A POSSIBLE EFFECT OF MELT STRUCTURE ON THE MG-FE2+ PARTITIONING BETWEEN OLIVINE AND MELT
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dc.contributor.author | Kushiro I. | |
dc.contributor.author | Mysen B.O. | |
dc.date.accessioned | 2021-04-19T02:32:52Z | |
dc.date.available | 2021-04-19T02:32:52Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1091307 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 12, 2267-2272 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28039 | |
dc.description.abstract | Partitioning of Mg and Fe2+ between olivine and mafic melts has been determined experimentally for eight different synthetic compositions in the temperature range between 1335 and 1425°C at 0.1 MPa pressure and at fo2 ~1 log unit below the quartz-fayalite-magnetite buffer. The partition coefficient [KD = (Fe2+/Mg)°l/(Fe2+/Mg)melt] increases from 0.25 to 0.34 with increasing depolymerization of melt (NBO/T of melt from 0.25-1.2), and then decreases with further depolymerization of melt (NBO/T from 1.2-2.8). These variations are similar to those observed in natural basalt-peridotite systems. In particular, the variation in NBO/T ranges for basaltic-picritic melts (0.4-1.5) is nearly identical to that obtained in the present experiments. Because the present experiments were carried out at constant pressure (0.1 MPa) and in a relatively small temperature range (90°C), the observed variations of Mg and Fe2+ partitioning between olivine and melt must depend primarily on the composition or structure of melt. Such variations of KD may depend on the relative proportions of four-, five-, and six-coordinated Mg2+ and Fe2+ in melt as a function of degree of NBO/T. | |
dc.title | A POSSIBLE EFFECT OF MELT STRUCTURE ON THE MG-FE2+ PARTITIONING BETWEEN OLIVINE AND MELT | |
dc.type | Статья |
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