| Reference Type | Journal (article/letter/editorial) |
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| Title | Petrology of the Blue Mountain and Bigwood felsic alkaline complexes of the Grenville province of Ontario |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Duke, N. A. | Author |
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| Edgar, A. D. | Author |
| Year | 1977 (April 1) | Volume | 14 |
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| Issue | 4 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e77-055Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 475282 | Long-form Identifier | mindat:1:5:475282:4 |
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| GUID | 0 |
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| Full Reference | Duke, N. A., Edgar, A. D. (1977) Petrology of the Blue Mountain and Bigwood felsic alkaline complexes of the Grenville province of Ontario. Canadian Journal of Earth Sciences, 14 (4) 515-538 doi:10.1139/e77-055 |
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| Plain Text | Duke, N. A., Edgar, A. D. (1977) Petrology of the Blue Mountain and Bigwood felsic alkaline complexes of the Grenville province of Ontario. Canadian Journal of Earth Sciences, 14 (4) 515-538 doi:10.1139/e77-055 |
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| In | (1977, April) Canadian Journal of Earth Sciences Vol. 14 (4) Canadian Science Publishing |
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| Abstract/Notes | The Blue Mountain, Methuen Township, and Bigwood, District of Sudbury, alkaline gneiss complexes of the southwestern Grenville province occur in areas of medium to high grade regional metamorphism equivalent to temperatures between 550 °C to 700 °C and [Formula: see text] to 7 kb (350 to 700 Mega Pascals (MPa)) total pressure. Textures of the undersaturated alkaline gneisses of both complexes are predominantly characteristic of metamorphic–metasomatic processes. Compositions of the major (feldspar, nepheline) and minor (biotite, muscovite, amphibole, pyroxene, garnet) minerals in these rocks, when compared to known stability relations and minimum melting curves of the Blue Mountain nepheline-bearing gneiss, indicate equilibration at temperatures and pressures below the maximum values for the regional metamorphism.Textures and mineral compositions in the rocks of both complexes also suggest that extensive metasomatism has taken place. Consequently these rocks must now be regarded as metamorphic metasomatic rocks produced during one or more periods of regional metamorphism. Age relationships in both complexes are in agreement with this hypothesis. The ultimate origins of the rocks of both complexes are unknown but, in the case of the Blue Mountain complex, partial melting of alkali olivine basalts, or of an unknown and possibly mantle derived source in the Bigwood complex, may have produced liquids of nepheline syenite compositions from which the present rocks were derived by metamorphic and metasomatic processes. |
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