摘要
文章通过对四川盆地海相三叠纪蒸发岩硫同位素δ34S组成特征的对比分析,针对该区域三叠系δ34S具有异常高值并且呈现随时间由早到晚逐渐轻化的特点,结合其沉积地质背景、物化条件,特别是对复杂条件下同位素分馏、地质地球化学特征的研究,对硬石膏的δ34S异常高值和随蒸发而逐渐贫化的地质成因进行了探讨,旨在为重建古环境及地层的划分和对比提供重要依据。研究表明,硬石膏中δ34S异常高值的产生主要是处在封闭环境、硫酸盐细菌还原时的同位素分馏作用的结果。
By the comparative analysis on sulfur isotopes （i. e, δ^34S）with the characteristics of the marine Triassic evaporite in Sichuan Basin,for the Triassic δ^34S with the features of abnormal high values and presents gradually lighter from day to night in the region, combined the background of its deposition geological physical-chemical conditions, particularly the study on isotope fractionation, geological and geochemical characteristics under complex conditions, δ^34S abnormal high values of the anhydrite and the geological causes of its gradual poverty with evaporation are discussed, which aimed at providing an important basis for the reconslruction of ancient environment, the division and comparison of stratum. It is shown that δ^34S abnormal high values of the anhydrite mainly due to the isotope fractionating effects in a closed environment and when sulfate was reduced by bacteria.
出处
《四川理工学院学报（自然科学版）》
CAS
2010年第2期238-241,248,共5页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
关键词
硫同位素
δ34S值
同位素分馏
沉积环境
蒸发岩
sulfur isotopes
δ^34S value
isotope fractionation
sedimentary environment
evaporite
