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• W2029540114 endingPage "602" @default.
• W2029540114 startingPage "591" @default.
• W2029540114 abstract "Geochemical modeling of the origin of enriched mantle I (EMI) and enriched mantle II (EMII) is conducted from the perspective of adakite production. For the model, the average composition of adakites is re-estimated from published data for eighteen trace elements. Although the concentrations determined for highly incompatible elements are very high (about 100 times of primitive mantle), these high concentrations can be explained by melting of oceanic crust without sediment contribution. The compiled data further suggest that the mantle–slab melt reaction would play a major role in the production of basic adakites. In addition, crystal fractionation in the magma chamber should produce additional chemical variations in adakites, in particular for acidic adakites. To examine the effect of chemical variations on the isotopic composition of recycled adakites, broad correlations between trace elements and SiO2 concentrations, and the MELTS program are employed. The results suggest that recycling of a basic adakite (SiO2 = 55%) can account for EMI isotopic signatures with storage times of about 2.0 Gyr. The isotopic compositions of less-basic adakites and their evolved magmas shift towards EMII values with increasing SiO2 concentrations. In particular, evolved acidic adakite can yield EMII isotopic signatures. These lines of evidence suggest that the recycling of adakites at various stages of evolution can conceivably produce the entire isotopic range between EMI and EMII reservoirs. Consequently, adakite recycling via sediment subduction or subduction erosion can account for the origins of EMI and EMII reservoirs. In this context, residual garnet under high pressure and plagioclase fractionation at low pressure might play an essential role in producing the chemical variations among adakites that ultimately govern the isotopic compositions of these geochemical reservoirs." @default.
• W2029540114 created "2016-06-24" @default.
• W2029540114 creator A5009246535 @default.
• W2029540114 date "2009-10-01" @default.
• W2029540114 modified "2023-10-16" @default.
• W2029540114 title "Genetic link between EMI and EMII: An adakite connection" @default.
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• W2029540114 doi "https://doi.org/10.1016/j.lithos.2009.05.025" @default.
• W2029540114 hasPublicationYear "2009" @default.
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