Rheology and microstructure of experimentally deformed plagioclase suspensions - Archive ouverte HAL Access content directly
Journal Articles Geology Year : 2011

Rheology and microstructure of experimentally deformed plagioclase suspensions

(1) , (1) , (1) , (1) , (2)
1
2

Abstract

We present the result of the first deformation experiments at high-temperatures and high-pressures on synthetic magmatic suspensions of strongly anisometric particles. The results highlight the interplay between the rheological response and the development of microstructures and they demonstrate the critical importance of the shape of crystals on the mechanical behaviour of magmas. Plagioclase suspensions with two crystal fractions (0.38 and 0.52) were deformed both in compression and in torsion in a Paterson apparatus. With increasing crystal fraction, the rheological behaviour of the magmatic suspension evolves from nearly steady-state flow to shear weakening, this change being correlated with a microstructural evolution from a pervasive strain to a strain partitioning fabric. Magmatic suspensions of plagioclase have viscosities approximately five orders of magnitude higher than suspensions of equivalent crystallinities made of isometric particles such as quartz.
Fichier principal
Vignette du fichier
Picard_et_al._2011_Geology.pdf (628.85 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

insu-00599580 , version 1 (10-06-2011)

Identifiers

Cite

David Picard, Laurent Arbaret, Michel Pichavant, Rémi Champallier, Patrick Launeau. Rheology and microstructure of experimentally deformed plagioclase suspensions. Geology, 2011, 39 (8), pp.747-750. ⟨10.1130/G32217.1⟩. ⟨insu-00599580⟩
246 View
328 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More