JpGU-AGU Joint Meeting 2020

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S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC41] Timescales of magmatism: from genesis to eruption

convener:Chamberlain Katy Jane(University of Derby), Iona McIntosh(Japan Agency for Marine-Earth Science and Technology), Kenichiro Tani(Department of Geology and Paleontology, National Museum of Nature and Science), Akihiko Tomiya(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

Magmatic processes are known to operate across a range of timescales: from thousands to millions of years' residence and evolution within a magmatic plumbing system, through to the hours to minutes prior to eruption. Understanding the timescales of these magmatic processes, including accumulation, ascent, eruption, and final cessation of activity is vital for interpreting and responding to future magmatic activity. Together with thorough dating of deposits that reveal timing and frequency of past eruptions, this knowledge provides the foundation for improved hazard management in volcanic regions. By using a range of petrological, geophysical, geochemical and geochronological tools, increasingly detailed timescale constraints can be placed on past eruptive episodes.

In this session we invite submissions that examine magmatism and volcanism across a variety of timescales; from residence and rejuvenation within the crustal column, to eruptive triggering mechanisms and syn-eruptive processes, and their relation to the long-term timing and frequency of repeated activity.

[SVC41-P01] Magma mixing triggering eruption of deep rhyolite at Ascension Island, south Atlantic

*Katy Jane Chamberlain1, Jenni Barclay2, Katie Preece3, Richard J Brown4, Iona McIntosh5, E IMF6 (1.ESRC, School of Environmental Sciences, University of Derby, Derby, DE22 1GB, UKUniversity of Derby, 2.School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK, 3.Department of Geography, College of Science, Swansea University, Swansea, SA2 8PP, UK., 4.Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK, 5.Institute for Marine Geodynamics, Japan Agency for Marine Earth Science and Technology, Yokosuka 237-0061, Japan, 6.Edinburgh Ion Microprobe Facility, University of Edinburgh, Edinburgh, EH9 3FE, UK)

[SVC41-P06] Boninite ascent rates constrained using chromite crystal chemistry: Observations of experimental products applied to the extrusive sequence of the Troodos Ophiolite

*Daniel Coulthard1, Georg F Zellmer1, Sebastien Jego2, Akihiko Tomiya3 (1.Volcanic Risk Solutions, Massey University, Palmerston North, New Zealand, 2.Institut des Sciences de la Terre d'Orleans, Centre National de la Recherche Scientifique, Universite d'Orleans, Orleans, France, 3.Geological Survey of Japan, Advanced Institute of Science and Technology, Tsukuba, Japan)