A. Aiuppa, D. R. Baker, and J. D. Webster, Halogens in volcanic systems, Chemical Geology, vol.263, issue.1-4, pp.1-18, 2009.
DOI : 10.1016/j.chemgeo.2008.10.005

T. Altheide, V. Chevrier, C. Nicholson, and J. Denson, Experimental investigation of the stability and evaporation of sulfate and chloride brines on Mars, Earth and Planetary Science Letters, vol.282, issue.1-4, pp.69-78, 2009.
DOI : 10.1016/j.epsl.2009.03.002

G. Azimi and V. G. Papangelakis, Mechanism and kinetics of gypsum???anhydrite transformation in aqueous electrolyte solutions, Hydrometallurgy, vol.108, issue.1-2, pp.122-129, 2011.
DOI : 10.1016/j.hydromet.2011.03.007

G. Azimi, V. G. Papangelakis, and J. E. Dutrizac, Modelling of calcium sulphate solubility in concentrated multi-component sulphate solutions, Fluid Phase Equilibria, vol.260, issue.2, pp.300-315, 2007.
DOI : 10.1016/j.fluid.2007.07.069

J. D. Barnes and Z. D. Sharp, Chlorine Isotope Geochemistry, Reviews in Mineralogy and Geochemistry, vol.82, issue.1, pp.345-378, 2017.
DOI : 10.2138/rmg.2017.82.9

J. Bell, H. Mcsween, J. Crisp, R. Morris, S. Murchie et al., Mineralogic and compositional properties of Martian soil and dust: Results from Mars Pathfinder, Journal of Geophysical Research: Planets, vol.103, issue.E1, pp.1721-1755, 2000.
DOI : 10.1029/98JE00739
URL : http://onlinelibrary.wiley.com/doi/10.1029/1999JE001060/pdf

J. J. Bellucci, M. J. Whitehouse, T. John, A. A. Nemchin, J. F. Snape et al., Halogen and Cl isotopic systematics in Martian phosphates: Implications for the Cl cycle and surface halogen reservoirs on Mars, Earth and Planetary Science Letters, vol.458, pp.192-202, 2017.
DOI : 10.1016/j.epsl.2016.10.028

G. W. Brass, Stability of brines on Mars, Icarus, vol.42, issue.1, pp.20-28, 1980.
DOI : 10.1016/0019-1035(80)90237-7

J. C. Bridges and S. P. Schwenzer, The nakhlite hydrothermal brine on Mars, Earth and Planetary Science Letters, vol.359, issue.360, pp.359-360, 2012.
DOI : 10.1016/j.epsl.2012.09.044

B. Capaccioni, D. Rouwet, and F. Tassi, HCl degassing from extremely acidic crater lakes: preliminary results from experimental determinations and implications for geochemical monitoring, Geological Society, London, Special Publications, vol.72, issue.1, 2016.
DOI : 10.1007/s00445-009-0332-4
URL : https://flore.unifi.it/bitstream/2158/1089380/1/Capaccioni%20HCl%20GSL%202016.pdf

C. Caudron, R. Campion, D. Rouwet, T. Lecocq, B. Capaccioni et al., Stratification at the Earth's largest hyperacidic lake and its consequences, Earth and Planetary Science Letters, vol.459, pp.28-35, 2017.
DOI : 10.1016/j.epsl.2016.11.002

V. F. Chevrier and T. S. Altheide, Low temperature aqueous ferric sulfate solutions on the surface of Mars, Geophysical Research Letters, vol.240, issue.E6, pp.10-1029, 2008.
DOI : 10.1029/2008GL035489
URL : http://onlinelibrary.wiley.com/doi/10.1029/2008GL035489/pdf

B. W. Christenson and C. P. Wood, Evolution of a vent-hosted hydrothermal system beneath Ruapehu Crater Lake, New Zealand, Bulletin of Volcanology, vol.3, issue.6, pp.547-565, 1993.
DOI : 10.1080/00288306.1979.10424215

B. C. Clark, V. Hart, and D. C. , The salts of Mars, Icarus, vol.45, issue.2, pp.370-378, 1981.
DOI : 10.1016/0019-1035(81)90041-5

B. C. Clark, R. V. Morris, S. M. Mclennan, R. Gellert, B. Jolliff et al., Chemistry and mineralogy of outcrops at Meridiani Planum, Earth and Planetary Science Letters, vol.240, issue.1, pp.73-94, 2005.
DOI : 10.1016/j.epsl.2005.09.040

M. Czarnacki and S. Halas, Isotopes in Environmental and Health Studies, vol.43, issue.1, pp.55-64, 2012.
DOI : 10.2138/gsrmg.43.1.1

P. Delmelle and A. Bernard, Geochemistry, mineralogy, and chemical modeling of the acid crater lake of Kawah Ijen Volcano, Indonesia, Geochimica et Cosmochimica Acta, vol.58, issue.11, pp.2445-2460, 1994.
DOI : 10.1016/0016-7037(94)90023-X

P. Delmelle, A. Bernard, M. Kusakabe, T. P. Fischer, and B. Takano, Geochemistry of the magmatic???hydrothermal system of Kawah Ijen volcano, East Java, Indonesia, Journal of Volcanology and Geothermal Research, vol.97, issue.1-4, pp.31-53, 2000.
DOI : 10.1016/S0377-0273(99)00158-4

H. G. Eggenkamp, The Geochemistry of chlorine isotopes, 1994.

A. Elsenousy, J. Hanley, and V. F. Chevrier, Effect of evaporation and freezing on the salt paragenesis and habitability of brines at the Phoenix landing site, Earth and Planetary Science Letters, vol.421, pp.39-46, 2015.
DOI : 10.1016/j.epsl.2015.03.047

H. E. Farrah, G. A. Lawrance, and E. J. Wanless, Gypsum???anhydrite transformation in hot acidic manganese sulfate solution. A comparative kinetic study employing several analytical methods, Hydrometallurgy, vol.75, issue.1-4, pp.91-98, 2004.
DOI : 10.1016/j.hydromet.2004.07.002

K. A. Farley, P. Martin, . P. Archer-jr, S. K. Atreya, P. G. Conrad et al., Light and variable 37 Cl/ 35 Cl ratios in rocks from Gale Crater, Mars: Possible signature of perchlorate, Light and variable 37 Cl/ 35 Cl ratios in rocks from Gale Crater, Mars: Possible signature of perchlorate, pp.14-24, 2016.
DOI : 10.1016/j.epsl.2015.12.013

J. Filiberto, A. H. Treiman, P. A. Giesting, C. A. Goodrich, and J. Gross, High-temperature chlorine-rich fluid in the martian crust: A precursor to habitability, Earth and Planetary Science Letters, vol.401, pp.110-115, 2014.
DOI : 10.1016/j.epsl.2014.06.003

D. Foustoukus, W. E. Seyfried, and . Jr, Fluid Phase Separation Processes in Submarine Hydrothermal Systems, Reviews in Mineralogy and Geochemistry, vol.65, issue.1, pp.213-233, 2007.
DOI : 10.2138/rmg.2007.65.7

M. G. Fox-powell, J. E. Hallsworth, C. R. Cousins, and C. S. Cockell, Ionic Strength Is a Barrier to the Habitability of Mars, Astrobiology, vol.16, issue.6, pp.427-442, 2016.
DOI : 10.1089/ast.2015.1432

D. Freyer and W. Voigt, Crystallization and Phase Stability of CaSO 4 and CaSO 4 - Based Salts, Monatshefte f???r Chemie / Chemical Monthly, vol.134, issue.5, pp.693-719, 2003.
DOI : 10.1007/s00706-003-0590-3

P. Gamazo, S. A. Bea, M. W. Saaltink, J. Carrera, and C. Ayora, Modeling the interaction between evaporation and chemical composition in a natural saline system, Journal of Hydrology, vol.401, issue.3-4, pp.154-164, 2011.
DOI : 10.1016/j.jhydrol.2011.02.018

R. Gellert, R. Rieder, R. Anderson, J. Bruckner, B. Clark et al., Chemistry of Rocks and Soils in Gusev Crater from the Alpha Particle X-ray Spectrometer, Science, vol.305, issue.5685, pp.829-832, 2004.
DOI : 10.1126/science.1099913

R. Gellert, R. Rieder, J. Bruckner, B. Clark, G. Dreibus et al., Alpha Particle X-Ray Spectrometer (APXS): Results from Gusev crater and calibration report, Journal of Geophysical Research: Planets, vol.436, issue.E12, pp.2-05, 2006.
DOI : 10.1038/nature03637
URL : http://onlinelibrary.wiley.com/doi/10.1029/2005JE002555/pdf

W. F. Giggenbach, Variations in the carbon, sulfur and chlorine contents of volcanic gas discharges from White Island, New Zealand, Bulletin Volcanologique, vol.127, issue.1, pp.15-27, 1975.
DOI : 10.1080/00288306.1970.10431329

W. F. Giggenbach, Redox processes governing the chemistry of fumarolic gas discharges from White Island, New Zealand, Applied Geochemistry, vol.2, issue.2, pp.143-161, 1987.
DOI : 10.1016/0883-2927(87)90030-8

E. A. Gorrepati, P. Wongthahan, S. Raha, and F. H. , Silica Precipitation in Acidic Solutions: Mechanism, pH Effect, and Salt Effect, Langmuir, vol.26, issue.13, pp.10467-10474, 2010.
DOI : 10.1021/la904685x

I. Gunnarsson and S. Arnórsson, Amorphous silica solubility and the thermodynamic properties of H4SiO??4 in the range of 0?? to 350??C at Psat, Geochimica et Cosmochimica Acta, vol.64, issue.13, pp.2295-2307, 2000.
DOI : 10.1016/S0016-7037(99)00426-3

L. A. Hardie, The gypsum?anhydrite equilibrium at one atmosphere, Am. Mineral, vol.52, pp.171-200, 1967.

L. Haskin, A. Wang, B. Jolliff, H. Mcsween, B. Clark et al., Water alteration of rocks and soils on Mars at the Spirit rover site in Gusev crater, Water alteration of rocks and soils on Mars at the Spirit rover site in Gusev crater, pp.66-69, 2005.
DOI : 10.1029/2003JE002061

M. Ichikuni and S. Musha, Partition of strontium between gypsum and solution, Chemical Geology, vol.21, issue.3-4, pp.359-363, 1978.
DOI : 10.1016/0009-2541(78)90055-4

G. Innorta, E. Rabbi, and L. Tomadin, The gypsum-anhydrite equilibrium by solubility measurements, Geochimica et Cosmochimica Acta, vol.44, issue.12, pp.1931-1936, 1980.
DOI : 10.1016/0016-7037(80)90192-1

K. S. Johnson and R. M. Pytkowicz, Ion association of Cl>-) with H>+) , Na>+) ,K>+) , Ca>2+) , and Mg>2+) in aqueous solutions at 25 degrees C, American Journal of Science, vol.278, issue.10, pp.1428-1447, 1978.
DOI : 10.2475/ajs.278.10.1428

R. S. Kaufmann, Chlorine in groundwater: stable isotope distribution, 1984.

K. A. Kempter and G. L. Rowe, Leakage of Active Crater lake brine through the north flank at Rinc??n de la Vieja volcano, northwest Costa Rica, and implications for crater collapse, Journal of Volcanology and Geothermal Research, vol.97, issue.1-4, pp.143-159, 2000.
DOI : 10.1016/S0377-0273(99)00181-X

L. P. Knauth and D. M. Burt, Eutectic Brines on Mars: Origin and Possible Relation to Young Seepage Features, Icarus, vol.158, issue.1, pp.267-271, 2002.
DOI : 10.1006/icar.2002.6866

J. Kushnir, The coprecipitation of strontium, magnesium, sodium, potassium and chloride ions with gypsum. An experimental study, Geochimica et Cosmochimica Acta, vol.44, issue.10, pp.1471-1482, 1980.
DOI : 10.1016/0016-7037(80)90112-X

Z. Li and G. P. Demopoulos, O System between 0 and 100 ??C, Industrial & Engineering Chemistry Research, vol.45, issue.13, pp.4517-4524, 2006.
DOI : 10.1021/ie0600339

L. Li, M. Boniface, C. Aubaud, O. Crispi, C. Déssert et al., Chlorine isotopes of thermal springs in arc volcanoes for tracing shallow magmatic activity, Earth and Planetary Science Letters, vol.413, 2015.
DOI : 10.1016/j.epsl.2014.12.044
URL : https://hal.archives-ouvertes.fr/insu-01451591

. Sci and . Lett, , pp.101-110

A. Liebscher, V. Lüders, C. Heinrich, and . Schettler, Br/Cl signature of hydrothermal fluids: liquid-vapor of bromine revised, pp.113-121, 2006.

M. Liotta, A. L. Rizzo, J. D. Barnes, L. D-'auria, M. Martelli et al., Chlorine isotope composition of volcanic rocks and gases at Stromboli volcano (Aeolian Islands, Italy): Inferences on magmatic degassing prior to 2014 eruption, Journal of Volcanology and Geothermal Research, vol.336, pp.168-178, 2017.
DOI : 10.1016/j.jvolgeores.2017.02.018

Y. Marcus, Ionic dissociation of aqueous hydrobromic acid. Part 1.???Estimate from vapour pressure and activity coefficient data, Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, vol.75, issue.0, pp.1715-1727, 1979.
DOI : 10.1039/f19797501715

W. L. Marshall and J. M. Warakomski, Amorphous silica solubilities???II. Effect of aqueous salt solutions at 25??C, Geochimica et Cosmochimica Acta, vol.44, issue.7, pp.915-924, 1980.
DOI : 10.1016/0016-7037(80)90281-1

M. T. Mellon, W. C. Feldman, and T. H. Prettyman, The presence and stability of ground ice in the southern hemisphere of Mars, Icarus, vol.169, issue.2, pp.324-340, 2004.
DOI : 10.1016/j.icarus.2003.10.022

D. Nordstrom, C. Alpers, C. Ptacek, and D. Blowes, Negative pH and Extremely Acidic Mine Waters from Iron Mountain, California, Environmental Science & Technology, vol.34, issue.2, pp.254-258, 2000.
DOI : 10.1021/es990646v

M. Ossorio, A. E. Van-driessche, P. Pérez, and J. M. García-ruiz, The gypsum???anhydrite paradox revisited, Chemical Geology, vol.386, pp.16-21, 2014.
DOI : 10.1016/j.chemgeo.2014.07.026

A. G. Ostroff, Conversion of gypsum to anhydrite in aqueous salt solutions, Geochimica et Cosmochimica Acta, vol.28, issue.9, pp.1363-1372, 1964.
DOI : 10.1016/0016-7037(64)90154-1

D. L. Parkhurst and C. A. Appelo, User's guide to PHREEQC (Version 2), A computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations, USGS Report, vol.312, pp.99-4259, 1999.

G. B. Pasternack and J. C. Varekamp, Volcanic lake systematics I. Physical constraints, Bulletin of Volcanology, vol.58, issue.7, pp.528-538, 1997.
DOI : 10.1007/s004450050160

K. S. Pitzer and G. Mayorga, Thermodynamics of electrolytes. II. Activity and osmotic coefficients for strong electrolytes with one or both ions univalent, The Journal of Physical Chemistry, vol.77, issue.19, pp.2300-2308, 1973.
DOI : 10.1021/j100638a009

E. Posnjak, The system, CaSO4?H2O, Am. J. Sci, vol.35, pp.247-272, 1938.

E. Posnjak, Deposition of calcium sulfate from sea water, American Journal of Science, vol.238, issue.8, pp.559-568, 1940.
DOI : 10.2475/ajs.238.8.559

A. Rodríguez and M. J. Van-bergen, Abstract, Netherlands Journal of Geosciences, vol.38, issue.370, 2015.
DOI : 10.1007/s11214-012-9948-3

A. Rodríguez and M. J. Van-bergen, Superficial alteration mineralogy in active volcanic systems: An example of Po??s volcano, Costa Rica, Journal of Volcanology and Geothermal Research, vol.346, 2017.
DOI : 10.1016/j.jvolgeores.2017.04.006

A. Rodríguez, H. G. Eggenkamp, M. Martínez-cruz, and M. J. Van-bergen, Chlorine isotope and Cl???Br fractionation in fluids of Po??s volcano (Costa Rica): Insight into an active volcanic???hydrothermal system, Journal of Volcanology and Geothermal Research, vol.325, pp.70-85, 2016.
DOI : 10.1016/j.jvolgeores.2016.05.020

A. Rodríguez, J. C. Varekamp, M. J. Van-bergen, T. J. Kading, P. B. Oonk et al., Acid Rivers and Lakes at Caviahue-Copahue Volcano as Potential Terrestrial Analogues for Aqueous Paleo-Environments on Mars, pp.141-172, 2016.
DOI : 10.1007/978-3-662-48005-2_7

D. Rouwet, T. D. Ohba, . Rouwet, F. Bw-christenson, J. Tassi et al., Isotope Fractionation and HCl Partitioning During Evaporative Degassing from Active Crater Lakes, pp.179-200, 2015.
DOI : 10.1007/978-3-642-36833-2_7

D. Rouwet, F. Tassi, R. Mora-amador, L. Sandri, and V. Chiarini, Past, present and future of volcanic lake monitoring, Journal of Volcanology and Geothermal Research, vol.272, pp.78-97, 2014.
DOI : 10.1016/j.jvolgeores.2013.12.009
URL : https://hal.archives-ouvertes.fr/hal-01892653

D. Rouwet, R. Mora-amador, C. J. Ramírez-umaña, G. González, and S. Inguaggiato, Dynamic fluid recycling at Laguna Caliente (Po??s, Costa Rica) before and during the 2006???ongoing phreatic eruption cycle (2005???10), Geological Society, London, Special Publications, vol.37, issue.236, 2016.
DOI : 10.1130/G25396A

G. L. Rowe, S. L. Brantley, M. Fernández, J. F. Fernández, A. Borgia et al., Fluid-volcano interaction in an active stratovolcano: the crater lake system of Po??s volcano, Costa Rica, Journal of Volcanology and Geothermal Research, vol.49, issue.1-2, pp.23-51, 1992.
DOI : 10.1016/0377-0273(92)90003-V

E. A. Schauble, G. R. Rossman, T. Jr, and H. P. , Theoretical estimates of equilibrium chlorine-isotope fractionations, Geochimica et Cosmochimica Acta, vol.67, issue.17, pp.3267-3281, 2003.
DOI : 10.1016/S0016-7037(02)01375-3

J. H. Seo and Z. Zajacz, Fractionation of Cl/Br during fluid phase separation in magmatic???hydrothermal fluids, Geochimica et Cosmochimica Acta, vol.183, pp.125-137, 2016.
DOI : 10.1016/j.gca.2016.04.009

Z. D. Sharp, J. D. Barnes, T. P. Fischer, and M. Halick, An experimental determination of chlorine isotope fractionation in acid systems and applications to volcanic fumaroles, Geochimica et Cosmochimica Acta, vol.74, issue.1, pp.264-273, 2010.
DOI : 10.1016/j.gca.2009.09.032

Z. D. Sharp, J. Williams, C. Shearer, C. Agee, and K. Mckeegan, The chlorine isotope composition of Martian meteorites 2. Implications for the early solar system and the formation of Mars, Meteoritics & Planetary Science, vol.84, issue.358, pp.2111-2126, 2016.
DOI : 10.1016/0019-1035(90)90050-J

M. E. Schmidt, S. W. Ruff, T. J. Mccoy, W. H. Farrand, J. R. Johnson et al., Hydrothermal origin of halogens at Home Plate, Gusev Crater, Journal of Geophysical Research, vol.113, issue.E12, pp.6-12, 2008.
DOI : 10.1007/978-3-642-74864-6

J. D. Toner, D. C. Catling, and B. Light, Modeling salt precipitation from brines on Mars: Evaporation versus freezing origin for soil salts, Icarus, vol.250, pp.451-461, 2015.
DOI : 10.1016/j.icarus.2014.12.013

N. J. Tosca and S. M. Mclennan, Chemical divides and evaporite assemblages on Mars, Earth and Planetary Science Letters, vol.241, issue.1-2, pp.21-31, 2006.
DOI : 10.1016/j.epsl.2005.10.021

N. J. Tosca and S. M. Mclennan, Experimental constraints on the evaporation of partially oxidized acid-sulfate waters at the martian surface, Geochimica et Cosmochimica Acta, vol.73, issue.4, pp.1205-1222, 2009.
DOI : 10.1016/j.gca.2008.11.015

A. H. Truesdell, J. R. Haizlip, H. Ármannsson, D. 'amore, and F. , Origin and transport of chloride in superheated geothermal steam, Geothermics, vol.18, issue.1-2, pp.295-304, 1989.
DOI : 10.1016/0375-6505(89)90039-4

H. C. Urey and L. J. Greiff, Isotopic Exchange Equilibria, Journal of the American Chemical Society, vol.57, issue.2, pp.3211-327, 1935.
DOI : 10.1021/ja01305a026

V. Van-hinsberg, K. Berlo, M. Van-bergen, W. , and A. , Extreme alteration by hyperacidic brines at Kawah Ijen volcano, East Java, Indonesia: I. Textural and mineralogical imprint, Journal of Volcanology and Geothermal Research, vol.198, issue.1-2, pp.253-263, 2010.
DOI : 10.1016/j.jvolgeores.2010.09.002

J. C. Varekamp, G. B. Pasternack, G. L. Rowe, J. T. Williams, C. K. Shearer et al., Volcanic lake systematics II. Chemical constraints, Journal of Volcanology and Geothermal Research, vol.97, issue.1-4, pp.161-179, 2000.
DOI : 10.1016/S0377-0273(99)00182-1

V. Damm, K. L. Lilley, M. D. Shanks, W. C. Iii, M. Brockington et al., Extraordinary phase separation and segregation in vent fluids from the southern East Pacific Rise, Proskurowski G., and the SouEPR Science Party, pp.365-378, 2003.
DOI : 10.1016/S0012-821X(02)01081-6

J. T. Williams, C. K. Shearer, Z. D. Sharp, P. V. Burger, F. M. Mccubbin et al., The chlorine isotopic composition of Martian meteorites 1: Chlorine isotope composition of Martian mantle and crustal reservoirs and their interactions, Meteoritics & Planetary Science, vol.50, issue.370, pp.2092-2110, 2016.
DOI : 10.1111/maps.12425

Y. A. Morris, R. V. Clark, B. C. Gellert, R. Knudson, A. T. Squyres et al., Hydrothermal processes at Gusev Crater: An evaluation of Paso Robles class soils, J. Geophys. Res, vol.113, p.10, 1029.

M. Y. Zolotov and M. V. Mironenko, Timing of acid weathering on Mars: A kinetic-thermodynamic assessment, Journal of Geophysical Research, vol.32, issue.52, 2007.
DOI : 10.1130/0-8137-2307-8.125

, Notes: (a) total sulphur, measured by ICP-OES; (b) calculated total dissolved solids; (c) the chemical composition of the sample 0