Soil degassing at the Los Humeros geothermal field (Mexico)

Peiffer, Loïc; Carrasco-Núñez, Gerardo; Mazot, A.; Villanueva-Estrada, Ruth Esther; Inguaggiato, Claudio; Bernard-Romero, Rubén; Miller, Roberto Rocha; Rojas, Javier Hernández

doi:10.1016/j.jvolgeores.2018.03.001

Cited by 24 publications

(20 citation statements)

References 51 publications

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“…Additionally, most δ 13 CCO2 samples acquired in this study confirm this observation by heavier δ 13 CCO2 values < -10‰. Figure 6 illustrates the relation between CO2 efflux and corresponding carbon isotopic composition in context to previously published carbon isotopic data from Los Humeros (Truesdell and Quijano 1988;González-Partida et al, 1993;Portugal et al 1994;Peiffer et al, 2018;Richard et al, 2019).…”

Section: Population Asupporting

confidence: 84%

“…In fact, maximum CO2 efflux values reported for biogenic sources generally range from below detection limit of the device up to a few tens of grams per square meter and day in highly vegetated areas, but never exceed 100 g m -2 d -1 (Chiodini et al, 2007;Raich and Tufekcioglu, 2000;Widén and Majdi, 2011). Peiffer et al (2018) report similar results for areas without any apparent geothermal manifestations in the Los Humeros caldera with a mean of 7.4 g m -2 d -1 . The overall vegetation within the survey area is very sparse and dominated by shrubs and dry grasses growing on loose soil consisting of pumice tuff mixed with organic material.…”

Section: Population Amentioning

confidence: 63%

“…The total CO2 output (biogenous plus endogenous) is estimated to be 87.6 t d -1 , whereas the CO2 output calculated above the biogenic threshold only accounts for 26.1 t d -1 . A detailed summary of results from all areas is given in Table 4, which also includes CO2 degassing rates computed by Peiffer et al (2018). It is noteworthy that their results are based on random and dense sampling points concentrating on known high degassing areas in Los Humeros.…”

Section: Co2 Output Estimationsmentioning

confidence: 99%

“…Summary of CO2 output estimations from the large-scale and small-scale surveys at Los Humeros. For comparison we included values from the study ofPeiffer et al (2018) as well as other volcanic/geothermal systems worldwide.…”

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confidence: 99%

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Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico

Jentsch

Jolie

Jones

et al. 2020

Journal of Volcanology and Geothermal Research

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Magmatic volatiles can be considered as the surface fingerprint of active volcanic systems, both during periods of quiescent and eruptive volcanic activity. The spatial variability of gas emissions at Earth's surface is a proxy for structural discontinuities in the subsurface of volcanic systems. We conducted extensive and regular spaced soil gas surveys within the Los Humeros geothermal field to improve the understanding of the structural control on fluid flow. Surveys at different scales were performed with the aim to i) identify areas of increased gas emissions (reservoir scale), ii) their relation to (un)known volcano-tectonic structures (fault scale) favoring fluid flow, and iii) determine the origin of gas emissions. Herein, we show results from a CO2 efflux scouting survey, which was performed across the main geothermal production zone (6 km x 4 km) together with soil temperature measurements. We identified five areas with increased CO2 emissions, where further sampling was performed with denser sampling grids to understand the fault zone architecture and local variations in gas emissions. CO2 efflux values range from below detection limit of the device to 1,464 g m -2 d -1 with a total output of 87 t d -1 across an area of 13.7 km 2 . Furthermore, δ 13 CCO2 and 3 He/ 4 He analyses complemented the dataset in order to assess the origin of soil gases. Carbon isotopic data cover a broad spectrum from biogenous to endogenous sources. Determined 3 He/ 4 He ratios indicate a mantle component in the samples of up to 65 % being most evident in the northwestern and southwestern part of the study area. We show that a systematic sampling approach on reservoir scale is necessary for the identification and assessment of major permeable fault segments. The combined processing of CO2 efflux and δ 13 CCO2 facilitated the detection of permeable structural segments with a connection to the deep, high-temperature geothermal reservoir, also in areas with low to intermediate CO2 emissions. The results of this study complement existing geophysical datasets and define further promising areas for future exploration activities in the north-and southwestern sector of the production field.

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Section: Population Asupporting

confidence: 84%

Section: Population Amentioning

confidence: 63%

Section: Co2 Output Estimationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico

Jentsch

Jolie

Jones

et al. 2020

Journal of Volcanology and Geothermal Research

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“…The measurements of diffuse fluxes of CO 2 and CH 4 from soils and lakes in volcanic-hydrothermal systems are useful application to: (i) evaluate the budget of gases from different sources (total fluxes), (ii) monitor volcanic activity, (iii) understand the geological structure settings at local scale and (iv) estimate the energy released from the system (e.g. Allard et al, 1991;Giammanco et al, 1998;Chiodini et al, 2001;Hernández et al 2001;Notsu et al, 2005;Mazot and Taran, 2009;Granieri et al, 2010;Burton et al, 2013;Italiano et al, 2014;Inguaggiato et al, 2012aInguaggiato et al, , 2012bInguaggiato et al, , 2013Inguaggiato et al, 2017aInguaggiato et al, , 2017bJácome-Paz et al, 2019;Peiffer et al, 2018). Among all these studies there are specific efforts to quantify the total global CO 2 released by subaerial volcanism, presenting the first global values of CO 2 flux from 79 to 65 Mt y −1 (Gerlach and Graber, 1985;Williams et al, 1992) to the last calculus of 300, 540 Mt y −1 of CO 2 flux (Mörner and Etiope, 2002;Burton et al, 2013;Fisher, 2019 in that order).…”

Section: Introductionmentioning

confidence: 99%

Total CO2 output and carbon origin discharged from Rincón de Parangueo Maar (México)

Paz

Inguaggiato

Levresse

et al. 2020

Journal of Geochemical Exploration

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A geochemical survey was carried out (May 2016) in the Rincón de Parangueo maar in Valle de Santiago, México. The challenge was to measure CO 2 and CH 4 fluxes discharged from soil and to investigate the chemical and isotopic compositions of interstitial soil gases and remaining vents at the bottom of maars system subjected to critical and high rate drawdown aquifer. Total CO 2 flux calculated by sequential Gaussian simulation is 10.6 ton d −1 (± 2.1 ton d −1) over the entire crater maar area. Two degassing groups were recognized: Group A (background degassing) with values lower than 10 g m −2 d −1 (40% of the total measurements) and Group B with values ranging between 10 and 347.1 g m −2 d −1 (60% of the total amount of measurements). CH 4 flux ranges from 2.1 to 1577 g m −2 d −1. CH 4 /CO 2 flux mean ratio is~20.51 while CH 4 /CO 2 concentration ratios are 78 and 119 for bubbling gases and 8.4 for interstitial gases. The δ 13 C-CH 4 values are~65 per mil vs V-PDB indicating a biogenic origin of methane in bubbling and interstitial gases. The δ 13 C-CO 2 values, ranging from −10.6 to −27.6 and −1.9 per mil vs V-PDB for bubbling gases and the interstitial gases, respectively, suggest secondary CO 2 consumption within the soil.

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Organic compounds in surface and groundwaters in the surrounding of a Mexican geothermal reservoir; case study Los Humeros, Puebla

García-Sánchez

Vara-Castro

Kretzschmar

et al. 2022

Applied Geochemistry

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Soil degassing at the Los Humeros geothermal field (Mexico)

Cited by 24 publications

References 51 publications

Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico

Magmatic volatiles to assess permeable volcano-tectonic structures in the Los Humeros geothermal field, Mexico

Total CO2 output and carbon origin discharged from Rincón de Parangueo Maar (México)

Organic compounds in surface and groundwaters in the surrounding of a Mexican geothermal reservoir; case study Los Humeros, Puebla

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