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artículo

Origins and fluxes of gas emissions from the Central Volcanic Zone of the Andes

Publicado por
de Moor, J. Maarten, Barry, Peter H., Rodríguez, Alejandro, Aguilera, Felipe, Aguilera, Mauricio, González, Cristóbal, Layana, Susana, Chiodi, Agostina L., Apaza Choquehuayta, Fredy Erlingtton, Masías Alvarez, Pablo Jorge, Kern, Christoph, Barnes, Jaime D., Cullen, Jeffrey T., Bastoni, Deborah, Bastianoni, Alessia Benedicta, Cascone, Martina, Jimenez, Christofer, Salas Navarro, Jessica, Ramírez, Carlos J., Jessen, Gerdhard L., Giovannelli, Donato, Lloyd, Karen G.

Publicado 2025

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We present geochemical data from gas samples from ~1200 km of arc in the Central Volcanic Zone of the Andes (CVZA), the volcanic arc with the thickest (~70 km) continental crust globally. The primary goals of this study are to characterize and understand how magmatic gases interact with hydrothermal systems, assess the origins of the major gas species, and constrain gas emission rates. To this end, we use gas chemistry, isotope compositions of H, O, He, C, and S, and SO2 fluxes from the CVZA. Gas and isotope ratios (CO2/ST, CO2/CH4, H2O/ST, δ13C, δ34S, 3He/4He) vary dramatically as magmatic gases are progressively affected by hydrothermal processes, reflecting removal and crustal sequestration of reactive species (e.g., S) and addition of less reactive meteoric and crustal components (e.g., He). The observed variations are similar in magnitude to those expected during the magmatic reac...

artículo

Carbon, nitrogen, and noble gas isotopes reveal deep volatile signatures in thermal springs in the Central Volcanic Zone (CVZ) of the Andes

Publicado por
Barry, Peter H., de Moor, J. Maarten, Broadley, Michael W., Seltzer, Alan M., Bekaert, David V., Patil, K., Bartels, C. G.E., Young, Edward D., Longworth, Brett E., Barosa, Bernardo, Bastianoni, Alessia Benedicta, Bastoni, Deborah, Cascone, Martina, Turner, Stephen J., Tyne, Rebecca L., Anderson, Molly K., Li, Kan, Curtice, Joshua M., Kumar, Naveen, Jessen, Gerdhard L., Blamey, Jenny M., Ramírez, Carlos J., Chiodi, Agostina L., Aguilera, Felipe A., Layana, Susana, González, Cristóbal, Aguilera, Moisés A., Masías Alvarez, Pablo Jorge, Marty, Bernard, Lloyd, Karen G., Giovannelli, Donato

Publicado 2025

Enlace

In subduction zones, thermal springs release deeply-sourced volatiles from Earth's mantle, crust, and/or subducted slab-derived material. The origin and apparent ages of these volatiles are important for understanding the deep volatile cycle, which in turn affects the distribution of microbial life in the subsurface. Here, we report carbon (13C, 14C), noble gas (He, Ne, Ar, Kr and Xe), and clumped nitrogen isotope data in gas and water samples from thermal springs within the Central Volcanic Zone (CVZ) of the Andean Convergent Margin (ACM). He isotopes show that CVZ gases are predominantly sourced from the crust (∼77 %), with smaller mantle contributions (∼23 %), consistent with previous studies from the CVZ. Thermal spring samples with non-atmospheric He-Ne characteristics have low 14C activities, and are deeply derived (i.e., from the mantle and crust) and old (>22,000 years). To g...