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- W2096780527 abstract "Abstract Nearly boron-free kornerupine is locally abundant in pods or lenses of coarse-grained, non-foliated, Mg- and Al-rich rocks that occur at high metamorphic grades in early Proterozoic metapelitic rocks from the Reynolds Range, Northern Territory, Australia. This is the third reported occurrence of boron-free kornerupine worldwide. The samples consist almost entirely of coarse-grained kornerupine and its breakdown products sapphirine, cordierite, and gedrite or orthopyroxene. The kornerupine contains only 0.45 wt.% B 2 O 3 , corresponding to 0.098 B atoms per 22 (O, OH), and closely approximates 11:10:11 in terms of molar ratios of (MgO + FeO total ):Al 2 O 3 :SiO 2 , with X Mg = Mg/(Mg + Fe total ) = 0.874. The unusual textures and bulk compositions of the rocks in the pods are interpreted to have resulted from metasomatism and high-grade metamorphism (750 to 800° and ∼ 4.5 kbar) of precursors that may have included sedimentary Mg-rich clays. Rocks containing boron-poor, and relatively boronrich kornerupine (2.18 wt.% B 2 O 3 ; X Mg = 0.892) are separated in outcrop by as little as 10 m of the foliated cordierite-quartzite country rock and other rock types, suggesting that the compositions or amounts of the metasomatic fluids varied on a local scale." @default.
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- W2096780527 date "1994-03-01" @default.
- W2096780527 modified "2023-09-24" @default.
- W2096780527 title "Boron-free kornerupine from the Reynolds Range, Arunta Block, central Australia" @default.
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- W2096780527 doi "https://doi.org/10.1180/minmag.1994.058.390.03" @default.
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