四川宣达盐盆富钾富矿卤水地球化学特征及资源意义研究

Study on the Geochemical Characteristics and Resource Significance of the HighlyMineralized Potassium-rich Brine in the Sichuan Xuanda Salt Basin

中文关键词:  富钾富矿卤水  地球化学特征  宣达盐盆  地质条件  古气候

英文关键词:Highly mineralized potassium-rich brine,Geochemical characteristics,Xuanda Salt Basin,T_1J~5-T_2L~1 salt system,Composite formation mechanism,Resource significance

中文摘要:

      宣达盐盆富钾富矿卤水产于四川盆地东北部黄金口背斜群南段付家山构造近高点，以深层卤水形式赋存于3260m左右的下三叠统嘉陵江组五段和中统雷口坡组一段(T1J^5-T2L^1)盐系的碳酸盐岩储层中。卤水与海水蒸发系列相比，K^ 含量异常高，达25．96g/L，超过海水钾盐沉积阶段，也超过综合利用和单独开采品位，为国内外罕见的液态钾矿资源。且富含I^-，B^3 ，Li^ ，Rb^ ，Sr^2 等多种有用组分，品质优异，构成优质化工原料水，为一种综合性富钾富矿液态矿藏，经济价值极高。卤水为沉积变质水和固态钾盐溶滤水的复合成因。开发利用将可为农业提供优质钾肥，缓解我国钾盐资源不足，并可提供多种短缺的化工产品，对固态钾盐找矿具有重要现实意义。

英文摘要:

      The highly mineralized potassium-rich brine of Xuanda Salt Basin originates from the Fujiashan structure of south anticline of the Golden Pass in the northeast of the Sichuan Basin. It is located, in the form of deep water, in the carbonate layer of the T_1J~5-T_2L~l salt system at a depth of 3260 meters. Compared with the concentration series of seawater, the brine contains extraordinarily high amount of potassium ions, i.e., 25.96 g/L, which exceeds the amount in the seawater at the stage of potassium sedimentation, as well as the quality for comprehensive or singular utilization. Therefore,it is a liquid potassium resource of rarity both domestically and abroad. The brine also contains rich amount of other utilizable components, such as I~-, B~(3+), Li~+, Rb~+ and Sr~(2+), with fine qualities, which,together with potassium, upgrade it as a superb liquid for chemical exploitation, with tremendous economical significance. The brine is of the composite formation mechanism of sedimentary transformation and the dissolution and filtration of solid potassium salts. The exploitation and utilization of the brine would provide potassium fertilizer to agriculture, to relieve the deficiency of domestic potassium resources, as well as some chemical products of shortage. In addition, it is of good significance for the exploration of solid potassium minerals.