TY  - JOUR
A1  - Cisneros de León, Alejandro
A1  - Schindlbeck‐Belo, Julie C.
A1  - Kutterolf, Steffen
A1  - Danišík, Martin
A1  - Schmitt, Axel K.
A1  - Freundt, Armin
A1  - Pérez, Wendy
A1  - Harvey, Janet C.
A1  - Wang, Kuo‐Lung
A1  - Lee, Hao‐Yang
T1  - A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala)
Y1  - 2021-01-11
JF  - Journal of Quaternary Science
DO  - 10.23689/fidgeo-4049
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8389
ER  -