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- W2052562167 abstract "The origin of the incompatible element-rich lunar component, KREEP, is in the Lunar Magma Ocean (LMO). The fractionated residual melt after crystallization of the LMO represents “urKREEP” (after Warren and Wasson, 1979). The percentage of this residual melt is low enough to be within the realm of silicate liquid immiscibility (SLI). This process has the ability to split the KREEP signature into K- and REEP-Fractions, which are manifest as lunar granite (K) and phosphate phases present in highland lithologies or as quartz ferrotroctolite in lunar soils (REEP). We envisage this as a localized, but significant process since only a small portion of urKREEP undergoes SLI. Norms of experimental and Apollo 15 basaltic immiscible glasses suggest that thevREEP-Fraction found in the lunar highlands has undergone post-SLI fractionation of at least fayalite. This significantly reduces the density of the REEP-Fraction and coupled with its low viscosity (10–15 poise), it can percolate upward, metasomatizing the lunar crust. The higher viscosity of the granitic melt (=∼30000 poise) inhibits its mobility, and it forms “pods” in the lower rust (as required for VHK basalt petrogenesis). With the identification of KREEPy components, the composition of urKREEP can be calculated. Using experimental evidence, the KREEP components may be recombined to give the pre-SLI composition, or liquid-liquid Kd's can be used to calculate a pre-SLI composition from lunar granite. Both calculated urKREEP compositions are lower in MgO and Al2O3 and higher in FeO and P2O5 than reported low- and high-K KREEP compositions. The calculated REE abundances are higher and the REE profiles are slightly more LREE-enriched than the previously reported KREEP compositions. However, the REE profile calculated using liquid-liquid Kd's is concave-upwards, compared to the LREE-enriched profile produced by recombining the KREEP components. Pre-SLI whitlockite/apatite fractionation occurred prior to immiscibility in order to generate the concave-upwards profile. The LREE-enriched profile represents the pre-SLI magma prior to phosphate fractionation. The presence of “superKREEPy” rock types can be accounted for by K- and REEP-Fraction assimilation, and the compositions of olivine vitrophyres can now be modeled using analyzed lunar rock types without the inference of a mythical “high-Mg” component. Other, more widespread KREEPy rocks (e.g., Apollo 14 breccias, Apollo 15 KREEP basalts, LKFM basalts) are produced by incorporation of the more widespread pre-SLI urKREEP component. The splitting of KREEP into identifiable lithological components allows the petrogenesis and role of KREEP in lunar evolution to be better understood." @default.
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- W2052562167 date "1989-02-01" @default.
- W2052562167 modified "2023-09-24" @default.
- W2052562167 title "Metasomatic products of the lunar magma ocean: The role of KREEP dissemination" @default.
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- W2052562167 doi "https://doi.org/10.1016/0016-7037(89)90403-1" @default.
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