REDOX EQUILIBRIA OF IRON AND SILICATE MELT STRUCTURE: IMPLICATIONS FOR OLIVINE/MELT ELEMENT PARTITIONING
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dc.contributor.author | Mysen B.O. | |
dc.date.accessioned | 2024-05-05T03:46:08Z | |
dc.date.available | 2024-05-05T03:46:08Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12091784 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 12, 3121-3138 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/43806 | |
dc.description.abstract | Olivine/melt partitioning of ?Fe, Fe2+, Mg2+, Ca2+, Mn2+, Co2+, and Ni2+ has been determined in the systems CaO-MgO-FeO-Fe2O3-SiO2 (FD) and CaO-MgO-FeO-Fe2O3-Al2 O3-SiO2 (FDA3) as a function of oxygen fugacity (fO2) at 0.1 MPa pressure. Total iron oxide content of the starting materials was ?20 wt%. The fO2 was to used to control the Fe3+/?Fe (?Fe: total iron) of the melts. The Fe3+/?Fe and structural roles of Fe2+ and Fe3+ were determined with 57Fe resonant absorption M?ssbauer spectroscopy. Changes in melt polymerization, NBO/T, as a function of fO2 was estimated from the M?ssbauer 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+/?Fe range of the experiments (0.805-0.092). The partition coefficients (Diol - melt = wt % in olivine/wt% in melt) are systematic functions of fO2 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+/?Fe (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+/?Fe). 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). ? 2006 Elsevier Inc. All rights reserved. | |
dc.subject | FUGACITY | |
dc.subject | IRON OXIDE | |
dc.subject | MOSSBAUER SPECTROSCOPY | |
dc.subject | REDOX CONDITIONS | |
dc.subject | SILICATE MELT | |
dc.title | REDOX EQUILIBRIA OF IRON AND SILICATE MELT STRUCTURE: IMPLICATIONS FOR OLIVINE/MELT ELEMENT PARTITIONING | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2006.03.014 |
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