MELT STRUCTURAL CONTROL ON OLIVINE/MELT ELEMENT PARTITIONING OF CA AND MN
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dc.contributor.author | Mysen B.O. | |
dc.contributor.author | Dubinsky E.V. | |
dc.date.accessioned | 2022-03-23T07:44:03Z | |
dc.date.available | 2022-03-23T07:44:03Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=12090621 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2004, 68, 7, 1617-1633 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36549 | |
dc.description.abstract | Relationships between mineral/silicate melt partition coefficients and melt structure have been examined by combining Ca and Mn olivine/melt partitioning data with available melt structure information. Compositions were chosen so that melts with olivine on their liquidii range in degree of polymerization, NBO/T, from ∼0.5 to ∼2.5 under near isothermal conditions (1350–1400°C). Olivine/melt Ca-Mn exchange coefficients, Ca(olivine)/CaO(melt)/MnO(olivine)/MnO(melt) (KD Ca-Mnolivine/melt), as a function of melt NBO/T have a parabolic shape with a minimum KD Ca-Mnolivine/melt-value at NBO/T near 1. Notably, published KD Fe2+-Mgolivine/melt versus NBO/T functions are also parabolic with a maximum in KD Fe2+-Mgolivine/melt near 1 (Kushiro and Mysen, 2002).The olivine/melt partitioning data are modeled in terms of structural units (Qn-species) in the melt. The NBO/T-value corresponding to the minimum KD Ca-Mnolivine/melt is near that where the abundance ratio of Qn-species, XQ3/XQ2, has its largest value. Therefore, the activity coefficient ratio in the melt, γCa2+(melt)/γMn2+(melt), attains a minimum where the abundance ratio of XQ3/XQ2 is at maximum. It is inferred from this relationship that Ca2+ in the melts is dominantly bonded to nonbridging oxygen (Ca-NBO) in Q3-species, whereas Mn2+ is bonded to nonbridging oxygen (Mn-NBO) in less polymerized Qn-species such as Q2. | |
dc.title | MELT STRUCTURAL CONTROL ON OLIVINE/MELT ELEMENT PARTITIONING OF CA AND MN | |
dc.type | Статья |
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