| Reference Type | Journal (article/letter/editorial) |
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| Title | Boron-free kornerupine from the Reynolds Range, Arunta Block, central Australia |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Vry, J. K. | Author |
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| Year | 1994 (March) | Volume | 58 |
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| Issue | 390 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_58/58-390-27.pdf+ |
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| DOI | doi:10.1180/minmag.1994.058.390.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2000 | Long-form Identifier | mindat:1:5:2000:2 |
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| GUID | 0 |
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| Full Reference | Vry, J. K. (1994) Boron-free kornerupine from the Reynolds Range, Arunta Block, central Australia. Mineralogical Magazine, 58 (390) 27-37 doi:10.1180/minmag.1994.058.390.03 |
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| Plain Text | Vry, J. K. (1994) Boron-free kornerupine from the Reynolds Range, Arunta Block, central Australia. Mineralogical Magazine, 58 (390) 27-37 doi:10.1180/minmag.1994.058.390.03 |
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| In | (1994, March) Mineralogical Magazine Vol. 58 (390) Mineralogical Society |
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| Abstract/Notes | AbstractNearly 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.% B2O3, corresponding to 0.098 B atoms per 22 (O, OH), and closely approximates 11:10:11 in terms of molar ratios of (MgO + FeOtotal):Al2O3:SiO2, with XMg = Mg/(Mg + Fetotal) = 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.% B2O3; XMg = 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. |
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