关于滩相沉积

滩或滩相是碳酸盐沉积中的重要类型，常见的有生物碎屑滩和鲕粒滩。滩一般包容了坝、脊、洲、丘等沉积体。在认识滩时应力求识别出它的具体产出环境（如沿岸沙坝、潮汐三角洲等）和产出状态（形态、大小、展布等）。从列举的现代和古代鲕粒沉积的典型实例中可以看出它们的复杂性，如鲕粒滩不仅发育在台地边缘，也发育于海岸地带，鲕
粒沉积不仅产出于沙坝，也产于潮汐三角洲、沙脊、沙席、潮坪、舄湖等。

STUDY ON SHOAL FACIES DEPOSIT

The shoal(or bank) and shoal facies are important types of carbonate deposits. The bioclastic shoal and ooid shoal are common in geological history. In general, the shoal (or bank) includes bar, ridge, mound and other sedimentary bodies. The envirnoment and state of shoal should be considered while the shoal is analyzed. Many examples of ancient and modern ooid shoals show its complex natures. For example, the ooid shoal not only developed on platform, margin, but also developed in coast zone, and the ooid deposit not only occurred in bar, but also occurred in tidal delta, ridge, sheet, tidal flat, lagoon, etc.