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Dynamics of explosive paroxysms at open-vent andesitic systems : High-resolution mass distribution analyses of the 2006 Tungurahua fall deposit (Ecuador)
- Source :
- Earth and Planetary Science Letters, Earth and Planetary Science Letters, 2013, 361, pp.343-355. ⟨10.1016/j.epsl.2012.11.002⟩, Earth and Planetary Science Letters, Elsevier, 2013, 361, pp.343-355. ⟨10.1016/j.epsl.2012.11.002⟩
- Publication Year :
- 2013
-
Abstract
- Long-lasting andesitic eruptions sometimes include strong short-lived explosive events, which can pose significant hazards in populated regions. The origin and dynamics of such violent eruptions remain poorly known and may involve a combination of different factors. Tungurahua volcano, Ecuador, reawakens in 1999 and is an example of such an open-vent system that experienced a strong and deadly andesitic pyroclastic flow-forming event in August 2006. Inspection of the deposits suggested that the event could have been triggered by magma mixing (coexistence of both silicic pumices and andesitic scoria in the tephra), magma-water interaction (presence of xenolithic clasts) or deep andesitic magma reinjection (based on mineral chemistry). Here we investigate these options by performing a high-resolution mass budget analysis of the scoria fall deposit. This is achieved by analysing componentry compositions and their mass distribution pattern in the layer, which allow us to document and integrate exponential and power laws mass decay rates over wide areas. The results yield a total mass for the tephra layer of similar to 2 x 10(10) kg. The pumice mass fraction is far too small (
- Subjects :
- mass componentry distribution
010504 meteorology & atmospheric sciences
[SDE.MCG]Environmental Sciences/Global Changes
Geochemistry
Silicic
Pyroclastic rock
Volcanic explosivity index
010502 geochemistry & geophysics
01 natural sciences
Geochemistry and Petrology
Pumice
Earth and Planetary Sciences (miscellaneous)
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology
magnitude
Tephra
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Tungurahua volcano
Geophysics
Volcano
13. Climate action
Space and Planetary Science
Magma
Scoria
intensity
density distributions
Geology
Subjects
Details
- ISSN :
- 0012821X
- Database :
- OpenAIRE
- Journal :
- Earth and Planetary Science Letters, Earth and Planetary Science Letters, 2013, 361, pp.343-355. ⟨10.1016/j.epsl.2012.11.002⟩, Earth and Planetary Science Letters, Elsevier, 2013, 361, pp.343-355. ⟨10.1016/j.epsl.2012.11.002⟩
- Accession number :
- edsair.doi.dedup.....6e4d5075f7d1c9569c6e38c35dc28d4e