青海察尔汗盐湖别勒滩区段晶间卤水全氮地球化学分布特征

Total Nitrogen Distribution Geochemical Characteristics of Intercrystal Brine in Bieletan Section of Qarhan Salt Lake

氮是反映盐湖组成及盐湖环境的一个特征元素,全氮对于研究盐湖生物和有机地球化学具有重要意义。通过对察尔汗盐湖别勒滩区段晶间卤水全氮含量的分析,发现晶间卤水中全氮的含量相对海水、湖水等水体较高,全氮在不同钻孔不同深度上变化较大、随深度增加出现变大、变小和无变化3种变化趋势。空间上靠近涩聂湖和小别勒湖的钻孔中氮含量较低,可能与湖水补给有关。对比该地区卤水的矿化度、主要离子等指标发现,全氮受主要离子及矿化度的影响不大。同时结合盐湖晶间卤水中氨基酸的测试结果,发现全氮与氨基酸具有一定的相关性,表明在柴达木盆地别勒滩区段,全氮指标具有一定的有机地球化学指示意义。

Nitrogen is a characteristic element that reflects the components and formation environment of salt lakes.The research of the total nitrogen content is highly significant in studying the salt lake organism and organic geochemical.By determinating the total nitrogen content of inter- crystal brine in Bieletan,Qarhan Salt Lake,and comparing with salt lake salinity,eight common inorganic ions content in the region,it was found that there are different spatial distribution regularities between the total nitrogen and other inorganic elements like potassium,lithium and calcium.Total nitrogen content is less regular between different drill holes as well as the same drill hole with different depth.Besides,the variation of total nitrogen content is far bigger than those ions.There are three trends that the brine nitrogen content becomes larger,smaller and invariant with increasing depth,and the nitrogen content of drill holes which near Senie Lake and Xiaobiele Lake are lower than other areas.The variation of total nitrogen content of inter- crystal brine in the region is not so influenced by factors such as common inorganic ion and degree of mineralization,and the real influence factors need further analysis and ascertainment.The authors also discovered the nitrogen in the region is higher than in the sea,lakes and natural waters.At the same time,combining with the test result of salt lake inter- crystal brine amino acid,it was found that good correlation between total nitrogen content and amino acids content,suggesting that total nitrogen index has certain organic geochemical denotative meaning in Bieletan Section.