Chemistry of thermal waters in the arera from Quangnam-danang to Baria-Vungtau, Vietnam

Abstract

The results of previous investigations in Vietnam have revealed a geothermal origin for, and the possible exploitation potential of several springs in Central and South Vietnam. Seventy hot springs were sampled and then twenty-four samples selected for further study with the aim of evaluating and interpreting their chemical composition using methods such as triangular diagrams, plots of log Q/K vs. temperature and mixing models using SiO2 content and heat content. It is indicated that the thermal springs are peripheral waters, except for two (M13 and M14 near Tuwoka) which are mature waters. According to the enthalpies obtained, the hot springs can be divided into two groups, low-enthalpy springs with geothermometer temperatures <125°C and intermediate-enthalpy springs with geothermometer temperatures between 125 and 150°C. The highest temperature predicted for a single hot spring is 144°C (sample M13).