Water-Induced Fabric Transitions in Olivine

Author:

Jung Haemyeong1,Karato Shun-ichiro1

Affiliation:

1. University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN 55455, USA.

Abstract

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 mantle, including the anomalous anisotropy in the central Pacific and the complicated anisotropy in subduction zones, can be attributed to the enrichment of water in these regions.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference47 articles.

1. A. Nicolas N. I. Christensen in Composition Structure and Dynamics of the Lithosphere-Asthenosphere System K. Fuchs C. Froidevaux Eds. (American Geophysical Union Washington DC 1987) p. 111.

2. Lattice preferred orientation of olivine aggregates deformed in simple shear

3. An olivine fabric database: an overview of upper mantle fabrics and seismic anisotropy

4. Most of the peridotite samples are from the lithosphere and contain relatively low water content (31) probably due to partial melting of the samples (32 33). Also the recent experimental studies with a high-resolution gas-medium apparatus are made at low confining pressures (<0.5 GPa) and therefore the water content in olivine is low [∼200 parts per million (ppm) H/Si] as compared with that in the asthenosphere [∼800 to 3000 ppm H/Si (34)]. The higher end of this estimate corresponds to subduction zone upper mantle and the lower end to source regions of mid-oceanic ridge basalt.

5. Ekström G., Dziewonski A. M., Nature 394, 168 (1998).

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