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• W1989373038 abstract "Abstract The formation of a Cpx-corona is discussed from the viewpoint of continuous reaction techniques. Two cases are distinguished: a closed and open system. The first case is based on the equation e Ol w + a Pl u = b Pl v + Opx x + c Cpx y + d Spl y Plagioclase is assumed to be a solid solution between anorthite and albite (Na u Ca 1−w Al 2−u Si 2+u O 8 ). The other minerals are solutions of their Fe- and Mg-end-members [e.g. (Mg w Fe 1−w ) 2 SiO 4 for olivine]. Spinel forms a ternary system of hercynite-spinel-magnetite. Stoichiometric coefficients are expressed in terms of the exchange parameters t , u , v , w , x , y and z . According to stoichiometries, the net molar quantity of phaligioclase consumed equals the number of moles of clinopyroxene and spinel produced. For each mole of olivine consumed there is one mole of opx produced. A closed system is suggested by the ability to predict one of the mineral compositions in terms of the others using one of the six mass balances (Na, Ca, Mg, Fe, Al, Si) left from the calculation of five stoichiometric coefficients. This model allows the calculation of mass transfer between different shells and explains coronas from the Adirondacks, Scandinavia and the Niquelândia layered complex (Brazil). In the second case the system is open and is described by the equation. Opx x + a Pl u + k Ca 2+ + h Si 4+ + f Fe 2+ = c Cpx y + l Na + + l Al 3 + g Mg 2+ The compositional variation of orthopyroxene and clinopyroxene allows the determination of c (Cpx), −(Fe 2+ ) and g (Mg 2+ ) which are interdependent. With a known value of c and assuming a constant volume of reaction the value of a may be determined. The final equation, for a plagioclase composition of X An = 0.75, is 1 Opx + 0.35 Pl + 0.74 Ca 2+ + 0.21 Si 4+ + 0.10 Mg 2+ = 1 Cpx + 0.61 Al 3+ + 0.10 Fe 2+ + 0.09 Na + This is the reaction responsible for the formation of Cpx-coronas in the Bushveld complex." @default.
• W1989373038 created "2016-06-24" @default.
• W1989373038 creator A5036343032 @default.
• W1989373038 date "1992-06-01" @default.
• W1989373038 modified "2023-10-01" @default.
• W1989373038 title "The formation of a clinopyroxene corona — Mass balance considerations" @default.
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• W1989373038 doi "https://doi.org/10.1016/0024-4937(92)90023-r" @default.
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