2001
DOI: 10.1130/0091-7613(2001)029<1059:heffca>2.0.co;2
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Hydrothermal element fluxes from Copahue, Argentina: A “beehive” volcano in turmoil

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Cited by 104 publications
(78 citation statements)
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“…Both the flow of the hot springs and the concentrations of several of the RFEs increased dramatically, which was interpreted as the result of an intrusion of new magma into the hydrothermal reservoir and dissolution of the chilled magma [Varekamp et al, 2001] .This pulse of enhanced volcanic output of more concentrated fluids could be discerned in the compositional evolution of Lake Caviahue, which, through its large volume, attenuates the impact of these compositionally extreme discharge events [Varekamp, 2003].The hot springs remained active throughout the turmoil of the eruptive period, while large amounts of ash were deposited on top of the volcano.…”
Section: The Acid Hot Springs Of Copahue Volcanomentioning
confidence: 99%
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“…Both the flow of the hot springs and the concentrations of several of the RFEs increased dramatically, which was interpreted as the result of an intrusion of new magma into the hydrothermal reservoir and dissolution of the chilled magma [Varekamp et al, 2001] .This pulse of enhanced volcanic output of more concentrated fluids could be discerned in the compositional evolution of Lake Caviahue, which, through its large volume, attenuates the impact of these compositionally extreme discharge events [Varekamp, 2003].The hot springs remained active throughout the turmoil of the eruptive period, while large amounts of ash were deposited on top of the volcano.…”
Section: The Acid Hot Springs Of Copahue Volcanomentioning
confidence: 99%
“…Copahue Volcano (37.85°S, 71.17°W Neuquen Province) has an acid crater lake and acid hot springs (Table 1) The latter feed a river system (Upper Rio Agrio) which discharges into a large (0.5 km 3 ), horseshoe-shaped glacial lake (Lake Caviahue) that overflows in one arm through the Lower Rio Agrio.This acid watershed has been studied for several years [Varekamp et al, 2001[Varekamp et al, ,2003Wendt-Potthoff and Koschorreck, 2002;Pedrozo et al, 2001], with an emphasis on the changing composition of the fluids over time, as well as the presence of bacteria in these acid waters.…”
Section: The Acid Hot Springs Of Copahue Volcanomentioning
confidence: 99%
“…It has been suggested that an increase in Mg in acidic waters precedes volcanic eruptions as it was first shown by Giggenbach (1974) for Ruapehu crater lake and this phenomenon was repeated later at Ruapehu and Copahue volcanoes (Christenson and Wood, 1993;Varekamp et al, 2001). Giggenbach (1974) suggested that this is a response on the intrusion of new magma into the acidic aquifer.…”
Section: Water Chemistry: Major Componentsmentioning
confidence: 95%
“…An inserted ternary plot in Fig. 9 compares the data points for Poas, Ruapehu and Copahue crater lakes (Rowe et al, 1992;Christenson and Wood, 1993;Varekamp et al, 2001) with the data for the Ebeko + Yurieva composition.…”
Section: Water Chemistry: Major Componentsmentioning
confidence: 99%
“…Gravity anomaly studies (Gottsmann et al 2008;Coco et al 2016) and acoustic waves (Ferrazzini and Aki 1987) also provide insight into subsurface processes. Measurements of water chemistry composition from hydrothermal manifestation such as boiling pools, crater lakes and thermal springs are also routinely conducted (Varekamp et al 2001(Varekamp et al , 2009Federico et al 2002;Tassi et al 2003). The increase of Rare Earth Elements (REE)/Cl, RFEs (e.g., Ca, Mg, K)/Cl and the increase in SiO 2 concentration are indicative of either intrusion of fresh magma within the hydrothermal reservoir or exposure to water/rock interaction of fresh rock due to hydrofracturing (Varekamp et al 2008).…”
Section: Hydrothermal Systems and Unrestmentioning
confidence: 99%