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

Author

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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)

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.

Suggested Citation

  • Jennifer E. Thines & Ingrid A. Ukstins & Corey Wall & Mark Schmitz, 2021. "Volumetric extrusive rates of silicic supereruptions from the Afro-Arabian large igneous province," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26468-5
    DOI: 10.1038/s41467-021-26468-5
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