Ashworth, J. R., Reverdatto, V. V., kolobov, V. YU., Lepetyukha, V. V., Sheplev, V. S., Bryxina, N. A. (1998) Textures of diffusion-controlled reaction in contact-metamorphosed Mg-rich granulite, Kokchetav area, Kazakhstan. Mineralogical Magazine, 62 (2) 213-224 doi:10.1180/002646198547585
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Textures of diffusion-controlled reaction in contact-metamorphosed Mg-rich granulite, Kokchetav area, Kazakhstan | ||
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
| Authors | Ashworth, J. R. | Author | |
| Reverdatto, V. V. | Author | ||
| kolobov, V. YU. | Author | ||
| Lepetyukha, V. V. | Author | ||
| Sheplev, V. S. | Author | ||
| Bryxina, N. A. | Author | ||
| Year | 1998 (April) | Volume | 62 |
| Issue | 2 | ||
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-2-213.pdf+ | ||
| DOI | doi:10.1180/002646198547585Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 263 | Long-form Identifier | mindat:1:5:263:1 |
| GUID | 0 | ||
| Full Reference | Ashworth, J. R., Reverdatto, V. V., kolobov, V. YU., Lepetyukha, V. V., Sheplev, V. S., Bryxina, N. A. (1998) Textures of diffusion-controlled reaction in contact-metamorphosed Mg-rich granulite, Kokchetav area, Kazakhstan. Mineralogical Magazine, 62 (2) 213-224 doi:10.1180/002646198547585 | ||
| Plain Text | Ashworth, J. R., Reverdatto, V. V., kolobov, V. YU., Lepetyukha, V. V., Sheplev, V. S., Bryxina, N. A. (1998) Textures of diffusion-controlled reaction in contact-metamorphosed Mg-rich granulite, Kokchetav area, Kazakhstan. Mineralogical Magazine, 62 (2) 213-224 doi:10.1180/002646198547585 | ||
| In | (1998, April) Mineralogical Magazine Vol. 62 (2) Mineralogical Society | ||
| Abstract/Notes | AbstrsctIn a granulite from the Kokchetav massif, a complex mineral assemblage and intricate textures have resulted from a combination of unusual rock composition and twoâstage metamorphic history. The second, contact metamorphism produced mainly cordierite and anthophyllite, reflecting a bulk composition attributed to preâmetamorphic alteration of basic igneous rock. From the first, highpressure metamorphism, garnet relics persist while another mineral has been completely pseudomorphed. The garnet is partly replaced by a symplectite of three minerals: orthopyroxene vermicules in a coarser intergrowth of cordierite and calcic plagioclase. Despite variable proportions of cordierite and plagioclase, the Al:Si ratio of the symplectite is almost constant, because the proportion of orthopyroxene is smaller where the dominant aluminous mineral is cordierite (Al:Si â 0.8) than where the even more aluminous plagioclase (Al:Si â 0.89) is prominent. The bulk Al:Si ratio of this symplectite, approximately 0.69, is very close to that of reactant garnet (0.66), indicating that Al and Si have been retained almost completely during the local reaction, while other elements were more mobile. In the pseudomorphs, aluminous cores (with Al:Si ratios 1.61â1.93) indicate that the mineral which has been completely replaced was probably kyanite. These cores comprise plagioclase, zoisite, corundum and spinel, and are surrounded by layers of plagioclase and cordierite. Fe, Mg, and Ca have diffused to the core, through layers with low bulk concentrations of these elements, probably by grainboundary diffusion in the solid state. | ||
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