The chemical and isotopic composition of fumarolic gases and spring discharges from Galeras Volcano, Colombia

Fischer, Tobias P.; Sturchio, Neil C.; Stix, John; Arehart, Greg B.; Counce, D.; Williams, Stanley N.

doi:10.1016/s0377-0273(96)00096-0

Cited by 86 publications

(66 citation statements)

References 47 publications

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“…The observed HCl depletion in plume gas chemistry in 1998 may be explained by the hydrothermal interaction with the volcanic gas emission system. The absorption of acidic volcanic gases into a liquid-dominated hydrothermal environment is observed elsewhere (e.g., Fischer et al, 1996Fischer et al, , 1997Giggenbach et al, 1990). Rowe et al (1992b) reported the possibility of lake water invasion to the adjacent fumarolic conduit at Poas volcano, Costa Rica.…”

Section: Characteristics Of Fumarolic Gas System At Mt Nakadakementioning

confidence: 78%

Temporal variation in chemical composition of the volcanic plume from Aso volcano, Japan, measured by remote FT-IR spectroscopy

Mori

Notsu

2008

Geochem. J.

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Remote measurements of chemical compositions of the Aso volcanic plume using an FT-IR spectral radiometer were carried out at the 1st crater of Mt. Nakadake, Aso volcano, Japan, for six times from 1996 to 2003. We have succeeded in detecting 6 volcanic gas species (SO 2 , HCl, HF, CO, CO 2 , COS) using the InSb detector. The equilibrium temperatures estimated from observed CO/CO 2 ratios have remained high at more than 700°C during the observation period. However, the temporal variation of the ratios between volcanic gas components showed significant scrubbing of HCl compared to other species by hydrothermal interaction in 1998. From the visual and FT-IR observations, we presume that SO 2 flux from the volcano was lower in 1998 than in other years. This decrease in flux was not due to hydrothermal scrubbing of SO 2 but was due to decrease in a total supply rate of gas from depth. This assumption is supported by relatively stable CO 2 /SO 2 ratio which is probably reflecting stable gas chemistry at the gas source.

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Section: Characteristics Of Fumarolic Gas System At Mt Nakadakementioning

confidence: 78%

Temporal variation in chemical composition of the volcanic plume from Aso volcano, Japan, measured by remote FT-IR spectroscopy

Mori

Notsu

2008

Geochem. J.

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“…Mihara on IzuOshima Island (Sano et al, , 1991(Sano et al, , 1995 or at Galeras volcano (Sano et al, 1997) showed a link between the 3 He/ 4 He ratio evolution and the eruptive activity of the volcano. For Galeras, Fischer et al (1997) showed that injections of mantle-derived volatiles increase both the He content of the gases and the 3 He/ 4 He ratios during times of high activity (frequent eruptions). Table 2 presents previous helium isotope measurements in gases from Satsuma-Iwojima from the literature.…”

Section: Resultsmentioning

confidence: 99%

Helium isotopes at Satsuma-Iwojima volcano, Japan.

2002

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We present isotopic analyses of helium in fluids collected during two field trips at Satsuma-Iwojima and Shin-Iwojima islands in November 1998 and October 2000. These are the first reported helium measurements at Shin-Iwojima. Copper tubes tightly closed by clamps at both ends were used to sample 1) gases from high and low temperature fumaroles in the summit area of Iwodake cone, 2) gases from a fumarole on Shin-Iwojima, 3) gas bubbling from the sea-floor along Shin-Iwojima where an increasing bubbling intensity was observed between 1998 and 2000, 4) waters from Sakamoto and Higashi hot springs. For gas samples, two types of correction for atmospheric contamination are discussed, using either the neon concentration or just the partial pressure of condensable gases at liquid nitrogen temperature; this latter method turned out to be very efficient for many samples. For all gas samples, we found 3 He/ 4 He isotopic ratios between 7.1 and 8.2 times the atmospheric ratio, pointing to a magmatic origin for fumaroles both at Iwodake crater and at Shin-Iwojima island. Our measurements show a decrease of the isotopic ratios at Iwodake with decreasing temperature of the fumarole. Comparing the results of both field trips and those published in previous studies, we suggest this volcanic system is undergoing a recent increase of activity.served both on and off-shore, including high (>800°C) and low temperature fumaroles, hot springs and gas bubbling, which provide a good opportunity to sample and study this volcanic system. In this aim, helium has interesting properties: a gaseous state, inertness, and above all, its isotopes show contrasting ratios in the continental crust (<0

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“…7.2 a Tacaná volcano seen from Agua Caliente village, to the northwest, the white square indicates the near summit fumarolic field (3,600 m asl). Giggenbach et al 1990;Giggenbach and Corrales Soto 1992;Delfín et al 1996;Fischer et al 1997). The relatively high Cl contents, in all springs, in particular for Group (1), probably derive from a deep, geothermal aquifer hosting Na-Cl-type waters.…”

Section: Thermal Springs and Hydrologymentioning

confidence: 97%

“…4), despite the significant smaller size of the volcanic edifice. Volcanoes with a similar size as Tacaná hosting volcano-hydrothermal systems of similar dimension are Cumbal, Colombia (*20 km 2 ; Lewicki et al 2000), and Irazú-Turrialba volcanic complex, Costa Rica (*50 km 2 ; Rouwet et al 2010 Giggenbach et al 1990;Sturchio and Williams 1990), and Galeras (Colombia, *10 2 km 2 ; Fischer et al 1997). Nevertheless, other active large volcanic edifices do not manifest hydrothermal activity on their flanks, despite the abundant meteoric recharge of possible thermal aquifers; examples of such type in Mexico are Popocatépetl, and Volcán de Fuego de Colima.…”

Section: 7mentioning

confidence: 99%

Fluid Geochemistry of Tacaná Volcano-Hydrothermal System

Rouwet

Taran

Inguaggiato

2015

Active Volcanoes of the World

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Tacaná hosts an active volcano-hydrothermal system, characterized by boiling temperature fumaroles, near the summit (3,600-3,800 m asl), and bubbling degassing thermal springs near its base (1,000-2,000 m asl). The magmatic signature of gases rising to the surface is attested by their high CO 2 contents (δ 13 C CO2 = −3.6 ± 1.3 ‰), and relatively high 3 He/ 4 He ratios (6.0 ± 0.9 R A ), with a CO 2 / 3 He ratio typical for the Central American Arc (2.3 × 10 10 -6.9 × 10 11 ). Such magmatic signature is practically identical for the near-summit fumaroles, and the bubbling gases at the base of Tacaná edifice. Besides the HCO 3 -enrichment in thermal spring waters, the springs (pH 5.8-6.7) show a SO 4 -and minor Cl-enrichment: a CO 2 and H 2 S + SO 2 -rich magmatic steam condenses into a deeper geothermal aquifer, and the resulting hydrothermal fluid mixes with meteoric waters near the surface. The recharge area for the thermal springs is located at higher elevations (>400 m higher than spring outlet elevation), as inferred from the δD-δ 18 O data for rivers, thermal and cold springs. These general insights of the Tacaná volcano-hydrothermal system serve as the baseline for future volcanic surveillance, and geothermal prospection. The main locus of hydrothermal activity is located inside the Tacaná horseshoe-shaped crater in the northwestern sector of the volcanic edifice. In terms of volcanic hazard, this sector can be considered the most probable site for future phreatic activity.

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The chemical and isotopic composition of fumarolic gases and spring discharges from Galeras Volcano, Colombia

Cited by 86 publications

References 47 publications

Temporal variation in chemical composition of the volcanic plume from Aso volcano, Japan, measured by remote FT-IR spectroscopy

Temporal variation in chemical composition of the volcanic plume from Aso volcano, Japan, measured by remote FT-IR spectroscopy

Helium isotopes at Satsuma-Iwojima volcano, Japan.

Fluid Geochemistry of Tacaná Volcano-Hydrothermal System

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