Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Magma degassing during subglacial eruptions and its use to reconstruct palaeo-ice thicknesses.
AU - Tuffen, Hugh
AU - Owen, Jacqueline
AU - Denton, Joanna
N1 - The final, definitive version of this article has been published in the Journal, Earth-Science Reviews 99 (1-2), 2010, © ELSEVIER.
PY - 2010/4
Y1 - 2010/4
N2 - 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.
AB - 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.
KW - Subglacial eruptions
KW - glaciovolcanism
KW - ice sheet
KW - palaeoenvironments
KW - magma
KW - degassing
KW - Iceland
KW - British Columbia
KW - hyaloclastite
KW - pillow lava
KW - tuya
KW - tindar
UR - http://www.scopus.com/inward/record.url?scp=77950518385&partnerID=8YFLogxK
U2 - 10.1016/j.earscirev.2010.01.001
DO - 10.1016/j.earscirev.2010.01.001
M3 - Journal article
VL - 99
SP - 1
EP - 18
JO - Earth-Science Reviews
JF - Earth-Science Reviews
SN - 0012-8252
IS - 1-2
ER -