碳酸盐颗粒成岩变化的实验研究

引言碳酸盐岩是沉积岩中非常重要的岩石类型。近二十年来,碳酸盐岩的成岩作用是国际上讨论得最热烈的问题之一。不同的人根据各自的观察和研究,对碳酸盐岩的成因提出了许多不同的模式。福克(Folk,1959)等人,根据当时研究得比较深入的碎屑岩的沉积原理认为,碳酸盐岩不是纯化学形成的,而是与碎屑岩碎屑的机械沉积方式相同,是一定的水动力条件的产物。据此,提出了以异化颗粒和泥晶灰泥为两个端元组分对碳酸盐岩进行结构分类。这一研究成果对于碳酸盐岩的研究起了巨大的推动作用。近二十年来,大多数研究者大都是基于福克的分类原则来划分碳酸盐岩的岩石类型,并据此来推断它们的沉积环境。在地质实践过程中发现,以异化颗粒和泥晶灰泥为两个端元组分来划分岩石.

EXPERIMENT STUDY OF DIAGENETIC VARIATION OF MODERN CARBONATE GRAINS

Based ox the diageaetic experiment of the modern carbonate sand sampled from Xisha Archipelago, this paper studis is detail the diageaetic changes of the tea- ture, construction and mineral composition of carbonate is higher temperature and higher pressure. The results of the experiment show that the sand grains of carbo- ante are micritized is three ways during the diageaetic process:(1) fractured micri- tizatioa, under higher pressure coarse carbonate grains are fractured into fine micri- tic grains with closely mosaic texture.