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Simultaneous fall and flow during pyroclastic eruptions: A novel proximal hybrid facies

Dowey, Natasha; Williams, Rebecca

Authors

Natasha Dowey



Abstract

The deposits of Plinian and subplinian eruptions provide critical insights into past volcanic events and inform numerical models that aim to mitigate against future hazards. However, pyroclastic deposits are often considered from either a fallout or pyroclastic density current (PDC) perspective, with little attention given to facies exhibiting characteristics of both processes. Such hybrid units may be created where fallout and PDCs act simultaneously, where a transitional phase between the two occurs, and/or due to reworking. This study presents analysis of a novel hybrid pyroclastic lithofacies found on Tenerife (Canary Islands) and Pantelleria (Italy). The coarse pumice block facies has an openwork texture and correlates with distal Plinian units, but it is cross-stratified and relatively poorly sorted with an erosional base. The facies is proposed to record the simultaneous interaction of very proximal fallout and turbulent PDCs, and it reveals a fuller spectrum of hybrid deposition than previously reported. This work highlights the importance of recognizing hybrid deposition both in the rock record and in hazard modeling.

Citation

Dowey, N., & Williams, R. (2022). Simultaneous fall and flow during pyroclastic eruptions: A novel proximal hybrid facies. Geology, 50(10), 1187-1191. https://doi.org/10.1130/G50169.1

Journal Article Type Article
Acceptance Date May 22, 2022
Online Publication Date Aug 2, 2022
Publication Date Oct 1, 2022
Deposit Date May 25, 2022
Publicly Available Date Aug 3, 2022
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 50
Issue 10
Pages 1187-1191
DOI https://doi.org/10.1130/G50169.1
Public URL https://hull-repository.worktribe.com/output/4003482

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