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- W2270256319 abstract "The Clay Howells Alkalic Complex is located 40 km northnortheast of Kapuskasing in central Ontario. It is a 110 km2 layered syenite – nepheline syenite – carbonatite ring dyke complex, with a parabolic ring structure for the carbonatite deposit, as defined by an airborne magnetic and radiometric geophysical survey completed by Rare Earth Metals Inc. in January 2010. Monazites have been dated using Laser Ablation – ICPMS (Pb/Pb and U/Pb ratios), returning an age of 1056.1 ± 3.9 Ma making it the youngest in that group of middle Proterozoic carbonatites. The Clay Howells REE-Nb deposit is magnetite rich and has been recently estimated at 8.5 million tonnes averaging 0.73% TREO and 0.14% Nb2O5 with 44.5% Fe2O3T, with 10% of the TREO being HREO. Two arcuate carbonatitic lenses within the alkali complex have been identified with an average width of 67 m. In these magnetite cumulates, higher grades of Nb-REO have been measured, represented by 2.7% TREO (with 10% as HREO) over 4.9 m. The (auto-) oxidation of ferrocarbonatite (ankerite) magma to crystallize magnetite during emplacement with migration to shallow depth seems to involve volatile exsolution (H2O, CO2, H2). This process may also be used to explain the crystallization of these large magnesian calcite and dolomite bodies that were an extremely fractionated Fe-Mg-rich carbonatite magma with high RE and Nb oxides at low temperature and pressure, with increasing O2 fugacity. Carbonatite magmas have extremely low viscosities and liquidus temperatures that enable emplacement to shallow levels and possibly even erupt. H2O exsolution from the crystallizing ferroan carbonatite magma, possibly released H2 (gas) by the reaction:" @default.
- W2270256319 created "2016-06-24" @default.
- W2270256319 creator A5005684483 @default.
- W2270256319 date "2011-01-01" @default.
- W2270256319 modified "2023-09-23" @default.
- W2270256319 title "Abstract: Rare-earth element-niobium mineralized carbonatite, Clay Howells Alkalic Complex, Kapuskasing, Ontario: significance of magnetite saturation and fractionation" @default.
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