【摘要】 <正> 1978年以来,作者在海南岛和西沙群岛进行了20余条现代珊瑚礁剖面的现场测量和调查,潜水深度一般小于10米,个别剖面达25米。综合野外室内资料,归纳出海南岛和西沙群岛现代珊瑚礁沉积模式。本文在叙述各相带的水动力条件、地貌形态、生物分布等沉积环境的同时,着重于沉积物和沉积岩特征的探讨。更多还原

【Abstract】 On the basis of investigation of modern coral reefs of Hainan and Xisha Isl-ands of China,fundamental sedimentary facies of these regions have been iden-tified,and the diagnostic criteria for the discrimination of various reef facies areproposed.From the fore- to the back-reefs,the sedimentary facies zones can besbdivided as follows:the epeiric sea sand-mud facies,the fore-reef colluvial fa-cies,the protogenous reef facies,the marginal reef conglomeratic facies,thereef flat sandy-conglomeratic facies,the sand cay(barrier)conglomerate-sandyfacies and the lagoonal sand-mud facies.The differences between various types ofcoral reefs are in relation with the associations and the distribution of these se-dimentary facies.It has been realized that submarine relief is the main factor indetermining the patterns and sizes of the sedimentary facies zones.The sediments of coral reefs in the area of the Pacific-Indian Oceans are predo-minatly composed of the algal debris,and yet sediments of coral reefs in theSouth China Sea are predominatly composed of Petraiidae.更多还原