An Integrated Geochemical Spatial and Temporal Survey of Low Temperature Thermal Springs to Characterize the Geothermal Resource of a Volcano (piton Des Neiges, Réunion Island)

We thank Stefan Finsterle and Nicolas Spycher for guiding us with the use of the iGeoT program, and Jonas Greve and Victor K/Bidi for their participation in the fieldwork. We also thank the ' Etablissement thermal de Cilaos for giving us access to their facilities and resources. The Ph.D. fellowship of B. Be ' nard was funded by Le Conseil Re ' gional de La Re ' union. This research has been supported by INSU-CNRS (project "STEAMRUN") and OSU-Re ' union (project "HYDROTHERM") grants, by BRGM, by EDENA, and by IPGP multidisciplinary program PARI and Paris-IdF region SESAME (Grant no. 12015908) . capacity of two newly introduced extraction Chromatographic materials, referred to as Sr.Spec and TRU.Spec, respectively. These afford a straightforward separation of Sr and Sm + Nd with high yield, good purity and satisfactory blank levels, on very small (0.25 ml) columns using small volumes of solutions of a single mineral acid, HNO3. The validity of the method is illustrated by the measurement of 87Sr/ 86Sr and 143Nd/144Nd ratios in twelve international standard reference materials.