The magmatic- and hydrothermal-dominated fumarolic system at the Active Crater of Lascar volcano, northern Chile

Tassi, Franco; Aguilera, Felipe; Vaselli, Orlando; Medina, Eduardo; Tedesco, Dario; Huertas, António Delgado; Poreda, Robert J.; Kojima, Shoji

doi:10.1007/s00445-008-0216-z

Cited by 64 publications

(60 citation statements)

References 51 publications

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“…The N 2ex / 3 He ratios of the Lastarria fumaroles, calculated using Eq. 2, range from 0.7×10 8 to 2.5×10 9 (Table 2), which are consistent with active subduction zone volcanoes (Poorter et al 1991;Giggenbach and Poreda 1993;Fischer et al 1998;Sano et al 2001;Snyder et al 2003;Tassi et al 2009). We find that higher [N 2 ] meas are associated with an increase in magmatic-related compounds (Table 1) leading us to the conclusion that LVC volatile emissions originate from magmatic sources.…”

Section: Fluid Source Regionssupporting

confidence: 63%

“…Following headspace analysis, the alkaline solution was separated from the suspended solid precipitate by centrifugation in order to determine: (1) CO 2, in the form of CO 3 2− , by titration with 0.5 N HCl; (2) SO 2 by ion chromatography (Metrohm Compact 761) after oxidizing SO 2 to SO 4 2− using H 2 O 2 , and (3) HCl and HF, as Cl − and F − , respectively, by ion chromatography similar to the methods described previously (Tassi et al 2009. The solid CdS, derived from the combination of H 2 S with Cd, was oxidized to SO 4 2− using H 2 O 2 in order to determine [H 2 S] by ion chromatography (Montegrossi et al 2001).…”

Section: Analytical Proceduresmentioning

confidence: 99%

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Geochemical model of a magmatic–hydrothermal system at the Lastarria volcano, northern Chile

et al. 2011

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Section: Fluid Source Regionssupporting

confidence: 63%

Section: Analytical Proceduresmentioning

confidence: 99%

Geochemical model of a magmatic–hydrothermal system at the Lastarria volcano, northern Chile

et al. 2011

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“…Significantly, this data set provides little evidence for the cyclical behaviour that was postulated using pre-1993 data in both Wooster and Rothery (1997) and Matthews et al (1997) and it therefore supports the suggestion of Aguilera (2005) that these cycles halted after the volcano's 1993 eruption. However, the decreasing trend in radiated energy over the period does corroborate the findings of Tassi et al (2009) which suggest a decrease in fumarolic degassing between 2002 and 2006, which is attributed to decreasing inputs of magmatic fluids.…”

Section: The Lascar Time-seriessupporting

confidence: 79%

“…The summit at 5592 m consists of five overlapping craters, only one of which remains active (Tassi et al 2009). Lascar's largest recorded eruption was in 1993 which resulted in localized pyroclastic flows and ash fallout over Buenos Aires, some 1500 km downwind (Wooster and Rothery 1997).…”

Section: Study Area and Data Acquisitionmentioning

confidence: 99%

Evaluation of SWIR-based methods for quantifying active volcano radiant emissions using NASA EOS-ASTER data

Wooster

2011

Geomatics, Natural Hazards and Risk

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Analysis of thermally emissive volcanic features using satellite infrared remote sensing has been conducted over recent decades, primarily using shortwave and thermal infrared (SWIR; TIR) radiance data. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), mounted on the Earth Observation System (EOS) Terra satellite, offers an advance on earlier instruments, having more bands covering the SWIR atmospheric window and offering a wider dynamic range. This paper compares methods used to analyse ASTER SWIR imagery of active volcanoes, using both simulated cases and actual ASTER imagery of Lascar Volcano, and focuses on radiative power estimates. Those based on the Oppenheimer approach are found to be most reliable for simulated surfaces, with the Lombardo and Buongiorno and Dozier retrievals having larger uncertainties in most cases. However, the Dozier Method results in the highest proportion of successful retrievals, the reliability of which is influenced by factors including band combination, gain setting and saturation. The radiative power metric is shown as a more reliable measure than sub-pixel characterisations of hotspot temperature and area, as retrieved by these methods. We conclude with an assessment of ASTER in terms of its utility for providing quantitative observations of active volcanic surfaces.

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“…This is consistent with contemporaneous chemical and isotopic analyses of gas emissions from Láscar, which show that fumaroles within the active crater have a stronger magmatic signature (i.e. high SO 2 , HCL and HF) than fumaroles that are situated on the crater rim (Tassi et al, 2009). Efficient degassing of the upper conduit appears to have been sustained throughout the eruptive period.…”

Section: Láscarsupporting

confidence: 72%

Monitoring volcanic thermal anomalies from space: Size matters

Murphy¹,

Filho²,

Oppenheimer³

2011

Journal of Volcanology and Geothermal Research

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Measuring temperatures on volcanoes from space provides important constraints on the transfer of mass and heat to the Earth's surface. Time series of multispectral infrared images, acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) between 2000 and 2009, were inspected to investigate fluctuations in thermal anomalies at both Mount Erebus (Antarctica) and Láscar volcano (Chile). Several thermal metrics were explored: i) maximum pixel temperatures above background, ii) the spatial extent of low, moderate and high temperature anomalies, and iii) the spatial extent of shortwave infrared anomalies. The maximum pixel temperature metric correlated to eruptive events at Láscar volcano yet displayed significant scatter at Erebus. The spatial extent of both temperature and short-wave infrared anomalies correlates well with eruptive activity at both volcanoes.Limited variation in the size of thermal anomalies was observed at Erebus throughout the time series due to the stability of a long-lived lava lake, with the exception of a seasonal expansion in low temperature anomalies associated with localized snow-melt at the peak. This finding has implications for the interpretation of low temperature anomalies at other volcanoes. At least two different types of precursory signals are identified at Láscar: i) a gradual increase and ii) a dip, in the size and intensity of thermal anomalies. These thermal precursors appear to be associated with different eruptive styles. The former precedes a relatively shallow, short lived eruption; the later a prolonged eruptive period. Such thermal precursors could therefore help to constrain not only the timing but also the style and duration of an imminent eruptive episode.

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The magmatic- and hydrothermal-dominated fumarolic system at the Active Crater of Lascar volcano, northern Chile

Abstract: Low-to-high temperature fumaroles discharging from the Active Crater of Lascar volcano (northern Chile)

Cited by 64 publications

References 51 publications

Geochemical model of a magmatic–hydrothermal system at the Lastarria volcano, northern Chile

Geochemical model of a magmatic–hydrothermal system at the Lastarria volcano, northern Chile

Evaluation of SWIR-based methods for quantifying active volcano radiant emissions using NASA EOS-ASTER data

Monitoring volcanic thermal anomalies from space: Size matters

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