滇中昆阳群大龙口组碳酸盐岩特征及沉积环境标志的初步分折

Characteristics of Carbonate Rocks and Their Sedimentary Environments in the Dalongkou Formation,Kunyang Group,Central Yunnan

Regional Geological Survey Party, Yunnan Bureau of Geology and Mineral Resources

摘要: 碳酸盐岩的环境分析,近年来正广泛展开,尤其在古生代及以后的碳酸盐岩中,相继建立有不少标准型沉积环境(相)模式。对前寒武纪碳酸盐岩的环境(相)研究则较为落后,故有关的标准环境(相)模式较少。

Abstract: On the basis of the occurrences of stratified carbonate—algal stromatolites and their associations with primary red algae, in combination with the data on lithostratigraphic sections in the Yuxi and Eshan districts as well as the representative literatures on the carbonate rocks in the Middle Proterozoic Dalongkou Formation of the Kunyang Group in central Yunnan, the diagenetic environments of the carbonate sediments in the Dalongkou Formation may be divided into the subtidal low-energy zone in the platform facies region, the subtidal high-energy zone in the platform margin facies region and the subtidal low-energy zone in the inner shelf facies region.