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微亮晶碳酸盐岩是一种发育在前寒武纪尤其是元古代的特殊类型碳酸盐岩,它在结构上与基质有明显区别,是由均一、等轴、多边形的微亮晶方解石组成,个体为5～15μm。安徽灵璧地区微亮晶碳酸盐岩按其成因可分为原地和异地两类。原地微亮晶主要分布于泥晶灰岩、粉屑泥晶灰岩、泥灰岩或泥岩中;异地微亮晶主要发育在粉屑灰岩或砾屑灰岩中。微亮晶碳酸盐岩的岩石学特征指示其形成并发育于稳定克拉通浅海潮下及环潮坪环境,特别是中浅缓坡向上变浅旋回的底部,风暴浪基面是其发育的最大深度。微亮晶碳酸盐岩作为一种具有全球性意义的沉积碳酸盐岩类,具有特定的时限分布范围,这对于提高前寒武纪地层对比精度具有重要意义。
Micelite carbonates are a special type of carbonate rocks developed in the Precambrian, especially the Proterozoic. They are structurally distinct from the matrix and consist of uniform, equiaxed, polygonal spherules Calcite composition, the individual is 5 ~ 15μm. Micro-sparge carbonate rocks in Lingbi area of Anhui Province can be divided into two types according to their causes, both in situ and in different places. In situ micro-spherulites are mainly distributed in the muddy limestone, powder crumb limestone, marl or mudstone; off-site micro-spherulite is mainly developed in the duststone or gravel limestone. The petrological characteristics of micro-sparling carbonate rocks indicate that they formed and developed at the bottom of the stable cratonic shallow tidal flat and the tidal flat environment, especially at the mid-shallow gentle slope upwards. The surface of storm waves is the largest depth. Micro-sparling carbonate rocks, as a type of sedimentary carbonate rocks of global significance, have a specific range of time distribution, which is of great significance for improving the contrast accuracy of Precambrian strata.