摘要
四川盆地海相三叠系地层发育齐全。通过盆地海相三叠系各层段众多的硫酸盐( 石膏、硬石膏) 和盐卤水硫同位素分析样的系统整理和研究,可见同一层段的硫同位素(δ34S)组成稳定,而沿剖面由下而上δ34S呈阶梯状递减轻化趋势,与已知全球海相三叠硫酸盐δ34S的研究的结果有明显差异,这对全球海相三叠系硫酸盐δ34S的研究是一个重要的补充和贡献。对地层划分对比、盐卤水产层和成因、蒸发岩形成环境、咸化发展方向及成钾预测等方面的研究,也有重要意义。
Marine Triassic System was completely developed in Sichuan basin Sulfur isotope compositions for sulfate(gypsum and anhydrite)from the marine Triassic System indicate that δ 34 S values for the same bed (member)are stable,while δ 34 S values on a profile decrease in ascending order This differs from change in δ 34 S values for marine sulfate of the Triassic in the world This is of great importance to stratigraphic division and correlation,occurrance and origin of brine,diagenetic environment of evaporite and K-mineralization prediction
出处
《四川地质学报》
1999年第4期302-307,共6页
Acta Geologica Sichuan
关键词
硫同位素组成
地质意义
三叠纪海水
sulphur isotope composition,geological significance,Triassic sea-water,Sichuan basin