滇西兰坪盆地马登温泉碳酸根同位素组成示踪研究

THE TRACKING STUDIES OF MADENG HOT SPRING CO_2-3 ISOTOPE IN COMPOSITION IN LANPING BASIN,THE WEST OF YUNNAN

在系统测定和分析了兰坪盆地碳酸盐岩地层碳、氧同位素（１３Ｃ、１８Ｏ）组成特征和地层中方解石脉，地下水中碳酸根及泉华碳氧同位素组成特征的基础上，发现方解石脉，地下水碳酸根及泉华碳、氧同位素组成特征与原岩存在相关关系。据此，以马登温泉为例，论证了地下水碳酸根碳，氧同位素作为“示踪剂”确定其补给含水层的可行性。结果是马登温泉的补给含水层为晚三叠世歪古村组碳酸盐岩地层，同时也证实了马登盆地地下存在歪古材组含盐系地层。

Determining and analysing the carbon oxygen isotope (13C、18O) in composition for carbonate rock strata and calcite veins in the rock,groundwater,calcareous tufa in Lanping Basin,we have discovered that the 13C、18O in coposition is relative in rock with in calcite veins,groundwater,calcareous tufa.So,it is possible that we can use the C13、O18 for tracking material and determine the supply layer of Madeng hot spring.The present study has shown that the supply layer of the hot spring is Weigucun Group carbonate rock stratum and the group saline stratum exist below the basin.