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呵叻高原是世界上最大的钾盐沉积矿床分布区之一,研究区位于呵叻高原北部的沙空那空盆地东部边缘,钻探资料揭示该地区钾盐资源相当可观。该含盐建造包含上、中、下3个盐段,每个盐段都由一套蒸发岩-碎屑沉积旋回组成,钾盐层主要赋存于下盐段上部。剖面和地层学分析表明,研究区盐构造类型为低结构低成熟度的盐背斜构造,盐体几何形态为一低结构低成熟度的盐背斜,盐背斜轴部矿层厚度较两翼矿层厚得多。岩盐中微量元素Br、K含量及Br×1000/Cl系数的变化指示成盐卤水经过了阶段性的浓缩和淡化过程,并且成盐作用越来越弱。ZK04孔较低的Br含量〔w(Br)=18×10-6〕表明下膏盐层在成盐过程中受到了非海相流体的影响。中膏盐层基底石盐中高K低Br特征表明,下膏盐层残余高浓度卤水影响了其成盐过程,并且该基底石盐很可能又经历了溶解和重结晶过程。
The Korat Plateau is one of the largest deposits of potash deposits in the world. The study area is located on the eastern edge of the Sha-Nami basin in the northern part of the Korat Plateau. Drilling data reveal considerable reserves of potash resources in the area. The salt formation consists of three salt sections above, middle and lower. Each salt section consists of a series of evaporite-clastic sedimentary cycles, and the potassium salt layer mainly occurs in the upper part of the lower salt section. The profile and stratigraphic analysis show that the salt structural types in the study area are low-structure and low-maturity salt-anticline structures, the salt geometry is a low-structure and low-maturity salt anticline, and the thickness of the salt anticline shaft is thicker than the two-wing ore layer Much thicker. The contents of trace elements Br, K and Br × 1000 / Cl in rock salt indicate that the salt brine has been phased and desalinated step by step, and the salt formation is weaker and weaker. The lower Br content of ZK04 (w (Br) = 18 × 10-6) indicates that the lower gypsum salt layer is affected by the non-marine fluid during salt formation. The characteristics of high K and low Br in the base salt of the gypsum salt layer indicate that the residual high concentration of brine in the gypsum salt layer affects its salinization process, and the base salt probably undergoes dissolution and recrystallization processes.