MANTLE ECLOGITES: EVIDENCE OF IGNEOUS FRACTIONATION IN THE MANTLE
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dc.contributor.author | Smyth J.R. | |
dc.contributor.author | Caporuscio F.A. | |
dc.contributor.author | McCormick T.C. | |
dc.date.accessioned | 2020-10-12T05:24:45Z | |
dc.date.available | 2020-10-12T05:24:45Z | |
dc.date.issued | 1989 | |
dc.identifier | https://elibrary.ru/item.asp?id=31448706 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1989, , 1, 133-141 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/17986 | |
dc.description.abstract | Despite recent geochemical studies advocating an origin of eclogite xenoliths in kimberlite by subduction of altered sea-floor basalts and crustal cumulates, there are numerous examples showing abundant exsolution of garnet and kyanite from clinopyroxene that could only have occurred on cooling from near-solidus temperatures at pressures in excess of 3 GPa. Samples showing extensive exsolution tend to have more calcic garnets and sodic pyroxenes than the average eclogite, but do not form a group that is geochemically distinct in major, minor, or trace elements. Also, composite samples containing both kyanite and bimineralic eclogites demonstrate the co-genetic relation of extremes of composition of the eclogite suite. Accordingly, we present an igneous fractionation model to account for the major and trace element variations observed in these rocks: grospydites and kyanite eclogites are early pyroxene, or pyroxeneplus-corundum, cumulates that have undergone extensive subsolidus exsolution of kyanite and garnet. These were then followed by more Fe-rich eclogites which had pyroxene plus garnet as solidus phases and fractionated towards more magnesian bimineralic eclogites. | |
dc.title | MANTLE ECLOGITES: EVIDENCE OF IGNEOUS FRACTIONATION IN THE MANTLE | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/0012-821X(89)90191-X |
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