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Artículo

Soil CO2 flux baseline in Planchón – Peteroa Volcanic Complex, Southern Andes, Argentina

Lamberti, María Clara IsabelIcon ; Agusto, Mariano RobertoIcon ; Llano, JoaquinIcon ; Nogués, Victoria; Venturi, Stefania; Velez, Maria LauraIcon ; Albite, Juan ManuelIcon ; Yiries, Jazmín; Chiodini, Giovanni; Cardellini, Carlo; Tassi, Franco; García, Sebastián; Nuñez, Nicolás; Sánchez, Hernán; Gómez, Martín
Fecha de publicación: 10/2020
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Vulcanología

Resumen

The Planchón – Peteroa Volcanic Complex exhibits two active degassing areas: Peteroa crater, PC, and peripheral hydrothermal areas, analyzed in three sampling sites, namely Valle Baños del Azufre, VBA, Valle del Peñón, VP and Valle Valenzuela, VZ. This prospective study was designed to investigate the soil diffuse emissions of CO2 at this volcanic complex. The survey consisted of 560 measurements of CO2 soil diffuse flux and temperature carried out at PC, VBA, VP. The results of this work show that diffuse CO2 is emitted at PC through two well-defined diffuse degassing structures and flux distribution that can be modeled by combining two log-normal populations. Here, the main source of soil CO2 is a shallow aquifer recharged by steam condensation and meteoric fluids that interact with rising magmatic gases. The carbon isotopic signature reveals that CO2 diffuse degassing is affected by secondary soil processes during its ascent. The total diffuse CO2 output at the surveyed area of PC, which covers ̴77,000 m2 around the crater fumarolic field, is 6.49 ± 0.32 t d−1. Soil diffuse emissions at the hydrothermal peripheral sites, VBA and VP, were studied covering a total area of ̴590,000 m2. These emissions are characterized by poorly defined diffuse degassing structures and flux distributions that can be modeled by combining three log-normal populations, which suggest that multiple sources feed CO2 diffuse emissions. In concordance, the isotopic analysis also suggests a mixed source of CO2 and degassing affected by secondary processes that modify the original isotope composition. CO2 soil degassing at VZ shows a clear relation with the vegetated areas of the soil. The minimum endogenous CO2 output estimation here proposed for the Planchón – Peteroa Volcanic Complex is that of PC, ̴6.5 t d−1. The thermal energy release was computed for PC, and the estimation is 2.57 ± 0.53 MW.
Palabras clave: CO2 DIFFUSE DEGASSING , PETEROA VOLCANIC COMPLEX , PLANCHÓN , SOURCES , THERMAL ENERGY RATE
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/121208
URL: https://linkinghub.elsevier.com/retrieve/pii/S0895981120304739
DOI: http://dx.doi.org/10.1016/j.jsames.2020.102930
Colecciones
Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Citación
Lamberti, María Clara Isabel; Agusto, Mariano Roberto; Llano, Joaquin; Nogués, Victoria; Venturi, Stefania; et al.; Soil CO2 flux baseline in Planchón – Peteroa Volcanic Complex, Southern Andes, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 10-2020; 1-12
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