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据珊瑚礁类型,南海中沙群岛实为一现代海面以下12—20m的环礁.中沙环礁作NE-SW向,长73浬,宽37浬,泻湖深度为75—85m.其造礁珊瑚有16个属.环礁沉积相可分为4个带:即礁前带、珊瑚生长带、礁核带以及礁后(泻湖)带.礁岩厚度超于2000m.
According to the coral reef type, the Zhongsha Archipelago in the South China Sea is actually a 12-20m atolls below the modern sea surface. The NE-SW at Zhongsha atoll is 73 长 in length and 37 宽 in width with a depth of 75-85m in the lagoon. There are 16 genera.The atolls sedimentary facies can be divided into four zones: pre-reef zone, coral growth zone, reef nuclear zone and reef (lagoon) zone.The reef thickness exceeds 2000m.