Integrating Stable Isotopes with Mean Residence Time Estimation to Characterize Groundwater Circulation in a Metamorphic Geothermal Field in Yilan, Taiwan

This paper presents a water circulation model by combing oxygen and hydrogen stable isotopes and mean residence time (MRT) estimation in a high-temperature metamorphic geothermal field, Tuchen, in Yilan, Taiwan. A total of 18 months of oxygen and hydrogen stable isotopes of surface water and thermal water show the same variation pattern, heavier values in summer and lighter values in the rest of the year. A shift of delta O-18 with a relative constant delta D indicates the slow fluid-rock interaction process in the study area. Two adjacent watersheds, the Tianguer River and Duowang River, exhibit different isotopic values and imply different recharge altitudes. The seasonal variation enabled us to use stable isotope to estimate mean residence time of groundwater in the study area. Two wells, 160 m and 2200 m deep, were used to estimate mean residence time of the groundwater. Deep circulation recharges from higher elevations, with lighter isotopic values, 5.9 parts per thousand and 64 parts per thousand of delta O-18 and delta D, and a longer mean residence time, 1148 days, while the shallow circulation comes from another source with heavier values, 5.7 parts per thousand and 54.4 parts per thousand of delta O-18 and delta D, and a shorter mean residence time, 150 days. A two-circulation model was established based on temporal and spatial distribution characteristics of stable isotopes and the assistance of MRT. This study demonstrates the usefulness of the combined usage for further understanding water circulation of other various temperatures of metamorphic geothermalfields.

Automated summary

This paper presents a water circulation model in a high-temperature metamorphic geothermal field in Taiwan. The study combines oxygen and hydrogen stable isotopes and mean residence time estimation to analyze the variation patterns and estimate the mean residence time of groundwater. The results show that there are two circulation systems with different recharge altitudes and isotopic values. The study demonstrates the usefulness of the combined usage of stable isotopes and MRT in understanding water circulation in different temperature geothermal fields.