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系统采集不同沉积相区和连续沉积的剖面,即浅海台地相广西柳江龙殿山剖面、台缘缓坡相云南施甸鱼硐剖面和台内盆地相广西柳州碰冲剖面,运用数理统计方法,研究了华南岩关—大塘界线过渡期牙形石的产出丰度和相分布,在恢复生物演化序列的基础上,对各剖面首先详细分带,再进一步综合成系统的5个牙形石带,即Gnathodustypicus-G.cuneiformis带、Gnathodustypicus-Protognathoduscordiformis带、Scaliognathusanchoralis-Gnathoduspseu-dosemiglaber带、Gnathoduspraebilineatus带和Paragnathodushomopunctatus带。以生物系统发生为标准,严格限定各带的界线,并与北美、西欧同期地层进行精确对比,为建立杜内阶—维宪阶界线的全球层型(GSSP)提供可靠依据。
The system collects sedimentary facies and continuous sedimentary profiles, ie, the Longhai Mountain section of Liujiang in Guangxi Province on the shallow sea plateau, the Shidian aqueduct profile of the Yunnan margin of the platform margin and the collision area of Liuzhou in Guangxi Province in the Tai Wan basin. Using mathematical statistics, On the basis of restoring the sequence of the biological evolution, the profiles of the southern China’s Iwabe-Daitang boundary transitional period are detailedly zoned, and then further integrated into 5 systematic types of conodont zones Gnathodustypicus-G.cuneiformis, Gnathodustypicus-Protognathoduscordiformis, Scaliognathus anchoralis-Gnathoduspseu-dosemiglaber, Gnathoduspraebilineatus and Paragnathodushomopunctatus. With the occurrence of biological system as the standard, the boundaries of each zone are strictly defined and compared accurately with the same period of North America and Western Europe to provide a reliable basis for establishing the global layer type (GSSP) of the Dune-Vysehir boundary.