Crystallisation sequence of a REE-rich carbonate melt: an experimental approach
نویسندگان
چکیده
Carbonatites host Earth’s main REE deposits, with bastnaesite (LREE)CO 3 F being the economic REE-bearing mineral. However, mineralisation processes are debated between hydrothermal or magmatic origin. This study aims to assess if can be magmatic, and characterise behaviour during carbonatite crystallisation. Crystallisation experiments have been performed from 900 600 °C at 1 kbar, on a REE-rich calciocarbonatitic composition. calcite is dominant crystallising mineral, driving residual melt towards natrocarbonatitic compositions. Both halogens (i.e., Cl F) water decrease temperature of saturation. slightly incompatible calcite: for all REE, partition coefficients carbonate comprised 11, increase decrease. Britholite (REE, Ca) 5 ((Si,P)O 4 ) (F,OH) crystallises high temperatures (700–900 °C), while pyrochlore (Ca,Na,REE) 2 Nb O 6 (OH,F) low (600–700 as well apatite (600–650 °C). No found in crystallisation experiments. We thus saturation experiment °C. The bastnaesite-saturated contains 20 wt% REE: such unlikely happen nature. Textural evidences imply Na, Cl, fluid hydrous conditions. propose that fluids mineralising agent stage (<600
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ژورنال
عنوان ژورنال: Comptes Rendus Geoscience
سال: 2022
ISSN: ['1778-7025', '1631-0713']
DOI: https://doi.org/10.5802/crgeos.108