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• W2138030811 abstract "Xenoliths from the upper mantle have undergone a wide variety of processes at varied temperatures and pressures, as recorded by mineral compositions and textures. Eclogite xenoliths in kimberlites are a unique source from which to obtain information about such processes. Furthermore, eclogites that contain accessory diamond yield important compositional constraints on the deeper upper mantle. Whether eclogites have mantle or crustal origins is still a subject of controversy. Mineralogy and petrography of 29 eclogite xenoliths from the Udachnaya kimberlite in Yakutia, Siberia are presented and combined with previous studies of these eclogites by our group (Jerde et al., 1993, 1994; Snyder et al., 1993a; Sobolev et al., 1994). Five different petrographic groups are defined, based on texture, mineral color, and degree of alteration. Chemical compositions of eclogitic minerals span a complete range from high to low-jadeite content in clinopyroxenes and from pyrope-almandine to grossular in garnets. Eclogites appear to behave systematically in terms of Kd (Fe/Mg) values. Two eclogites (U-25/84 and U-281/84) are classified as Group A eclogites as per Coleman et al. (1965) and Taylor and Neal (1989). These two samples are unusual in chemical composition, being enriched in Cr2O3 (up to 64% of pyrope component in garnet). There is no evidence that points definitively to a crustal origin for the Udachnaya eclogites but there is abundant evidence that is at least consistent with a mantle origin: (a) oxygen isotope (δ18O) values of individual minerals that vary from 4.8 to 7.0 (Jerde et al., 1993); (b) carbon isotope values in diamonds, which are not indicative of a biogenic, crustally derived component; (c) extremely low87Sr/86Sr values, which suggest a long-lived, depleted (low Rb/Sr) component consistent with upper mantle, as well as very old reconstructed whole-rock model ages; and (d) reconstructed whole-rock εNd values (at 389 Ma) for U-24/84 and U-281/84 of +4.3 and +6.7, respectively, indicative of a depleted peridotite protolith. The distinct correlations between δ18O and CaO, FeO, etc. reported by Jacob et al. (1993) do not exist with our much larger data base. We do not agree with their conclusions that all eclogites in Siberia, as well as South Africa, are the result of subducted oceanic crust. Although there may be a crustal component (i.e., δ18O = 7.02) in some of the Udachnaya eclogites, the majority are of mantle origin. It is clear that Yakutian eclogites possess distinctive differences from their South African counterparts (Bellsbank), some of which are thought to be derived from Archean oceanic crust." @default.
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• W2138030811 date "1994-01-01" @default.
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• W2138030811 title "Diamondiferous Eclogites from the Udachnaya Kimberlite Pipe, Yakutia" @default.
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• W2138030811 doi "https://doi.org/10.1080/00206819409465448" @default.
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