生物学与地层学]