Decoding water-rock interaction and volatile input at La Soufriere volcano (Guadeloupe) using time-series major and trace element analyses in gas condensates

• Published in: Journal of Volcanology and Geothermal Research
• Main Authors: Inostroza, Manuel, Moune, Séverine, Moretti, Roberto, Bonifacie, Magali, Robert, Vincent, Burtin, Arnaud, Chilin-Eusebe, Elodie
• Other Authors: Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire Magmas et Volcans (LMV-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-SPIN-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS), Observatoire Volcanologique et Sismologique de Guadeloupe (OVSG), Institut de Physique du Globe de Paris (IPG Paris), Laboratoire Magmas et Volcans (LMV), EU-funded project IMMERGE (Impact multi-environnemental des retombées volcaniques et sahariennes en Guadeloupe), European funding (FEDER FSE PO 2014-2020), Région Guadeloupe funding (agreement GP0023419), ANR-18-IDEX-0001,Université de Paris,Université de Paris(2018)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: Trace elements; Hydrothermal systems; La Soufriere volcano; Water-rock interaction; Aerosols; [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology; [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; New Zealand; White Island
• Online Access: https://hal.science/hal-03609802; https://doi.org/10.1016/j.jvolgeores.2022.107517

International audience The geochemical behavior of major and trace elements in fumarolic gas condensate samples collected between April 2017 and January 2021 was investigated at La Soufriere hydrothermal volcano. Samples collected from Cratère Sud and Napoleon Nord fumaroles (temperature varying from 93.9 to 108.4 °C) offer a unique opportunity to reveal the physicochemical processes that affect the deeper magmatic and shallow hydrothermal systems feeding fumaroles. Gas condensate samples exhibit abundant solid particles that suggest strong water-rock interaction and erosive processes in fumarolic conduits at La Soufriere. These particles were incorporated during sampling, except for rare Si-rich spherules that appeared to have precipitated during storage time. Gas condensate samples displayed abundant concentrations of S, halogens (Cl, Br, I), metals/metalloids (B, Ni, Cu, Zn, As, Mo, Ag, Cd, Sb, Pb, and Bi), as well as enhanced concentrations of rock-related lithophile and siderophile elements. The relative abundance of major and trace elements in gas condensates suggests the permanent contribution of volatile-rich magmatic fluids and strong water-rock interaction processes. Based on elemental correlations and the physical properties of chemical elements, it is postulated that most of them are discharged in the aerosol phase, except for the halogens and S, which can be found in the gaseous phase in low-temperature fumarolic emissions. Metals and metalloids (Sb, Bi, Zn, Mo, Ni, Ag, Cd, As, and Pb) enriched in gas condensates were transported within tiny aqueous droplets, while rock-related elements (including REEs) were transported in the aerosol phase. Trace element enrichments in La Soufriere's condensates are comparable with those found in worldwide magmatic-hydrothermal systems such as Kawaj Ijen (Indonesia), Lastarria (Chile), and White Island (New Zealand) volcanoes. The size of the hydrothermal system and the degree of water-rock interaction are thought to be important parameters in controlling the ...