A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala)
The climactic Los Chocoyos (LCY) eruption from Atitlán caldera (Guatemala) is a key chronostratigraphic marker for the Quaternary period given the extensive distribution of its deposits that reached both the Pacific and Atlantic Oceans. Despite LCY tephra being an important marker horizon, a radioi...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
11 January 2021
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| In: |
Journal of quaternary science
Year: 2021, Volume: 36, Issue: 2, Pages: 169-179 |
| ISSN: | 1099-1417 |
| DOI: | 10.1002/jqs.3265 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1002/jqs.3265 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.3265 
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| Author Notes: | Alejandro Cisneros de León, Julie C. Schindlbeck-Belo, Steffen Kutterolf, Martin Danišík, Axel K. Schmitt, Armin Freundt, Wendy Pérez, Janet C. Harvey, Kuo-Lung Wang, and Hao-Yang Lee |
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| 245 | 1 | 2 | |a A history of violence |b magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala) |c Alejandro Cisneros de León, Julie C. Schindlbeck-Belo, Steffen Kutterolf, Martin Danišík, Axel K. Schmitt, Armin Freundt, Wendy Pérez, Janet C. Harvey, Kuo-Lung Wang, and Hao-Yang Lee |
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| 520 | |a The climactic Los Chocoyos (LCY) eruption from Atitlán caldera (Guatemala) is a key chronostratigraphic marker for the Quaternary period given the extensive distribution of its deposits that reached both the Pacific and Atlantic Oceans. Despite LCY tephra being an important marker horizon, a radioisotopic age for this eruption has remained elusive. Using zircon (U-Th)/He geochronology, we present the first radioisotopically determined eruption age for the LCY of 75 ± 2 ka. Additionally, the youngest zircon crystallization 238U-230Th rim ages in their respective samples constrain eruption age maxima for two other tephra units that erupted from Atitlán caldera, W-Fall (130 +16/−14 ka) and I-Fall eruptions (56 +8.2/−7.7 ka), which under- and overlie LCY tephra, respectively. Moreover, rim and interior zircon dating and glass chemistry suggest that before eruption silicic magma was stored for >80 kyr, with magma accumulation peaking within ca. 35 kyr before the LCY eruption during which the system may have developed into a vertically zoned magma chamber. Based on an updated distribution of LCY pyroclastic deposits, a new conservatively estimated volume of 1220 ± 150 km3 is obtained (volcanic explosivity index VEI > 8), which confirms the LCY eruption as the first-ever recognized supereruption in Central America. | ||
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