Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning

Details Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.3121m&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 70, Issue 12, p. 3121-3138.

Computer Science

6

Scientific paper

Olivine/melt partitioning of ΣFe, Fe2+, Mg2+, Ca2+, Mn2+, Co2+, and Ni2+ has been determined in the systems CaO MgO FeO Fe2O3 SiO2 (FD) and CaO MgO FeO Fe2O3 Al2O3 SiO2 (FDA3) as a function of oxygen fugacity (f) at 0.1 MPa pressure. Total iron oxide content of the starting materials was ˜20 wt%. The f was to used to control the Fe3+/ΣFe (ΣFe: total iron) of the melts. The Fe3+/ΣFe and structural roles of Fe2+ and Fe3+ were determined with 57Fe resonant absorption Mössbauer spectroscopy. Changes in melt polymerization, NBO/T, as a function of f was estimated from the Mössbauer data and existing melt structure information. It varies by ˜100% in melts coexisting with olivine in the FDA3 system and by about 300% in the FD system in the Fe3+/ΣFe range of the experiments (0.805 0.092). The partition coefficients (Diol-melt=wt% in olivine/wt% in melt) are systematic functions of f and, therefore, NBO/T of the melt. There is a Diol-melt-minimum in the FDA3 system at NBO/T-values corresponding to intermediate Fe3+/ΣFe (0.34 0.44). In the Al-free system, FD, where the NBO/T values of melts range between ˜1 and ˜2.9, the partition coefficients are positively correlated with NBO/T (decreasing Fe3+/ΣFe). These relationships are explained by consideration of solution behavior in the melts governed by Qn-unit distribution and structural changes of the divalent cations in the melts (coordination number, complexing with Fe3+, and distortion of the polyhedra).

Affiliated with

Also associated with

No associations

Rating

Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning 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 Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Redox equilibria of iron and silicate melt structure: Implications for olivine/melt element partitioning will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1060455