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  • (U–Th)/He  (1)
  • Age, dated; Central America; Event label; Geochemistry; geochronology; GLASS; Neodymium-144/Neodymium-143; Neodymium-144/Neodymium-143, standard error; Replicate; ROCK; Rock sample; Sample code/label; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard error; TB_E17-1; TB_E17-17; TB_E17-32; TB_E17-4; Thorium; Thorium, standard error; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard error; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard error; Type; Unit; Uranium; Uranium, standard error; Uranium/Thorium, standard error; Uranium/Thorium ratio; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard error; Uranium-238/Thorium-232 activity ratio; Uranium-238/Thorium-232 activity ratio, standard error; zircon  (1)
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  • 1
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    Unknown
    A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala) (2021)
    Details
    Publication Date: 2021-06-30
    Description: 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.
    Description: Deutsche Forschungsgemeinschaft SCH 2521/6‐1
    Keywords: 551.701 ; 238U–230Th disequilibrium ; geochronology ; tephrochronology ; (U–Th)/He ; zircon
    Type: article
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    CITATION GEO-LEO
  • 2
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    Unknown
    Whole-rock U-Th and Sr-Nd isotope compositions of Ilopango TB suite (Table S9) (2021)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Description: This dataset includes results from U-series and Sr-Nd whole-rock isotope compositions of the last four explosive silicic eruptions from Ilopango caldera in El Salvador (TBJ, TB2, TB3, and TB4). Sr and Nd isotope ratios were measured with a Nu Instruments thermal ionization mass spectrometer (Nu-TIMS) at Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) in the state of Baja California (Mexico), whereas U and Th concentrations and isotopes were measured at University of Wyoming (UWYO) were measured by isotope dilution using a ThermoFisher Neptune ICP-MS multicollector.
    Keywords: Age, dated; Central America; Event label; Geochemistry; geochronology; GLASS; Neodymium-144/Neodymium-143; Neodymium-144/Neodymium-143, standard error; Replicate; ROCK; Rock sample; Sample code/label; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard error; TB_E17-1; TB_E17-17; TB_E17-32; TB_E17-4; Thorium; Thorium, standard error; Thorium-230/Thorium-232 activity ratio; Thorium-230/Thorium-232 activity ratio, standard error; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard error; Type; Unit; Uranium; Uranium, standard error; Uranium/Thorium, standard error; Uranium/Thorium ratio; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard error; Uranium-238/Thorium-232 activity ratio; Uranium-238/Thorium-232 activity ratio, standard error; zircon
    Type: Dataset
    Format: text/tab-separated-values, 139 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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