| Reference Type | Journal (article/letter/editorial) |
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| Title | Garnet zoning and the identification of equilibrium mineral compositions in high‐pressure–temperature granulites from the Moldanubian Zone, Austria |
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| Journal | Journal of Metamorphic Geology |
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| Authors | Cooke, | Author |
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| O'Brien, | Author |
| Carswell, | Author |
| Cooke, R.A. | Author |
| O’Brien, P.J. | Author |
| Carswell, D.A. | Author |
| Year | 2000 (September) | Volume | 18 |
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| Page(s) | 551-569 | Issue | 5 |
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| Publisher | Wiley |
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| URL | |
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| DOI | doi:10.1046/j.1525-1314.2000.00273.xSearch in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 160534 | Long-form Identifier | mindat:1:5:160534:5 |
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| GUID | 0 |
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| Full Reference | Cooke, R.A., O’Brien, P.J., Carswell, D.A. (2000) Garnet zoning and the identification of equilibrium mineral compositions in high‐pressure–temperature granulites from the Moldanubian Zone, Austria. Journal of Metamorphic Geology, 18 (5). 551-569 doi:10.1046/j.1525-1314.2000.00273.x |
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| Plain Text | Cooke, R.A., O’Brien, P.J., Carswell, D.A. (2000) Garnet zoning and the identification of equilibrium mineral compositions in high‐pressure–temperature granulites from the Moldanubian Zone, Austria. Journal of Metamorphic Geology, 18 (5). 551-569 doi:10.1046/j.1525-1314.2000.00273.x |
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| In | (2000, September) Journal of Metamorphic Geology Vol. 18 (5) Wiley |
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| Abstract/Notes | A detailed investigation of the compositional variation in garnet has been undertaken in a garnet–pyroxene‐bearing granulite from the high‐grade Gföhl Unit, Moldanubian Zone, Lower Austria. Textural observations, together with the interpretation of the preserved garnet chemistry, enables the recognition of both prograde core and peak metamorphic garnet mantle growth stages, an extremely rare feature in high‐P–T granulite facies rocks. Initial thermobarometric calculations undertaken across whole garnet zoning profiles show how correct interpretation of a zoning profile is essential if the maximum peak metamorphic P–T conditions are to be recovered. The effect of retrograde decompression‐ and cooling‐driven reactions on inclusion and host garnet compositions has also been assessed. The results indicate that caution should be exercised when utilizing inclusion and adjacent garnet compositions for the thermobarometric evaluation of peak metamorphic equilibration conditions. Peak P–T conditions were determined by the TWEEQU thermobarometric method, utilizing the core compositions of matrix phases combined with the interpreted high‐P–T garnet mantle composition, to give 15.6 kbar and 1090 °C, consistent with previously determined results for Moldanubian granulites. Similar high‐P–T estimates are also provided by a re‐evaluation of previously published results for a granulite sample from the same lithological unit, using a modified interpretation of garnet and plagioclase compositional data. The new estimates presented confirm the previously disputed idea that the Gföhl Unit underwent a high‐pressure granulite facies stage and is therefore distinctly different from the underlying tectonostratigraphic units. It is emphasized that any interpretation of the peak metamorphic conditions in high‐grade rocks must be based on detailed petrographic observations combined with a thorough understanding of the co‐existing equilibrium mineral compositions. |
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