Seismic anisotropy in subduction zones and lattice-preferred orientation of olivine
نویسندگان
چکیده
منابع مشابه
Seismic Anisotropy in Salt Structures Due to Preferred Crystal Orientation
LÕanalyse de la texture du sel gemme naturel et du halite dform exprimentalement a montr quÕil se produit une orientation prfrentiel le du rseau dans les cristaux de halite. Les paramtres dÕlasticit pour une srie dÕagrgats polycristallins de halite sont calculs en utilisant les fonctions de distribution dÕorientation. Ils sont alors utiliss pour laborer des modles sismiques dans...
متن کاملWater-induced fabric transitions in olivine.
The interpretation of seismic anisotropy in Earth's upper mantle has traditionally been based on the fabrics (lattice-preferred orientation) of relatively water-poor olivine. Here we show that when a large amount of water is added to olivine, the relation between flow geometry and seismic anisotropy undergoes marked changes. Some of the puzzling observations of seismic anisotropy in the upper m...
متن کاملConstraints on Subduction Geodynamics from Seismic Anisotropy
[1] Much progress has been made over the past several decades in delineating the structure of subducting slabs, but several key aspects of their dynamics remain poorly constrained. Major unsolved problems in subduction geodynamics include those related to mantle wedge viscosity and rheology, slab hydration and dehydration, mechanical coupling between slabs and the ambient mantle, the geometry o...
متن کاملEffect of water and stress on the lattice-preferred orientation of olivine
The influence of water and stress on the lattice-preferred orientation (LPO) of olivine aggregates was investigated through large strain, shear deformation experiments at high pressures and temperatures (P=0.5–2.1 GPa, T=1470–1570 K) under both waterpoor and water-rich conditions. The specimens are hot-pressed synthetic olivine aggregates or single crystals of olivine. Water was supplied to the...
متن کاملEvolution of olivine lattice preferred orientation during simple shear in the mantle
Article history: Understanding the variatio Received 16 November 2007 Received in revised form 14 March 2008 Accepted 25 March 2008 Available online 22 April 2008 Editor: R.D. van der Hilst
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ژورنال
عنوان ژورنال: Japanese Magazine of Mineralogical and Petrological Sciences
سال: 2010
ISSN: 1349-7979,1345-630X
DOI: 10.2465/gkk.39.12