Dmitri Rouwet - Academia.edu (original) (raw)

Papers by Dmitri Rouwet

Earth, Planets and Space, 2021

This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and... more This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and Irazú volcanoes in central Costa Rica, manifested as thermal springs, summit crater lakes, and fumarolic degassing at both volcanoes. Our period of observations (2007–2012) coincides with the pre- and early syn-phreatic eruption stages of Turrialba volcano that resumed volcanic unrest since 2004, after almost 140 years of quiescence. Peculiarly, the generally stable Irazú crater lake dropped its level during this reawakening of Turrialba. The isotopic composition of all the discharged fluids reveals their Caribbean meteoric origin. Four groups of thermal springs drain the northern flanks of Turrialba and Irazú volcanoes into two main rivers. Río Sucio (i.e. “dirty river”) is a major rock remover on the North flank of Irazú, mainly fed by the San Cayetano spring group. Instead, one group of thermal springs discharges towards the south of Irazú. All thermal spring waters are of SO4-type (...

Frontiers in Earth Science, Aug 2, 2023

EGU General Assembly Conference Abstracts, Apr 1, 2018

Geological Society, London, Special Publications, Mar 24, 2016

Poás Volcano (Costa Rica) resumed phreatic activity on 24 March 2006 after twelve years of quiesc... more Poás Volcano (Costa Rica) resumed phreatic activity on 24 March 2006 after twelve years of quiescence. From March 2006 to June 2010, the initial phase of the ongoing eruption cycle, 110 phreatic eruptions were reported. This study presents the temporal variations in the chemical and isotopic (δD and δ18O) compositions of Laguna Caliente crater lake for the period prior to the eruption until June 2010. No systematic relationship with the phreatic eruptive activity exists. A combined mass and Cl budget analysis enables quantification of the seepage rate (7 kg s−1), the input rate of the ‘volcanic fluid’ (Qf), and the Cl concentration (Cle) in the evaporation plume (13 300 mg l−1). A modelling procedure for variable seepage rates leads to more realistic estimates of 50–100 kg s−1, which better represent the observed lake water chemistry, hence suggesting dynamic fluid recycling between the lake and the underlying magmatic–hydrothermal system. The high Cl concentration in the evaporation plume and the dynamic fluid recycling at the lake bottom characterize Laguna Caliente as an ‘open-air’ fumarole, discrediting water chemistry as an efficient monitoring tool at the classic monitoring frequency. A conceptual model of phreatic eruptions is linked to our observations.

EGU General Assembly Conference Abstracts, Apr 1, 2018

Bulletin of Volcanology, Jul 17, 2008

... fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic ... more ... fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance Dmitri Rouwet & Salvatore Inguaggiato & Yuri Taran & Nicholas Varley & José A. Santiago S. ... 1987; De la Cruz-Reyna et al. 1989). ...

Nature Communications, Oct 26, 2022

Goldschmidt2022 abstracts

Journal of Geophysical Research: Solid Earth, 2015

Here we report on the first assessment of volatile fluxes from the hyperacid crater lake hosted w... more Here we report on the first assessment of volatile fluxes from the hyperacid crater lake hosted within the summit crater of Copahue, a very active volcano on the Argentina-Chile border. Our observations were performed using a variety of in situ and remote sensing techniques during field campaigns in March 2013, when the crater hosted an active fumarole field, and in March 2014, when an acidic volcanic lake covered the fumarole field. In the latter campaign, we found that 566 to 1373 t d À1 of SO 2 were being emitted from the lake in a plume that appeared largely invisible. This, combined with our derived bulk plume composition, was converted into flux of other volcanic species (H 2 O~10989 t d À1 , CO 2~6 38 t d À1 , HCl~66 t d À1 , H 2~3 .3 t d À1 , and HBr~0.05 t d À1). These levels of degassing, comparable to those seen at many open-vent degassing arc volcanoes, were surprisingly high for a volcano hosting a crater lake. Copahue's unusual degassing regime was also confirmed by the chemical composition of the plume that, although issuing from a hot (65°C) lake, preserves a close-to-magmatic signature. EQ3/6 models of gas-water-rock interaction in the lake were able to match observed compositions and demonstrated that magmatic gases emitted to the atmosphere were virtually unaffected by scrubbing of soluble (S and Cl) species. Finally, the derived large H 2 O flux (10,988 t d À1) suggested a mechanism in which magmatic gas stripping drove enhanced lake water evaporation, a process likely common to many degassing volcanic lakes worldwide.

Goldschmidt2022 abstracts

Earth, Planets and Space, 2021

This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and... more This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and Irazú volcanoes in central Costa Rica, manifested as thermal springs, summit crater lakes, and fumarolic degassing at both volcanoes. Our period of observations (2007–2012) coincides with the pre- and early syn-phreatic eruption stages of Turrialba volcano that resumed volcanic unrest since 2004, after almost 140 years of quiescence. Peculiarly, the generally stable Irazú crater lake dropped its level during this reawakening of Turrialba. The isotopic composition of all the discharged fluids reveals their Caribbean meteoric origin. Four groups of thermal springs drain the northern flanks of Turrialba and Irazú volcanoes into two main rivers. Río Sucio (i.e. “dirty river”) is a major rock remover on the North flank of Irazú, mainly fed by the San Cayetano spring group. Instead, one group of thermal springs discharges towards the south of Irazú. All thermal spring waters are of SO4-type (...

Frontiers in Earth Science, Aug 2, 2023

EGU General Assembly Conference Abstracts, Apr 1, 2018

Geological Society, London, Special Publications, Mar 24, 2016

Poás Volcano (Costa Rica) resumed phreatic activity on 24 March 2006 after twelve years of quiesc... more Poás Volcano (Costa Rica) resumed phreatic activity on 24 March 2006 after twelve years of quiescence. From March 2006 to June 2010, the initial phase of the ongoing eruption cycle, 110 phreatic eruptions were reported. This study presents the temporal variations in the chemical and isotopic (δD and δ18O) compositions of Laguna Caliente crater lake for the period prior to the eruption until June 2010. No systematic relationship with the phreatic eruptive activity exists. A combined mass and Cl budget analysis enables quantification of the seepage rate (7 kg s−1), the input rate of the ‘volcanic fluid’ (Qf), and the Cl concentration (Cle) in the evaporation plume (13 300 mg l−1). A modelling procedure for variable seepage rates leads to more realistic estimates of 50–100 kg s−1, which better represent the observed lake water chemistry, hence suggesting dynamic fluid recycling between the lake and the underlying magmatic–hydrothermal system. The high Cl concentration in the evaporation plume and the dynamic fluid recycling at the lake bottom characterize Laguna Caliente as an ‘open-air’ fumarole, discrediting water chemistry as an efficient monitoring tool at the classic monitoring frequency. A conceptual model of phreatic eruptions is linked to our observations.

EGU General Assembly Conference Abstracts, Apr 1, 2018

Bulletin of Volcanology, Jul 17, 2008

... fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic ... more ... fumaroles and bubbling gases at Tacaná Volcano (Mexico–Guatemala): implications for volcanic surveillance Dmitri Rouwet & Salvatore Inguaggiato & Yuri Taran & Nicholas Varley & José A. Santiago S. ... 1987; De la Cruz-Reyna et al. 1989). ...

Nature Communications, Oct 26, 2022

Goldschmidt2022 abstracts

Journal of Geophysical Research: Solid Earth, 2015

Here we report on the first assessment of volatile fluxes from the hyperacid crater lake hosted w... more Here we report on the first assessment of volatile fluxes from the hyperacid crater lake hosted within the summit crater of Copahue, a very active volcano on the Argentina-Chile border. Our observations were performed using a variety of in situ and remote sensing techniques during field campaigns in March 2013, when the crater hosted an active fumarole field, and in March 2014, when an acidic volcanic lake covered the fumarole field. In the latter campaign, we found that 566 to 1373 t d À1 of SO 2 were being emitted from the lake in a plume that appeared largely invisible. This, combined with our derived bulk plume composition, was converted into flux of other volcanic species (H 2 O~10989 t d À1 , CO 2~6 38 t d À1 , HCl~66 t d À1 , H 2~3 .3 t d À1 , and HBr~0.05 t d À1). These levels of degassing, comparable to those seen at many open-vent degassing arc volcanoes, were surprisingly high for a volcano hosting a crater lake. Copahue's unusual degassing regime was also confirmed by the chemical composition of the plume that, although issuing from a hot (65°C) lake, preserves a close-to-magmatic signature. EQ3/6 models of gas-water-rock interaction in the lake were able to match observed compositions and demonstrated that magmatic gases emitted to the atmosphere were virtually unaffected by scrubbing of soluble (S and Cl) species. Finally, the derived large H 2 O flux (10,988 t d À1) suggested a mechanism in which magmatic gas stripping drove enhanced lake water evaporation, a process likely common to many degassing volcanic lakes worldwide.

Goldschmidt2022 abstracts