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Magma degassing during subglacial eruptions and its use to reconstruct palaeo-ice thicknesses.

Research output: Contribution to journalJournal article

Published

Journal publication date04/2010
JournalEarth-Science Reviews
Journal number1-2
Volume99
Number of pages18
Pages1-18
Original languageEnglish

Abstract

The degassing of magmatic volatiles during eruptions beneath ice sheets and glaciers, as recorded by the dissolved volatile content quenched in volcanic rocks, could provide powerful new constraints on former ice thicknesses in volcanic areas. As volcanic rocks are readily dateable using radiometric methods, subglacial volcanoes may therefore provide crucial information on the timing of palaeo-environmental fluctuations in the Quaternary. Volatile degassing is also likely to control the mechanisms of subglacial eruptions and their associated hazards. In this paper we lay out a number of criteria that must be satisfied for degassing to potentially record palaeo-ice thicknesses, using a variety of new datasets and calculations to highlight existing problems with the technique. These include uncertainties about volatile solubilities, non-equilibrium degassing, sample heterogeneity, hydration, post-quenching movement and whether subglacial pressures deviated significantly from glaciostatic. We propose new strategies for improvement of the technique and discuss how magmatic volatiles may control the style of subglacial eruptions.

Bibliographic note

The final, definitive version of this article has been published in the Journal, Earth-Science Reviews 99 (1-2), 2010, © ELSEVIER.