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Non‐Newtonian viscosity of basaltic magma
Author(s) -
Sonder I.,
Zimanowski B.,
Büttner R.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl024240
Subject(s) - basalt , viscosity , rheology , magma , volcanism , newtonian fluid , geology , non newtonian fluid , volcano , thermodynamics , petrology , geophysics , geochemistry , physics , geotechnical engineering , seismology , tectonics
Basaltic melt drives most of earth's volcanism. Understanding its rheology is crucial for any model of magma transport and volcanic eruption. Basaltic magma is generally treated as a quasi Newtonian liquid, but there are observations of Non‐Newtonian behaviour. With a method, that allows measurement of Non‐Newtonian viscosity of a representative melt (molten basaltic rock), we found a strong shear rate dependency of viscosity in a wide range of temperatures. The temperature‐viscosity dependency indicates properties of the molten phase as the cause. The viscosity data are in good agreement with a power law model.