Chapter 2 Melt Migration and Related Attenuation in Equilibrated Partial Melts (original) (raw)

International Geophysics, 1994

Abstract

Publisher Summary This chapter discusses melt migration and related attenuation in equilibrated partial melts. Anelasticity associated with the migration of the melt phase in synthetic olivine–basalt partial melts is examined experimentally in this chapter. Newtonian-viscous, texturally (quasi)equilibrated partial-melt aggregates were subjected to four-point flexural loading at elevated temperature (1070–1200°C); the creep response was characterized by a substantial, decelerating transient. The fact that melt-free grain boundaries characterize the steady-state microstructure of partial melts of upper-mantle composition supports the idea that dilatational anelasticity may be the unique dynamic signature of partial melting under conditions that produce a low melt fraction and that disallow the fracture of the crystalline residuum. The melt-migration attenuation effect noted in the experiments is sensitive to the magnitude of applied strain because of the coupling of the melt migration to the deformation kinetics of the crystalline residuum. Thus, further experimentation into the attenuation behavior of partial melts at seismic/subseismic frequencies requires working at low-strain amplitudes.

Reid Cooper hasn't uploaded this paper.

Let Reid know you want this paper to be uploaded.

Ask for this paper to be uploaded.