Silicic lava effusion controlled by the transition from viscous magma flow to friction controlled flow

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5 Citations (Scopus)

Abstract

Silicic magma forms a vertical fault in volcanic conduits via the brittle-ductile transition. The formation of the fault changes flow type from viscous flow to friction controlled flow. Here we investigate flow dynamics of magma by coupling a one-dimensional conduit flow model with an experimentally calibrated brittle-ductile transition. The numerical simulation demonstrates that the length of magma plug at which friction controlled flow becomes the main flow type depends on magma flux, because of crystallization kinetics and the ductile-brittle transition. At high flux, a short plug forms, because nonequilibrium crystallization inhibits an increase of magma viscosity. This results in the effusion of less viscous lava and large shear stress at the shallow part of the conduit. In contrast, the long plug that forms under low flux cannot maintain large shear stress due to weakness of the magmatic fault, which causes the extrusion of a solidified lava spine.

Original languageEnglish
Pages (from-to)3608-3614
Number of pages7
JournalGeophysical Research Letters
Volume44
Issue number8
DOIs
Publication statusPublished - 2017 Apr 28

Keywords

  • brittle-ductile transition
  • friction controlled flow
  • lava effusion
  • magmatic fault
  • silicic magma
  • viscous flow

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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