Artículo

Tassi, F.; Aguilera, F.; Benavente, O.; Paonita, A.; Chiodini, G.; Caliro, S.; Agusto, M.; Gutierrez, F.; Capaccioni, B.; Vaselli, O.; Caselli, A.; Saltori, O. "Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s)" (2016) Chemical Geology. 432:41-53
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Abstract:

This study presents the first geochemical data of fluid discharges collected from February 2010 to March 2015 from the Planchón-Peteroa-Azufre Volcanic Complex (PPAVC), located in the Transitional Southern Volcanic Zone (TSVZ) at the border between Argentina and Chile. During the study period, from January 2010 to July 2011, Peteroa volcano experienced phreatic to phreatomagmatic eruption possibly related to the devastating Maule earthquake occurred on February 27, 2010. The compositional dataset includes low temperature (from 43.2 to 102 °C) gas discharges from (i) the summit of Peteroa volcano and (ii) the SE flank of Azufre volcano, both marked by a significant magmatic fluid contribution, as well as bubbling gases located at the foothill of the Peteroa volcanic edifice, which showed a chemical signature typical of hydrothermal fluids. In 2012, strong compositional changes affected the Peteroa gases from the summit area: the acidic gas species, especially SO 2 , increased, suggesting an input of fluids from magma degassing. Nevertheless, the R/Ra and δ 13 C-CO 2 values decreased, which would imply an enhanced contribution from a meteoric-hydrothermal source. In 2014-2015, the chemical and isotopic compositions of the 2010-2011 gases were partially restored. The anomalous decoupling between the chemical and the isotopic parameters was tentatively interpreted as produced by degassing activity from a small batch of dacitic magma that in 2012 masked the compositional signature of the magmatic fluids released from a basaltic magma that dominated the gas chemistry in 2010-2011. This explanation reliably justifies the observed geochemical data, although the mechanisms leading to the change in time of the dominating magmatic fluid source are not clear. At this regard, a geophysical survey able to provide information on the location of the two magma batches could be useful to clarify the possible relationships between the compositional changes that affected the Peteroa fluid discharges and the 2010-2011 eruptive activity. © 2016 Elsevier B.V.

Registro:

Documento: Artículo
Título:Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s)
Autor:Tassi, F.; Aguilera, F.; Benavente, O.; Paonita, A.; Chiodini, G.; Caliro, S.; Agusto, M.; Gutierrez, F.; Capaccioni, B.; Vaselli, O.; Caselli, A.; Saltori, O.
Filiación:Department of Earth Sciences, University of Florence, Via La Pira, 4, Florence, 50121, Italy
Inst. of Geosciences and Earth Resources of the National Research Council (CNR-IGG), Via La Pira, 4, Florence, 50121, Italy
Servicio Nacional de Geología y Minería, Avenida Santa María 0104, Santiago, Chile
Centro de Excelencia en Geotermia (CEGA), Universidad de Chile, Plaza Ercilla 803, Santiago, Chile
Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile
Istituto Nazionale di Geofisica e Vulcanologia, Via U. La Malfa 153, Palermo, 90146, Italy
Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Via Diocleziano, Napoli, Italy
GESVA, IDEAN (UBA-CONICET), Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, 1428EHA, Argentina
Advanced Mining Technology Center (AMTC), Av. Tupper 2007, piso 4, Santiago, Chile
Department of Earth and Geological-Environmental Sciences, Piazza Porta San Donato, 1, Bologna, 40126, Italy
Universidad de Río Negro, General Roca, Argentina
Palabras clave:Andean volcanic chain; Gas geochemistry; Geochemical volcano monitoring; Magmatic degassing; Peteroa volcano; Carbon dioxide; Degassing; Gases; Geochemistry; Geophysics; Isotopes; Sulfur dioxide; Temperature; Chemical signatures; Compositional changes; Gas geochemistry; Hydrothermal fluids; Isotopic composition; Isotopic parameters; Phreatomagmatic eruption; Volcano monitoring; Volcanoes; degassing; fluid composition; hydrothermal fluid; isotopic composition; magma chemistry; monitoring; Argentina; Chile; Peteroa Volcano
Año:2016
Volumen:432
Página de inicio:41
Página de fin:53
DOI: http://dx.doi.org/10.1016/j.chemgeo.2016.04.007
Título revista:Chemical Geology
Título revista abreviado:Chem. Geol.
ISSN:00092541
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092541_v432_n_p41_Tassi

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Citas:

---------- APA ----------
Tassi, F., Aguilera, F., Benavente, O., Paonita, A., Chiodini, G., Caliro, S., Agusto, M.,..., Saltori, O. (2016) . Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s). Chemical Geology, 432, 41-53.
http://dx.doi.org/10.1016/j.chemgeo.2016.04.007
---------- CHICAGO ----------
Tassi, F., Aguilera, F., Benavente, O., Paonita, A., Chiodini, G., Caliro, S., et al. "Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s)" . Chemical Geology 432 (2016) : 41-53.
http://dx.doi.org/10.1016/j.chemgeo.2016.04.007
---------- MLA ----------
Tassi, F., Aguilera, F., Benavente, O., Paonita, A., Chiodini, G., Caliro, S., et al. "Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s)" . Chemical Geology, vol. 432, 2016, pp. 41-53.
http://dx.doi.org/10.1016/j.chemgeo.2016.04.007
---------- VANCOUVER ----------
Tassi, F., Aguilera, F., Benavente, O., Paonita, A., Chiodini, G., Caliro, S., et al. Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010-2015: Insights into compositional changes related to the fluid source region(s). Chem. Geol. 2016;432:41-53.
http://dx.doi.org/10.1016/j.chemgeo.2016.04.007