节点文献
柴达木盆地氯同位素组成特征
CHLORINE ISOTOPIC COMPOSITION IN QAIDAM BASIN
【摘要】 采用正热电离高精度测定Cl同位素的方法对我国柴达木盆地水体及盐类沉积的Cl同位素组成进行了精确测定,结果表明,柴达木盆地Cl同位素组成存在着明显的变化。各种水体的平均δ37Cl值顺序为:河水(0.94‰)>咸水湖水(-0.2‰)>油田水(-0.62‰)>盐湖卤水(-0.97‰)。卤水具有最低的δ37Cl值,这是盐湖卤水蒸发析盐的结果。盐湖卤水与共存盐类矿物间的分馏系数为1.0001-1.0021。来自马海盐湖地区钻孔盐类沉积垂直剖面的δ37Cl值为0.00‰-1.05‰。盐湖卤水的δ37Cl值与卤水的水化学类型、pH值、密度、Cl的浓度以及Cl的物质来源有关,因此,盐湖卤水的Cl同位素组成研究将成为盐湖形成演化环境和盐湖物质来源研究方面新的重要手段。
【Abstract】 The chlorine isotopic composition of brine, saline water,fresh water,oil-field water and salt deposite in the Qaidam Basin have been examined with high precision by the Cs2Cl+ positive ionization mass spectrometry. The results indicate that chlorine isotope of the Qaidam Basin have evident fractionation. The averageδ37Cl value from different water system are as follows: fresh water(0.94‰) > saline water(0.2‰)> oil-field water-0.82‰)> brine(-0.97‰). Brine has the lowestδ37Cl value as a result of brine evaporation and saline miner.al precipitation in salt lakes. Fractionation factor between halite and brine is from 1.0001 to 1.0021. The δ37Cl value for vertical profile of salt deposits from the Mahai drill hole is from 0.00‰to 1.05‰. Theδ37Cl value of the brine from salt lake is a function of the type of water chemistry,the pH value, the density,the chlorine content and the chlorine isotopic fractionation of brine, Therefore, the chlorine isotopic composition of brine will become an importent means to trace the material origin and evolution condition of salt lakes.
- 【文献出处】 地球化学 ,GEOCHIMICA , 编辑部邮箱 ,1996年03期
- 【分类号】P578.32
- 【被引频次】30
- 【下载频次】288