High-precision ultra-distal Holocene tephrochronology in North America

Sean Pyne-O'Donnell, P Hughes, D Froese, B Jensen, S Kuehn, G Mallon, M Amesbury, D Charman, T Daley, N Loader, D Mauquoy, F. A. Street-Perrott , J Woodman-Ralph

    Research output: Contribution to journalArticlepeer-review

    58 Citations (Scopus)

    Abstract

    Far-travelled volcanic ashes (tephras) from Holocene eruptions in Alaska and the Pacific northwest have been traced to the easternmost extent of North America, providing the basis for a new high-precision geochronological framework throughout the continent through tephrochronology (the dating and correlation of tephra isochrons in sedimentary records). The reported isochrons are geochemically distinct, with seven correlated to documented sources in Alaska and the Cascades, including the Mazama ash from Oregon (w7600 years old) and the eastern lobe of the White River Ash from Alaska (~1150 years old). These findings mark the beginning of a tephrochronological framework of enhanced precision across North America, with applications in palaeoclimate, surface process and archaeological studies. The particle travel distances involved (up tow7000 km) also demonstrate the potential for continent-wide or trans-Atlantic socio-economic disruption from similar future eruptions.
    Original languageEnglish
    Pages (from-to)6-11
    JournalQuaternary Science Reviews
    Volume52
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Volcanic ash
    • Tephra
    • Ultra-distal tephrochronologyCryptotephra
    • Cryptotephra
    • Newfoundland
    • Geochronology
    • EPMA geochemistry
    • Holocene
    • Palaeoclimate

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