| Reference Type | Journal (article/letter/editorial) |
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| Title | Stable coexistence of grandidierite and kornerupine during medium pressure granulite facies metamorphism |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Carson, C. J. | Author |
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| Hand, M. | Author |
| Dirks, P. H. G. M. | Author |
| Year | 1995 (June) | Volume | 59 |
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| Issue | 395 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_59/59-395-327.pdf+ |
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| DOI | doi:10.1180/minmag.1995.059.395.16Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2648 | Long-form Identifier | mindat:1:5:2648:6 |
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| GUID | 0 |
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| Full Reference | Carson, C. J., Hand, M., Dirks, P. H. G. M. (1995) Stable coexistence of grandidierite and kornerupine during medium pressure granulite facies metamorphism. Mineralogical Magazine, 59 (395) 327-339 doi:10.1180/minmag.1995.059.395.16 |
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| Plain Text | Carson, C. J., Hand, M., Dirks, P. H. G. M. (1995) Stable coexistence of grandidierite and kornerupine during medium pressure granulite facies metamorphism. Mineralogical Magazine, 59 (395) 327-339 doi:10.1180/minmag.1995.059.395.16 |
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| In | (1995, June) Mineralogical Magazine Vol. 59 (395) Mineralogical Society |
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| Abstract/Notes | AbstractPetrological and mineral chemical data are presented for two new occurrences of co-existing borosilicate minerals in the Larsemann Hills, East Antarctica. The assemblages contain kornerupine and the rare borosilicate, grandidierite (Mg,Fe)A13BSiO9. Two distinct associations occur: (1) At McCarthy Point, 1β10 mm thick tourmaline-kornerupine-grandidierite layers are hosted within quartzofeldspathic gneiss; and (2) Seal Cove, where coexisting kornerupine and grandidierite occur within coarse-grained, metamorphic segregations with Mg-rich cores of cordierite-garnet-spinel-biotite-ilmenite and variably developed plagioclase halos. The segregations are hosted within biotite-bearing, plagio-feldspathic gneiss. Textural relationships from these localities indicate the stability of co-existing kornerupine and grandidierite.The grandidierite- and kornerupine-bearing segregations from Seal Cove largely postdate structures developed during a crustal thickening event (D2) which was coeval with peak metamorphism. At McCarthy Point, grandidierite, kornerupine and late-tourmaline growth predates, or is synchronous, with F3 fold structures developed during a extensive granulite grade, normal shearing event (D3) which occurred prior to, and synchronous with, near-isothermal decompression. Average pressure calculations on assemblages that coexist with the borosilicates at Seal Cove, indicate the prevailing conditions were 5.2β5.5 kbar at βΌ 750Β°C for formation of the grandidierite-kornerupine assemblage. |
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