Volumetric extrusive rates of silicic supereruptions from the Afro-Arabian large igneous province

Jennifer E. Thines (), Ingrid A. Ukstins, Corey Wall and Mark Schmitz
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Jennifer E. Thines: University of Iowa
Ingrid A. Ukstins: The University of Auckland
Corey Wall: Boise State University
Mark Schmitz: Boise State University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract The main phase of silicic volcanism from the Afro-Arabian large igneous province preserves some of the largest volcanic eruptions on Earth, with six units totaling >8,600 km3 dense rock equivalent (DRE). The large volumes of rapidly emplaced individual eruptions present a case study for examining the tempo of voluminous silicic magma generation and emplacement. Here were report high-precision 206Pb/238U zircon ages and show that the largest sequentially dated eruptions occurred within 48 ± 34 kyr (29.755 ± 0.023 Ma to 29.707 ± 0.025 Ma), yielding the highest known long-term volumetric extrusive rate of silicic volcanism on Earth. While these are the largest known sequential silicic supereruptions, they did not cause major global environmental change. We also provide a robust tie-point for calibration of the geomagnetic polarity timescale by integrating 40Ar/39Ar data with our 206Pb/238U ages to yield new constraints on the duration of the C11n.1r Subchron.

Date: 2021
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DOI: 10.1038/s41467-021-26468-5

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