Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов
Rare earth element (REE) abundances in clinopyroxene and garnet from xenoliths entrained by kimberlites of the Kaapvaal craton, South Africa, and the Somerset Island, Canada, show a strong and species-dependent variation vs. pressure in a depth range of 70 to 200 km. As a result, the interelement ra...
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| Datum: | 2007 |
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| Format: | Artikel |
| Sprache: | Russisch |
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Видавничий дім "Академперіодика" НАН України
2007
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| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/2442 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов / О.В. Арясова, Я.М. Хазан // Доп. НАН України. — 2007. — N 8. — С. 110-115. — Бібліогр.: 15 назв. — рос. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862673231477997568 |
|---|---|
| author | Арясова, О.В. Хазан, Я.М. |
| author_facet | Арясова, О.В. Хазан, Я.М. |
| citation_txt | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов / О.В. Арясова, Я.М. Хазан // Доп. НАН України. — 2007. — N 8. — С. 110-115. — Бібліогр.: 15 назв. — рос. |
| collection | DSpace DC |
| description | Rare earth element (REE) abundances in clinopyroxene and garnet from xenoliths entrained by kimberlites of the Kaapvaal craton, South Africa, and the Somerset Island, Canada, show a strong and species-dependent variation vs. pressure in a depth range of 70 to 200 km. As a result, the interelement ratios of the REE vary across the upper mantle. This effect can be referred to as a REE large-scale space fractionation. Based upon a strong correlation between the activation energies of the REE diffusion in clinopyroxene, and the logarithmic slopes Γ of the abundance vs. pressure dependence, Γ = –d log C(P)/dP, we speculate that the space fractionation had accompanied mantle melting events and was due to a nonequilibrium REE partition between the melt and the solid residue. A simplified model of the mantle partial melting, which takes into account a PT dependent diffusive exchange between the melt and the multimineral solid residue and a non-modal character of peridotite melting indicates that the observed strong fractionation is resulted from a high degree (10–20%) partial melting of a depleted peridotite (a few wt% of clinopyroxene).
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| first_indexed | 2025-12-07T15:38:10Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-2442 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1025-6415 |
| language | Russian |
| last_indexed | 2025-12-07T15:38:10Z |
| publishDate | 2007 |
| publisher | Видавничий дім "Академперіодика" НАН України |
| record_format | dspace |
| spelling | Арясова, О.В. Хазан, Я.М. 2008-10-10T11:53:18Z 2008-10-10T11:53:18Z 2007 Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов / О.В. Арясова, Я.М. Хазан // Доп. НАН України. — 2007. — N 8. — С. 110-115. — Бібліогр.: 15 назв. — рос. 1025-6415 https://nasplib.isofts.kiev.ua/handle/123456789/2442 552.323 Rare earth element (REE) abundances in clinopyroxene and garnet from xenoliths entrained by kimberlites of the Kaapvaal craton, South Africa, and the Somerset Island, Canada, show a strong and species-dependent variation vs. pressure in a depth range of 70 to 200 km. As a result, the interelement ratios of the REE vary across the upper mantle. This effect can be referred to as a REE large-scale space fractionation. Based upon a strong correlation between the activation energies of the REE diffusion in clinopyroxene, and the logarithmic slopes Γ of the abundance vs. pressure dependence, Γ = –d log C(P)/dP, we speculate that the space fractionation had accompanied mantle melting events and was due to a nonequilibrium REE partition between the melt and the solid residue. A simplified model of the mantle partial melting, which takes into account a PT dependent diffusive exchange between the melt and the multimineral solid residue and a non-modal character of peridotite melting indicates that the observed strong fractionation is resulted from a high degree (10–20%) partial melting of a depleted peridotite (a few wt% of clinopyroxene). ru Видавничий дім "Академперіодика" НАН України Науки про Землю Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов Article published earlier |
| spellingShingle | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов Арясова, О.В. Хазан, Я.М. Науки про Землю |
| title | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| title_full | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| title_fullStr | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| title_full_unstemmed | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| title_short | Крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| title_sort | крупномасштабное фракционирование редкоземельных элементов в мантии кратонов |
| topic | Науки про Землю |
| topic_facet | Науки про Землю |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/2442 |
| work_keys_str_mv | AT arâsovaov krupnomasštabnoefrakcionirovanieredkozemelʹnyhélementovvmantiikratonov AT hazanâm krupnomasštabnoefrakcionirovanieredkozemelʹnyhélementovvmantiikratonov |