| Reference Type | Journal (article/letter/editorial) |
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| Title | A natural example of the disequilibrium breakdown of biotite at high temperature: TEM observations and comparison with experimental kinetic data |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Brearley, A. J. | Author |
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| Year | 1987 (March) | Volume | 51 |
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| Issue | 359 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_51/51-359-93.pdf+ |
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| DOI | doi:10.1180/minmag.1987.051.359.09Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1350 | Long-form Identifier | mindat:1:5:1350:9 |
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| GUID | 0 |
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| Full Reference | Brearley, A. J. (1987) A natural example of the disequilibrium breakdown of biotite at high temperature: TEM observations and comparison with experimental kinetic data. Mineralogical Magazine, 51 (359) 93-106 doi:10.1180/minmag.1987.051.359.09 |
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| Plain Text | Brearley, A. J. (1987) A natural example of the disequilibrium breakdown of biotite at high temperature: TEM observations and comparison with experimental kinetic data. Mineralogical Magazine, 51 (359) 93-106 doi:10.1180/minmag.1987.051.359.09 |
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| In | (1987, March) Mineralogical Magazine Vol. 51 (359) Mineralogical Society |
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| Abstract/Notes | AbstractTransmission electron microscopy has been used to investigate the mechanism of natural biotite breakdown under pyrometamorphic disequilibrium conditions. Biotite in a xenolith of pelitic gneiss collected from a Tertiary dolerite sill, Isle of Mull, Scotland, shows evidence of an incipient reaction, characterised by a darkening in colour and the appearance of areas of fine-grained reaction products. TEM and analytical electron microscope data show that the reaction can be described as:The orientations of the product phase are controlled by the crystallography of the reacting biotite, demonstrating that the transformation proceeds by a topotactic mechanism. An empirical method, based on the Mg/(Fe2+ + Fe3+) ratios of coexisting spinel and biotite from experimental data, is used to deduce that the reaction occurred above ∼ 770 °C. A comparison of the natural reaction microstructures with those produced experimentally suggest that the xenolith was probably above 800 °C for less than 48 hours and cooled to temperatures of 770 °C after ∼ 150–200 hours. |
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