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- W2486011760 abstract "The Kotalahti and Vammala belts in central and southern Finland, respectively, contain most of the 1.88 Ga intrusive Svecofennian nickel deposits. The Kotalahti belt is located close to the Archean craton margin, while the Vammala belt occurs further to the southwest within the Svecofennian domain. The total ore production from the 10 Svecofennian nickel mines in Finland has been about 45 Mt at 0.7% Ni and the total premining resource of all deposits known to date is about 73 Mt at 0.6% Ni. The belts are characterized by amphibolite facies to granulite facies metamorphic grade and abundant schollen- and schlieren-migmatites. The intrusions were emplaced during peak deformation and metamorphism. This resulted in highly variable settings of the intrusions and, in many cases, their dismemberment. The weakly differentiated, dominantly ultramafic Vammala-type intrusions consist almost entirely of olivine cumulates and represent magma conduits. The more strongly differentiated, mafic and mafic–ultramafic, Kotalahti-type intrusions consist of olivine cumulates, pyroxene cumulates, and plagioclase-bearing cumulates. In both belts, the parental magma was basaltic with MgO contents mostly around 10–12 wt%. Sulfide segregation took place via crustal contamination when sulfur was added to the magma from the wall rocks. The mass ratio of silicate melt/sulfide melt (R factor) varied mostly between 200 and 1300 and, consequently, a wide range in nickel tenor is observed." @default.
- W2486011760 created "2016-08-23" @default.
- W2486011760 creator A5018454063 @default.
- W2486011760 date "2015-01-01" @default.
- W2486011760 modified "2023-09-29" @default.
- W2486011760 title "Nickel Deposits of the 1.88 Ga Kotalahti and Vammala Belts" @default.
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- W2486011760 doi "https://doi.org/10.1016/b978-0-12-410438-9.00010-8" @default.
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