Computer Science
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.348..628r&link_type=abstract
Nature (ISSN 0028-0836), vol. 348, Dec. 13, 1990, p. 628-631. Research supported by NERC and NASA.
Computer Science
25
Body Centered Cubic Lattices, Earth Mantle, Face Centered Cubic Lattices, Magnesium Compounds, Phase Transformations, Silicates, High Pressure, High Temperature, Microstructure, Olivine, Shear Strength, Subduction (Geology)
Scientific paper
The results of experiments on the phase transformation of Mg2SiO4 olivine at 15 GPa pressure in a multianvil cell are reported. At this pressure and a temperature of 900 C, early formed metastable gamma-spinel transforms partially to the beta-phase. The observed microstructures, which are similar to those in shocked meteorites, show that the gamma-to-beta transformation can occur either by diffusion-controlled growth or by a martensitic mechanism, depending on how far the pressure-temperature conditions deviate from their values at phase equilibrium. The results suggest that the diffusion-controlled mechanism is most likely to operate at the beta/gamma phase boundary in the mantle, but martensitic beta-to-gamma transformation might occur in subduction zones and could reduce the shear strength of the subducting slab.
Brearley Adrian J.
Rubie David C.
No associations
LandOfFree
Mechanism of the gamma-beta phase transformation of Mg2SiO4 at high temperature and pressure does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mechanism of the gamma-beta phase transformation of Mg2SiO4 at high temperature and pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mechanism of the gamma-beta phase transformation of Mg2SiO4 at high temperature and pressure will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1633384