PETROGENESIS OF GROUP A ECLOGITES AND WEBSTERITES: EVIDENCE FROM THE OBNAZHENNAYA KIMBERLITE, YAKUTIA
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dc.contributor.author | Taylor L.A. | |
dc.contributor.author | Snyder G.A. | |
dc.contributor.author | Keller R. | |
dc.contributor.author | Remley D.A. | |
dc.contributor.author | Anand M. | |
dc.contributor.author | Wiesli R. | |
dc.contributor.author | Valley J. | |
dc.contributor.author | Sobolev N.V. | |
dc.date.accessioned | 2021-11-21T03:19:35Z | |
dc.date.available | 2021-11-21T03:19:35Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13419267 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2003, 145, 4, 424-443 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32266 | |
dc.description.abstract | Mantle xenoliths from the Obnazhennaya kimberlite pipe, Yakutia, possess a large range of mineralogical and chemical compositions, from both group A and B eclogites. Major-element contents of the group A eclogites exhibit transitional features between the group B eclogites and peridotite. The Mg# of clinopyroxenes is 0.86–0.94, with 0.60–0.84 for garnets. Differences in concentration of LREEs exist between the Obnazhennaya group A and the well-studied group B eclogites from the Udachnaya kimberlite pipe. In general, garnets in the group A eclogites contain lower LREEs than those from the group B eclogites; however, the trend for clinopyroxene is reversed. High δ 18O (5.46–7.81) values, and the positive Eu anomalies in the garnets and clinopyroxenes (Eu/Eu* 1.2–1.4) demonstrate the involvement of an oceanic crustal component in the formation of the group A eclogites. The group A eclogites formed between 21.0 and 37.6 kbar, and 711 and 923 °C, in a time interval of 1,071–1,237 Ma. An innovative model is proposed to explain the formation of the group A eclogites and websterites. It involves the reaction of a depleted mantle peridotite with TTG and carbonatite melts closely related to the subduction of oceanic crust. | |
dc.title | PETROGENESIS OF GROUP A ECLOGITES AND WEBSTERITES: EVIDENCE FROM THE OBNAZHENNAYA KIMBERLITE, YAKUTIA | |
dc.type | Статья |
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