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Explosive-effusive volcanic eruption transitions caused by sintering.

Wadsworth, Fabian B. and Llewellin, Edward W. and Vasseur, Jérémie and Gardner, James E. and Tuffen, Hugh (2020) 'Explosive-effusive volcanic eruption transitions caused by sintering.', Science advances., 6 (39). eaba7940.

Abstract

Silicic volcanic activity has long been framed as either violently explosive or gently effusive. However, recent observations demonstrate that explosive and effusive behavior can occur simultaneously. Here, we propose that rhyolitic magma feeding subaerial eruptions generally fragments during ascent through the upper crust and that effusive eruptions result from conduit blockage and sintering of the pyroclastic products of deeper cryptic fragmentation. Our proposal is supported by (i) rhyolitic lavas are volatile depleted; (ii) textural evidence supports a pyroclastic origin for effusive products; (iii) numerical models show that small ash particles ≲10−5 m can diffusively degas, stick, and sinter to low porosity, in the time available between fragmentation and the surface; and (iv) inferred ascent rates from both explosive and apparently effusive eruptions can overlap. Our model reconciles previously paradoxical observations and offers a new framework in which to evaluate physical, numerical, and geochemical models of Earth’s most violent volcanic eruptions.

Item Type:Article
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Available under License - Creative Commons Attribution Non-commercial.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1126/sciadv.aba7940
Publisher statement:Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Date accepted:22 July 2020
Date deposited:07 October 2020
Date of first online publication:September 2020
Date first made open access:07 October 2020

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