| Reference Type | Journal (article/letter/editorial) |
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| Title | Geochemical evolution of the Chatham–Grenville stock, Quebec |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Higgins, Michael Denis | Author |
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| Year | 1985 (June 1) | Volume | 22 |
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| Issue | 6 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e85-091Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 478702 | Long-form Identifier | mindat:1:5:478702:4 |
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| GUID | 0 |
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| Full Reference | Higgins, Michael Denis (1985) Geochemical evolution of the Chatham–Grenville stock, Quebec. Canadian Journal of Earth Sciences, 22 (6) 872-880 doi:10.1139/e85-091 |
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| Plain Text | Higgins, Michael Denis (1985) Geochemical evolution of the Chatham–Grenville stock, Quebec. Canadian Journal of Earth Sciences, 22 (6) 872-880 doi:10.1139/e85-091 |
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| In | (1985, June) Canadian Journal of Earth Sciences Vol. 22 (6) Canadian Science Publishing |
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| Abstract/Notes | The Chatham–Grenville stock is an anorogenic multiple intrusion that shows a complete gradation from early cumulate and noncumulate syenites to slightly peralkaline granites. It can be divided into four units. Unit 1, the first unit, is a noncumulate syenite with modal quartz less than 5%. Unit 2 has a wide range in composition from cumulate syenites (no modal quartz) to noncumulate syenites and quartz syenites (modal quartz = 20%). Units 3 and 4 are granites with modal quartz up to 25 and 30%, respectively. The parental magma of the whole complex was syenitic. Differentiation occurred as a result of crystal fractionation by filter pressing both at depth and in situ. Ba, Sr, Rb, and Eu abundances and major-element mass-balance calculations show that alkali feldspar, mafic minerals, and apatite were fractionated. At least 79% fractionation is necessary to transform the mean composition of the first unit (1) into the mean composition of the last unit (4). The rare-earth elements, Th, Ta, Hf, and Zr, did not behave in a residual fashion but may have been fractionated in minor accessory phases such as apatite, zircon, monazite, allanite, and xenotime. |
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