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- W2072212948 abstract "Three successive stages of crystallization (magmatic, late-magmatic and hydrothermal) were petrographically, mineralogically and chemically distinguished in the Juquiá carbonatite (southern Brazil). The first stage corresponds to crystallization of magmatic Fe-dolomite and hydroxy-fluorapatite, with phlogopite micas and magnetite as accessories. The second stage is characterized by the formation of late-magmatic Na-rich carbonate-fluorapatite, followed by the crystallization of Sr-rich fluorapatite. Veins of barite represent the hydrothermal third stage of crystallization. Post-magmatic mineralizations induced re-equilibration processes which also influenced the geochemical characteristics of the carbonatite. The greatest changes are observed for trace elements (Na, Sr, Ba), REE, and 87Sr86Sr ratios. Isotopic ratios δ18O, δ13C and 143Nd44Nd values clearly support the magmatic origin of the two first mineralization stages. Evolution of 143Nd144Nd and 87Sr86Sr isotopic ratios during the post-magmatic processes indicates the possible participation of either some exogenic fluid, or batches of magma, with distinct compositions or more evolved fluids during crystallization of late-magmatic minerals. REE distributions show a progressive MREE to HREE enrichment, compared to LREE, along the three stages of mineralization. This evolution is explained as the result of preferential complexation of HREE in the last fluids in the form of carbonate, fluoride, phosphate or multiple complexes." @default.
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- W2072212948 date "1995-02-01" @default.
- W2072212948 modified "2023-09-30" @default.
- W2072212948 title "Rare-earth elements and isotopes (Sr, Nd, O, C) in minerals from the Juquiá carbonatite (Brazil): tracers of a multistage evolution" @default.
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- W2072212948 doi "https://doi.org/10.1016/0009-2541(94)00101-d" @default.
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