Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions

Details Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.287..229z&link_type=abstract

Earth and Planetary Science Letters, Volume 287, Issue 1-2, p. 229-240.

Mathematics

Logic

4

Scientific paper

High-temperature, high-pressure triaxial compressive creep experiments were carried out on polycrystalline samples of olivine, (FexMg1 - x)2SiO4, with x ≡ Fe/(Fe + Mg) = 1.0, 0.75, 0.5, and 0.3 to investigate the influence of Fe content on rheological properties of olivine under anhydrous conditions. Samples with grain sizes of < 50 μm were deformed at differential stresses of 50 to 300 MPa primarily in the dislocation-accommodated grain boundary sliding creep regime for temperatures between 1273 and 1473 K with a confining pressure of 300 MPa. Our results, combined with published results on aggregates of Fa10, demonstrate that samples of Fa30, Fa50, Fa75, and Fa100 creep ~ 15, ~ 75, ~ 365, and ~ 1480 times faster than samples of Fa10, respectively, under the same conditions. Our experimental results can be described by the flow law ɛ˙=ɛ˙gbs0(σ(bXFapexp(-Qgbso+αXRT)with ɛ˙gbs0=(6.2±5.2)×105s-1,n=3.9, p = 1.5 ± 0.1, Qgbs0 = 440 ± 10 kJ/mol, and α = - 45 ± 4 kJ/mol. Based on measured dependence of strain rate on iron concentration, we conclude that, at the same thermodynamic conditions, the Martian mantle, which is more rich in Fe than Earth's mantle, will be a factor of ~ 10 less viscous than Earth's mantle.

Affiliated with

Also associated with

No associations

Rating

Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions 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 Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1334687