白云化作用的环境标志初步探索

PRELIMINARY APPROACH TO ENVIRONMENTAL INDICATORS OF DOLOMITZATION

陈彦华 孙妥 刘莺

Chen Yanhua Sun Tuo Liu Ying

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Ministry of Geology and Minerals

本文对苏、皖、湘、鄂、川、滇等地的中古生界主要白云岩层段作了各种结构类型白云岩的岩石学、碳、氧稳定同位素和微量元素研究,认识到白云岩的结构是白云化环境的直观反映,而存在于白云石中的碳、氧稳定同位素和微量元素,是了解白云化介质的性质的重要线索。因此,由白云化作用所形成的白云岩的结构特征,碳、氧稳定同位素和微量元素的特征可以作为白云化环境的重要标志。本文还从白云化环境角度对白云岩保存原始碳酸钙组构的条件和原因作了分析。

This paper discusses types of the textures, petrology of dolomite, stable carbon and oxygen isotopic compositions and trace elements of the major members of Meso-Paleozoic dolomite in Jiangsu, Anhui, Hunan, Hubei, Sichuan and Yunnan provinces. Through this study, we came to know that the textures of dolomite can serve as objective sign of the environment of dolomitzation, and stable isotopic compositions of carbon and oxygen and trace elements can throw light on the properties of the medium of dolomitzation. These data can be regarded as important environmental indicators of dolomitzation. This paper also studies conditions and factors for retaining original fabric of calcium carbonate in dolomite from viewpoint of the environment.

https://doi.org/10.11781/sysydz198304276