广西泥盆纪四射珊瑚的分布与组合特征

广西早泥盆世晚期至晚泥盆世的碳酸盐台地区发育有两个不同的四射珊瑚群落,此二群落都有其各具特点的珊瑚组合系列。其中,在开阔台地相区的四射珊瑚可划分为9个组合带,而在台地边缘相区则可划分为8个组合带。在早泥盆世早、中期,因岩相分异不明显,四射珊瑚仅可划分为3个组合带。因此证明,四射珊瑚的发展演化与沉积相演变有密切的关系。

THE DISTRIBUTION AND ASSEMBLAGE OF DEVONIAN TETRACORALLA IN GUANGXI

Two diffrerent faunas of Tetracoralla, each of which is characterized by its individual coral assemblages, developed in the carbonate platform in Guangxi during late Early to Late Devonian Time. The Tetracoralla in the open carbonate platform can be grouped into nine assemblage zones, whereas those in the marginal fades of the platform eight assemblage zones. The Tetracoralla developing during early Early to Middle Devonian Time can only be grouped into three assemblage zones as a result of insignificant differentiation of lithofacies. This study shows that a close relation exists between the evolution of Tetracoralla and the development of sedimentary facies.