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于1994—1995年间，在云南保山盆地第三系地层采集泥岩样品，用中子活化分析方法和化学分析方法测定了泥岩的微量元素和氧化物含量；用X－射线衍射（XRD）分析和扫描电镜（SEM）分析方法测试了泥岩的粘土矿物成分和含量；应用科奇和亚当斯理论计算了湖盆古盐度。结果表明，该湖盆羊四段盐度最高达15.70，羊三段盐度为12．79,羊一段盐度为13．35，南林组盐度为13．26。随着沉积介质盐度的增大，微量元素硼（B）、相当硼含量逐渐增大，Sr／Ba，B／Ga比值也逐渐增加，它们之间呈线性正相关关系。
Mud samples were collected from the Tertiary strata of Baoshan Mountain in Yunnan Province during 1994-1995. The trace elements and oxide contents of mudstone were determined by neutron activation analysis and chemical analysis. X-ray diffraction (XRD) and scanning The composition and content of clay minerals in mudstone were tested by SEM. The ancient salinity of the lake basin was calculated by using the theory of Coch and Adams. The results showed that the salinity of the fourth member of the lake was 15.70, that of the third member of sheep was 12.79, that of the first member of the sheep was 13.35 and that of the Nanlin Formation was 13.26. With the increase of salinity, the content of trace boron (B) and equivalent boron increased gradually, while the ratio of Sr / Ba and B / Ga increased gradually. There was a linear positive correlation between them.