The thermal properties of hydrothermally altered andesites from La Soufrière de Guadeloupe (Eastern Caribbean)

Heap, Michael; Jessop, David; Wadsworth, Fabian B.; Rosas‐Carbajal, Marina; Komorowski, Jean‐Christophe; Gilg, H. Albert; Aron, Nadège; Buscetti, Margaux; Gential, Laura; Goupil, Margaux; Masson, M.; Hervieu, Lucie; Kushnir, Alexandra; Baud, Patrick; Carbillet, Lucille; Ryan, Amy G.; Moretti, Roberto

doi:10.1016/j.jvolgeores.2021.107444

Cited by 17 publications

(34 citation statements)

References 93 publications

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“…Water-rock interaction processes were also deduced following the behavior of halogens, which presented similar relative concentrations in host rocks [60] and condensates (i.e., higher concentrations of Cl and I compared to Br), suggesting incipient isochemical dissolution. This behavior was expected at La Soufriere volcano, where water-rock exchanges producing extensive hydrothermal alteration have already been recognized [11,42,53,55,64,66,67].…”

Section: Major and Trace Element Concentrations In Gas Condensate Sam...mentioning

confidence: 60%

Monitoring Hydrothermal Activity Using Major and Trace Elements in Low-Temperature Fumarolic Condensates: The Case of La Soufriere de Guadeloupe Volcano

et al. 2022

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At the hydrothermal stage, volcanoes are affected by internal and external processes that control their fumarolic and eruptive activity. Monitoring hydrothermal activity is challenging given the diverse nature of the processes accounting for deeper magmatic and shallow hydrothermal sources. A better understanding of these processes has commonly been achieved by combining geochemical and geophysical techniques. However, existing geochemical techniques only include the surveillance of major gas components in fumarolic emissions or major ions in cold/thermal springs. This work presents a long-term (2017–2021) surveillance of major and trace elements in fumarolic condensates from the Cratère Sud vent, a low-temperature steam-rich emission from the La Soufriere de Guadeloupe volcano. This fumarole presented a fluctuating performance, offering a unique opportunity to reveal the behavior of major and trace elements, as well as the physicochemical processes affecting magmatic and hydrothermal sources. Time-series analyses allowed for the identification of pH-related chemical fluctuations associated with (1) variable inputs of deep magmatic components at the root of the hydrothermal system, (2) pressurization episodes of the hydrothermal system with increasing fluid–rock interaction, acid gas scrubbing, and vapor scavenging of metals, and (3) the decreased hydrothermal activity, decreasing scrubbing efficiency. Variations in the volatile content (e.g., S, Sb, B, Cl, Bi, Zn, Mo, Br, Cd, Ag, Cu, and Pb), the amount of leached rock-related elements (e.g., Na, Mg, Al, Si, P, K, Ca, Ti, Cr, Mn, Fe, Rb, Sr, Y, Cs, Ba, REEs, and U), and variations in the concentration of Cl and S alone, are postulated as key parameters to monitor volcanic–hydrothermal systems in unrest, such as La Soufriere. Our results demonstrate that monitoring using condensates is a useful geochemical technique, complementing conventional methods, such as “Giggenbach” soda flasks or the so-called Multigas.

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Section: Major and Trace Element Concentrations In Gas Condensate Sam...mentioning

confidence: 60%

Monitoring Hydrothermal Activity Using Major and Trace Elements in Low-Temperature Fumarolic Condensates: The Case of La Soufriere de Guadeloupe Volcano

et al. 2022

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“…Experimental studies have provided values for the thermal properties of volcanic rocks for modelling (Horai et al, 1970;Fujii and Osako, 1973;Robertson and Peck, 1974;Bagdassarov and Dingwell, 1994;Whittington et al, 2009;Romine et al, 2012;Mielke et al, 2015Mielke et al, , 2016Mielke et al, , 2017Vélez et al, 2018;Heap et al, 2020;Weydt et al, 2021;Heap et al, 2022a). These studies, and others, have shown that porosity plays a first-order role in dictating thermal properties of volcanic rocks.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the thermal diffusivity of rhyolite decreased from ~2.0 to ~0.7 mm 2 •s −1 as temperature was increased from ~260 to ~850 K (Whittington et al, 2009). The thermal conductivity of andesite from Ruapehu (New Zealand) with a porosity of ~0.3 was increased from ~0.8 to ~1.3 W•m −1 •K −1 upon complete saturation with water (Heap et al, 2020), and hydrothermal alteration has been shown to either increase or decrease the thermal properties of volcanic rocks, depending on whether the alteration was manifest as (1) dissolution and/or replacement or (2) the precipitation of minerals within the void space within the rock (Heap et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

“…McCombie et al (2017) found that the thermal conductivity of pozzolana from Rome (Italy) increased from ~0.2 to ~1.2 W•m −1 •K −1 as the saturation degree increased from dry to fully saturated. The thermal conductivity, thermal diffusivity, and specific heat capacity of dry unlithified volcanic deposits from the lava dome at La Soufrière de Guadeloupe (Eastern Caribbean) were measured to be 0.15−0.20 W•m −1 •K −1 , 0.17−0.24 mm 2 •s −1 , and 0.68−1.04 J•kg −1 •K −1 , respectively (Heap et al, 2022a). The average dry and watersaturated thermal conductivity of volcanic soils from Hokkaido (Japan) was measured to be 0.14 and 0.52 (Tarnawski et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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The thermal conductivity of unlithified granular volcanic materials: The influence of hydrothermal alteration and degree of water saturation

Heap

Wadsworth

Jessop

2023

Journal of Volcanology and Geothermal Research

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“…alteration mineral). Data for H30 and H32 were published inHeap et al (2022b). All other data were published inHeap et al (2021a).…”

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Whole-rock oxygen isotope ratios as a proxy for the strength and stiffness of hydrothermally altered volcanic rocks

et al. 2022

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Hydrothermal alteration is considered to increase the likelihood of dome or flank collapse by compromising stability. Understanding how such alteration influences rock properties, and providing independent metrics for alteration that can be used to estimate these parameters, is therefore important to better assess volcanic hazards and mitigate risk. We explore the possibility of using whole-rock δ 18 O and δD values and water contents, metrics that can potentially track alteration, to estimate the strength (compressive and tensile) and Young's modulus (i.e. "stiffness") of altered (acid-sulfate) volcanic rocks from La Soufrière de Guadeloupe (Eastern Caribbean). The δ 18 O values range from 5.8 to 13.2‰, δD values from -151 to -44‰, and water content from 0.3 to 5.1 wt%. We find that there is a good correlation between δ 18 O values and laboratory-measured strength and Young's modulus, but that these parameters do not vary systematically with δD or water content (likely due to their pre-treatment at 200 °C). Empirical linear relationships that allow strength and Young's modulus to be estimated using δ 18 O values are provided using our new data and published data for Merapi volcano (Indonesia). Our study highlights that δ 18 O values can be used to estimate the strength and Young's modulus of volcanic rocks, and could therefore be used to provide parameters for volcano stability modelling. One advantage of this technique is that δ 18 O only requires a small amount of material, and can therefore provide rock property estimates in scenarios where material is limited, such as borehole cuttings or when sampling large blocks is impracticable.

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The thermal properties of hydrothermally altered andesites from La Soufrière de Guadeloupe (Eastern Caribbean)

Cited by 17 publications

References 93 publications

Monitoring Hydrothermal Activity Using Major and Trace Elements in Low-Temperature Fumarolic Condensates: The Case of La Soufriere de Guadeloupe Volcano

Monitoring Hydrothermal Activity Using Major and Trace Elements in Low-Temperature Fumarolic Condensates: The Case of La Soufriere de Guadeloupe Volcano

The thermal conductivity of unlithified granular volcanic materials: The influence of hydrothermal alteration and degree of water saturation

Whole-rock oxygen isotope ratios as a proxy for the strength and stiffness of hydrothermally altered volcanic rocks

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