Oxygen and silicon self-diffusion in natural olivine at T = 1300°C

Details Oxygen and silicon self-diffusion in natural olivine at T = 1300°C Oxygen and silicon self-diffusion in natural olivine at T = 1300°C

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...50..240h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 50, Issue 3, p. 240-250.

Physics

24

Scientific paper

Oxygen and silicon self-diffusion in natural olivine single crystals (Mg0.89 Fe0.11)2 SiO4 from San Carlos, Arizona, have been measured for the first time at T = 1300°C in controlled oxygen partial pressure pO2 ranging from 10-4 to 10 Pa. Polished and chemically-etched specimens were heated for several hours in a gas mixture H2/CO2 or H2/H218O. The latter gas mixture provides both the controlled pO2 and the isotopic reservoir for the 18O diffusion across the gas-solid interface. For 30Si diffusion, a thin layer of isotopic forsterite Mg230SiO4 (few hundreds of angstroms) was deposited onto the olivine surface. Diffusion profiles for oxygen and silicon were determined using the nuclear reaction 18O(p,α)15N and Rutherford back-scattering of 2 MeV α particles, respectively. The diffusion coefficients are Dox = 10-18 +/- 0.6m2s-1 for oxygen and DSi = 10-20m2s-1 for silicon. We conclude from these measurements on San Carlos olivine at T = 1300°C that: (1) Si is the slowest diffusing species in natural olivine, as it is in forsterite, and (2) 30Si and 18O diffuse 30 to 200 times faster in olivine than in forsterite.

Affiliated with

Also associated with

No associations

Rating

Oxygen and silicon self-diffusion in natural olivine at T = 1300°C 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 Oxygen and silicon self-diffusion in natural olivine at T = 1300°C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen and silicon self-diffusion in natural olivine at T = 1300°C will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-850656