MILDLY INCOMPATIBLE ELEMENTS IN PERIDOTITES AND THE ORIGINS OF MANTLE LITHOSPHERE
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dc.contributor.author | Canil D. | |
dc.date.accessioned | 2022-10-03T05:50:59Z | |
dc.date.available | 2022-10-03T05:50:59Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=13871026 | |
dc.identifier.citation | Lithos, 2004, 77, 1-4 SPEC. ISS., 375-393 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38890 | |
dc.description.abstract | The abundances of the mildly incompatible elements Al, Cr, V, Sc and Yb in more than 1700 mantle peridotite bulk rock analyses are interpreted in the light of a fractional melting model based on experimentally measured partition coefficients (D) and melting reaction stoichiometries. All peridotites examined, irrespective of sample type (abyssal peridotites, orogenic massifs, ophiolites, on/off craton xenoliths), tectonic environment (divergent/convergent/passive margin, intraplate) or the pressure (P) they last equilibrated at in the mantle (plagioclase-, spinel- , or garnet facies), originated as residues at less than 3 GPa, mainly within the spinel-facies. Mantle rocks currently in the garnet facies likely were originally spinel-facies lithosphere underthrust or subducted to greater depths in convergent margins. This view is inescapable even within the widest range of D values employed in the calculations, and is furthermore strengthened when metasomatic effects on the abundances of the mildly incompatible elements in residues are considered. A pressure of origin of below ∼3 GPa for most mantle lithosphere creates difficulties for any model ascribing a significant volume of deep, cratonic mantle roots to plume sub-cretion or any other vertical tectonic mechanism. | |
dc.subject | Mantle | |
dc.subject | Lithosphere | |
dc.subject | Peridotite | |
dc.subject | Melting | |
dc.subject | Trace element | |
dc.subject | Geochemistry | |
dc.subject | Modeling | |
dc.title | MILDLY INCOMPATIBLE ELEMENTS IN PERIDOTITES AND THE ORIGINS OF MANTLE LITHOSPHERE | |
dc.type | Статья |
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