【摘要】 老挝万象盆地钾镁盐矿主要富集在塔贡组下段膏盐中,主要由石盐岩、光卤石、钾石盐、含光卤石钾石盐及少量溢晶石等组成,属单层结构类型。钾镁盐矿中的微量元素Br、Rb和氯化物有直接的关系,是在万象盆地内找钾的直接标志,可在不同程度上反映原始盐溶液的浓缩发展过程。而Sr、B地球化学性质稳定,随卤水浓度的增高而富集在卤液中,可间接指示含钾的层位。证实了万象盆地的卤水来源于南部呵叻盆地,并有地表水体及深部卤水补给的可能性。研究万象盆地元素的地球化学特征,对丰富古代固体钾盐成矿理论、指导兰坪-思茅盆地蒸发岩研究及找钾工作具有重要的指示意义。更多还原

【Abstract】 Potassium and magnesium salt deposit mainly enriches in the lower gypsum rock salt segment of Tagong Formation in Vientiane basin, Laos. The deposit is mainly composed of salt rock, carnallite, potassium salt, carnallite bearing potassium and a small amount of spar etc, and it belongs to single-layer structure. Trace elements of potassium and magnesium salt deposit such as Br and Rb are directly related to chloride, and therefore work as sign of potassium deposit prospecting in the Vientiane basin. These elements can reflected the development process of the original concentration of salt solution in certain degree. Sr and B with stable geochemical nature concentrate in the brine solution with the increase of brine concentration, so they may be indicative for potassium layer. It is confirm that the Vientiane basin brine comes from the southern Khorat basin by the analysis of trace elements, and it’s possible that there is also surface water from deep fracture brine supply. This conclusion can be quite helpful to enrich the ancient solid potassium salt mineralization theory and to guide the research of Lanping-Simao basin evaporite salt and other potash deposits prospecting.更多还原