THE MN, MG-INTRACRYSTALLINE EXCHANGE REACTION IN DONPEACORITE (MN0.54CA0.03MG1.43SI2O 6) AND ITS RELATION TO THE FRACTIONATION BEHAVIOR OF MN IN FE, MG-ORTHOPYROXENE
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dc.contributor.author | Stimpfl M. | |
dc.date.accessioned | 2023-12-16T06:35:05Z | |
dc.date.available | 2023-12-16T06:35:05Z | |
dc.date.issued | 2005 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=27975642 | |
dc.identifier.citation | American Mineralogist, 2005, 90, 1, 155-161 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/42336 | |
dc.description.abstract | The equilibrium intracrystalline distribution of Mn and Mg between the M1 and M2 sites of a Mn-rich/Fe-free orthopyroxene (donpeacorite) was investigated by means of annealing experiments at temperatures between 980 and 800 °C and single-crystal X-ray diffraction. The data show that Mn, as does Fe2+ in Fe-Mg orthopyroxene, preferentially orders at the M2 site. However, comparison of the distribution coefficient kD(Mn-mg) determined in this study with k D* measured for Fe-Mg orthopyroxene shows that Mn has a much stronger preference for the M2 site relative to Fe 2+. This result implies that the practice to partition Fe2+ + Mn = Fe* as one species, typically implemented to determine the quenched-site occupancies in Fe-rich /Mn-poor orthopyroxene, should be abandoned and that Mn should be considered totally ordered at M2. The partitioning method, i.e., Fe vs. Fe*, has implications for the determination of cooling rates from the observed ordering state of orthopyroxene, particularly for Fe-poor compositions (Fs <0.16). | |
dc.title | THE MN, MG-INTRACRYSTALLINE EXCHANGE REACTION IN DONPEACORITE (MN0.54CA0.03MG1.43SI2O 6) AND ITS RELATION TO THE FRACTIONATION BEHAVIOR OF MN IN FE, MG-ORTHOPYROXENE | |
dc.type | Статья | |
dc.identifier.doi | 10.2138/am.2005.1577 |
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