Mg Fe partitioning between olivine and ultramafic melts at high pressures

Details Mg Fe partitioning between olivine and ultramafic melts at high pressures Mg Fe partitioning between olivine and ultramafic melts at high pressures

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70..757m&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 70, Issue 3, p. 757-766.

Computer Science

7

Scientific paper

Precise determination of the partitioning of Mg and Fe2+ between olivine and ultramafic melt has been made at pressures from 5 to 13 GPa using a MA-8 type multi-anvil high-pressure apparatus (PREM) installed at Earthquake Research Institute, University of Tokyo. A very short rhenium capsule (<100 μm sample thickness) was adopted to minimize temperature variation within the sample container. Synthetic gels with the composition of the upper mantle peridotite were used as starting materials to promote the homogeneity. Analyses of quenched melts and coexisting olivines were made with an electron probe microanalyzer. The obtained partition coefficient, KD [=(FeO/MgO)ol/(FeO/MgO)melt], decreases from 0.35 to 0.25 with increasing pressure from 5 to 13 GPa, suggesting a negative correlation between pressure and KD above 5 GPa. Our result is consistent with a parabolic relationship between KD and degree of polymerization (NBO/T) of melts reported by previous studies at lower pressures. The negative correlation between pressure and KD suggests that olivine crystallizing in a magma ocean becomes more Mg-rich with depth and that primary magmas generated in the upper mantle become more Fe-rich with depth than previously estimated.

Affiliated with

Also associated with

No associations

Rating

Mg Fe partitioning between olivine and ultramafic melts at high pressures 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 Mg Fe partitioning between olivine and ultramafic melts at high pressures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mg Fe partitioning between olivine and ultramafic melts at high pressures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1490184