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- W2132213038 abstract "Cratonic eclogites play an important role in the formation and dynamic evolution of the subcontinental lithospheric mantle. However, their origin, whether as fragments of subducted oceanic crust or high-pressure mantle cumulates, remains controversial. Here, we report Mg isotopic compositions (δ26Mg) for cratonic eclogites from Kaalvallei and Bellsbank kimberlite pipes, South Africa. We find that clinopyroxene is 0.375±0.069 to 0.676±0.075‰ heavier than coexisting garnet, which reflects equilibrium isotope fractionation between these phases, primarily driven by the difference in Mg coordination between clinopyroxene and garnet. Bulk eclogites have strikingly variable Mg isotopic compositions, which range from −0.797±0.075 to −0.139±0.061‰, values that are significantly lighter than the range displayed by global mantle peridotites to date (−0.25±0.07‰, 2SD). As significant Mg isotope fractionation is only known to occur during low-temperature water–rock interaction, our results provide further evidence for the derivation of cratonic eclogites from subducted altered oceanic crust. In addition, the lack of correlation between Δ26Mg and Δ57Fe provides evidence for redox control on equilibrium inter-mineral Fe isotope fractionation." @default.
- W2132213038 created "2016-06-24" @default.
- W2132213038 creator A5042538052 @default.
- W2132213038 creator A5057024119 @default.
- W2132213038 creator A5084904811 @default.
- W2132213038 creator A5087061864 @default.
- W2132213038 date "2012-12-01" @default.
- W2132213038 modified "2023-10-09" @default.
- W2132213038 title "Magnesium isotopic variations in cratonic eclogites: Origins and implications" @default.
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- W2132213038 doi "https://doi.org/10.1016/j.epsl.2012.10.016" @default.
- W2132213038 hasPublicationYear "2012" @default.
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