Ashworth, J. R., Birdi, J. J., Emmett, T. F. (1992) A complex corona between olivine and plagioclase from the Jotun Nappe, Norway, and the diffusion modelling of multimineralic layers. Mineralogical Magazine, 56 (385) 511-525 doi:10.1180/minmag.1992.056.385.07
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | A complex corona between olivine and plagioclase from the Jotun Nappe, Norway, and the diffusion modelling of multimineralic layers | ||
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
| Authors | Ashworth, J. R. | Author | |
| Birdi, J. J. | Author | ||
| Emmett, T. F. | Author | ||
| Year | 1992 (December) | Volume | 56 |
| Issue | 385 | ||
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_56/56-385-511.pdf+ | ||
| DOI | doi:10.1180/minmag.1992.056.385.07Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 1865 | Long-form Identifier | mindat:1:5:1865:8 |
| GUID | 0 | ||
| Full Reference | Ashworth, J. R., Birdi, J. J., Emmett, T. F. (1992) A complex corona between olivine and plagioclase from the Jotun Nappe, Norway, and the diffusion modelling of multimineralic layers. Mineralogical Magazine, 56 (385) 511-525 doi:10.1180/minmag.1992.056.385.07 | ||
| Plain Text | Ashworth, J. R., Birdi, J. J., Emmett, T. F. (1992) A complex corona between olivine and plagioclase from the Jotun Nappe, Norway, and the diffusion modelling of multimineralic layers. Mineralogical Magazine, 56 (385) 511-525 doi:10.1180/minmag.1992.056.385.07 | ||
| In | (1992, December) Mineralogical Magazine Vol. 56 (385) Mineralogical Society | ||
| Abstract/Notes | AbstractCoronas containing Ca-amphibole with aluminous minerals have been characterised optically and by scanning electron microscopy, analytical transmission electron microscopy and electron-probe microanalysis. The layers nearest to plagioclase are amphibole + epidote + kyanite, followed by amphibole + epidote + staurolite + spinel. These assemblages are consistent with waterundersaturated conditions, possibly at lower metamorphic grade than the commoner assemblage amphibole + spinel. Observed mineral proportions and compositions were used in a seven-layer model of steady-state, diffusion-controlled growth with local equilibrium. This model is not fully realistic, because the observed amphibole is strongly zoned from tschermakitic to actinolitic away from plagioclase, suggesting disequilibrium. However, the four-mineral layer has been successfully modelled assuming local equilibrium, with diffusion coefficients Lii larger for i = FeO and MgO than for SiO2, AlO3/2, CaO and FeO3/2. Retarded grain-boundary diffusion of the latter components is explicable by crystal-chemical effects. The number of minerals per layer is constrained by a modified form of the metasomatic phase rule of Korzhinskii, with the role of 'inert' components played by relatively immobile ones (having relatively small fluxes and relatively small diffusion coefficients). | ||
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