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昌都地区发育有大量的膏盐、白云石及菱镁矿,研究其区域成钾潜力意义重大。在对昌都盆地蒸发岩矿点实地考察过程中,共采集12个盐泉水样及2个泉水样。通过常微量元素及水化学特征系数研究,查明研究区盐泉水水化学类型为氯化物型和硫酸钠亚型,属于岩盐溶滤成因,溶滤了大量的石盐和少量的碳酸盐岩及硫酸盐岩,纳西盐井盐泉水同时还受深部循环水的影响。昌都地区盐泉水样中Na、Cl含量及矿化度由北向南逐渐降低,Br、Li、B含量较低,整体上呈现以贡觉为中心,向北、向南逐渐增高的变化趋势。研究区盐泉水具有内陆盐湖性质,北部含盐地层更具海相成因特征,盆地由北至南从海相沉积环境逐渐过渡为内陆海沉积环境,受陆表水影响愈大。研究表明,类乌齐含盐地层经历了最强烈的浓缩蒸发及岩盐溶滤作用,其浓缩阶段晚于纳西及贡觉含盐带,其成钾潜力同样也优于纳西及贡觉含盐带,可作为钾盐矿异常点。贡觉和纳西含盐地层在不同程度上受到了陆表水的影响。综合对比前人研究成果,发现囊谦—昌都—兰坪盆地自北向南,成钾潜力逐渐变优。
The development of a large number of gypsum salt, dolomite and magnesite in Qamdo area is of great significance in studying the potential of potassium in the area. During the field investigation of the evaporation rock deposits in the Qamdo Basin, a total of 12 salt spring water samples and 2 spring water samples were collected. Through the study of trace elements and chemical characteristic coefficients of water, it was found that the chemical type of salt spring water in the study area is chloride type and sodium sulfate subtype, belonging to the cause of rock salt leaching and filtration, filtering a large amount of rock salt and a small amount of carbonate rock And sulfate rock, Naxi saline salt spring water is also affected by deep circulating water. The content of Na and Cl and the salinity of salt spring water in the Qamdo area gradually decrease from north to south, and the contents of Br, Li and B are relatively low, showing a trend of increasing northward and southward on the whole. The salt spring water in the study area has inland salt lake properties. The salt-bearing strata in the northern part of the study area are more marine-originally characterized. The basin gradually transitions from the marine sedimentary environment to the inland sea sedimentary environment from north to south, and is more affected by surface water. The study shows that the Wu-Uzi salt strata experienced the strongest concentration evaporation and rock salt leaching, and its enrichment stage is later than that of the Naxi and Gongjue salt strata, and its potassium-forming potentiality is also superior to that of the Naxi and Gongjue strata , Can be used as anomalous point of potassium salt mine. Gongjue and Naxi salt formations are affected to varying degrees by surface water. According to the results of previous studies, it is found that the Potassium Potential becomes gradually better from the north to the south of the Baoqian-Qamdo-Lanping basin.