An integrated geochemical spatial and temporal survey of thermal springs to characterize the geothermal resource of a volcano (Piton des Neiges, R′eunion 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.

Automated summary

We would like to express our gratitude to Stefan Finsterle and Nicolas Spycher for their guidance on using the iGeoT program, and to Jonas Greve and Victor K/Bidi for their involvement in the fieldwork. Special thanks to the Etablissement thermal de Cilaos for granting us access to their facilities and resources. The research was supported by various grants from INSU-CNRS, OSU-Re'union, BRGM, EDENA, IPGP, and Paris-IdF region SESAME (Grant no. 12015908).