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• W2141947654 startingPage "785" @default.
• W2141947654 abstract "Gamet-bearing high-temperature peridotite massifs in lower Austria were exhumed during Carboniferous plate convergence in the Bohemian massif. The peridotite massifs contain garnet pyroxenite layers, most of which are high-pressure cumulates that crystallized in the deep lithosphere during ascent and cooling of hot asthenospheric melts. Many of the pyroxenites have negative Eu anomalies and high LREE abundances in pyroxenes and bulk rocks, 87Sr/86Sr (335 Ma) as high as 0.7089, and εNd (335 Ma) as low as −4.8 (leached clinopyroxenes and garnets). These pyroxenites also show strong depletions in Rb, K, Ta, P and Ti compared with the REE Equilibrium melt compositions calculated from the cumulate compositions have very high LREE abundances (Lan = 300–600) and show strong LREEfractionation [(La/Sm)n = 7–47)]. Trace element abundances, the Ca–Al-rich composition of the cumulates and possible Ti saturation in the melts suggest that these melts were of primitive carbonatitic–melilitic or lamprophyrt-like composition. Other garnet pyroxenites such as Al-rich garnet-kyanite clinopyroxemtes with positive Eu anomalies probably represent metamorphosed crustal rocks which were subducted and accreted to the lithospheric mantle. The high 87Sr/86Sr, low εNd (335 Ma) and negative Eu anomalies of the high-pressure cumulates can be explained if their equilibrium melts contained a component derived from subducted upper-crustal rocks. The high equilibration pressures of the host peridotites (3–3.5 GPa) and the high equilibration temperatures of the pyroxenites (1100–1400°C) indicate that these melts are likely to be derived from the sub-lithospheric mantle. There, melting may have been triggered by small amounts of melt or fluids derived from a subducting slab at greater depth." @default.
• W2141947654 created "2016-06-24" @default.
• W2141947654 creator A5012433806 @default.
• W2141947654 date "1996-01-01" @default.
• W2141947654 modified "2023-10-12" @default.
• W2141947654 title "Crustal Trace Element and Isotopic Signatures in Garnet Pyroxenites from Garnet Peridotite Massifs from Lower Austria" @default.
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• W2141947654 doi "https://doi.org/10.1093/petrology/37.4.785" @default.
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