Mechanical Spectroscopy on Volcanic Glasses

Details Mechanical Spectroscopy on Volcanic Glasses Mechanical Spectroscopy on Volcanic Glasses

2005-07-25

arxiv.org/abs/cond-mat/0507559v3

Physics

Condensed Matter

Disordered Systems and Neural Networks

52 pages, 20 figures

Scientific paper

Mechanical relaxation behaviour of various natural volcanic glasses have been investigated in the temperature range RT-1200K using special low frequency flexure (f~0.63Hz) pendulum experiments. The rheological properties complex Young's modulus M* and internal friction 1/Q have been studied from a pure elastic solid at room temperature to pure viscous melt at log(eta[Pas])=8. Several relaxation processes are assumed to act: the primary alpha-relaxation (viscoelastic process, E_a=(344...554)kJ/mol) above the glass transition temperature T_g=(935...1105)K and secondary anelastic beta', beta and gamma-relaxation processes below T_g. With a simple fractional Maxwell model with asymmetrical relaxation time distribution, phenomenological the mechanical relaxation behaviour, is described. This establish a basis of realistic concepts for modelling of volcanic or magmatic processes.

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