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PRESSURE AND TEMPERATURE DEPENDENCE OF VISCOSITY OF VOLCANIC LAVA

AUTHOR/S: I. AVRAMOV
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 137-142 pp

ABSTRACT

We consider a model of viscosity η of volcanic lavas. The equation, describes with high
accuracy the existing experimental data on temperature and pressure dependence of
viscosity of igneous materials. It is demonstrated that, the activation energy E(Tg) can
be expressed through the glass transition temperature Tgo. The dependencies of the
parameters of the viscosity equation are discussed for most of geoscientifically relevant
systems.
According to the model viscosity of lava depends on the depth inside the Earth through
the temperature and pressure. Therefore, the viscosity of lava at the surface could be
both lower and higher the one in the bowels of the earth, depending on the composition.
This is of major importance for the volcano erruptions.

Keywords: viscosity, pressure dependence, glasses, mantle properties, lava

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