山东省大汶口盆地蒸发岩地球化学特征及找钾标志

Geochemical Characteristics of Evaporites and Criteria for Potassium Prospecting in Dawenkou Basin of Shandong Province

摘要:

山东省大汶口盆地是我国著名的蒸发岩沉积盆地，盆地内蕴藏有丰富的石膏、岩盐等沉积型矿产。岩盐赋矿地层为古近系官庄群，控矿构造为同生正断层。通过对盆地内岩盐K，Mg等常量元素、δ34S同位素特征以及盆地内盐泉卤水镁氯系数、钠氯系数进行分析，总结出盆地内蒸发岩是在相对封闭、还原的沉积环境下形成的；根据元素特征、镁氯系数及钠氯系数，总结出盆地具备成钾条件并确定找钾标志。

Abstract:

Dawenkou basin in Shandong Province is a famous evaporite sedimentary basin in China. There are abundant types deposition mineral resources, such as gypsum and halite．Halitebearing strata are Paleogene Guanzhuang group，and orecontrolling structures are synsedimentary normal faults. In the basin，through analysis on K, Mg and δ34S isotopic characteristics, magnesium chloride brine coefficient and sodium chloride brine coefficient of salt spring, it is concluded that evaporates in the basin was formed in relatively closed and restoring sedimentary environments. According to characteristics of elements，magnesium chloride coefficient and sodium chloride coefficient，it is regarded that the basin has potassium condition and the criteria for prospecting potassium can be found.