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矿床地质  2010 

老挝东泰钾盐矿床地球化学及其沉积后变化初步研究

Keywords: 地质学,盐体几何形态,微量元素Br和K,Br×1000/Cl系数,沉积后变化,老挝东泰钾盐矿床

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Abstract:

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。

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