@article{fdi:010088127,
  title = {{A}n integrated geochemical spatial and temporal survey of thermal springs to characterize the geothermal resource of a volcano ({P}iton des {N}eiges, {R}{\'e}union {I}sland)},
  author = {{B}enard, {B}. and {F}amin, {V}. and {S}anjuan, {B}. and {V}imeux, {F}ran{\c{c}}oise and {A}unay, {B}. and {A}grinier, {P}. and {L}ebeau, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{G}eothermal exploration can be challenging in the absence of obvious surface indicators of a high enthalpy geothermal resource such as geysers, fumaroles or thermal springs with temperatures near 100°{C} {T}his is the case at the {P}iton des {N}eiges volcano ({R}{\'e}union {I}sland), which displays evidence of hydrothermal activity mostly as thermal springs with temperatures not exceeding 50 °{C}, affected by mixing and reequilibration, and emerging in a complex geological framework, resulting from the polygenic history of this dormant volcano. {Y}et, these thermal springs keep a partial record of the reservoir geochemistry. {H}ere, we propose an exploration method to set this thermal signature apart from the contribution of other processes and trace back the equilibrium conditions, enabling us to locate thermal fluid circulations, and evaluate their temperature and availability. {W}e report its application at {P}iton des {N}eiges volcano. {W}e led an extensive geochemical survey which nearly doubled the number of thermal springs reported on the volcano and dramatically extended the existing geochemical database in space and time. {I}n tandem, we also monitored ?18{O} and ?{D} values in rainwaters and thermal springs over two years to compare their temporal variations.



{O}ur surveys show that the repartition of thermal springs is controlled by only one of the volcanic rift zones (the {N}30°{E} axis), which is thus identified as the heat source of hydrothermal circulations. {T}his {N}30°{E} rift zone is also a preferential pathway for the degassing of mantellic {CO}2. {I}n addition, the composition of thermal waters is influenced by syenite intrusions along the rim of the caldera, acting as drains for the uprise of hydrothermal waters. {O}, {H} and {S}r isotopic signatures of springs show that the geothermal resource of {P}iton des {N}eiges is in fact made of two independent and unconnected hydrothermal systems on the northern and southern circular depressions of the volcano (the cirques of {S}alazie and {C}ilaos, respectively).  ...},
  keywords = {{C}hromatography ; {E}xtraction ; {S}amarium ; {S}trontium ; {N}eodymium ; {REUNION}},
  booktitle = {},
  journal = {{A}pplied {G}eochemistry},
  volume = {154},
  numero = {},
  pages = {105689 [17 ]},
  ISSN = {0883-2927},
  year = {2023},
  DOI = {10.1016/j.apgeochem.2023.105689},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088127},
}