| Reference Type | Journal (article/letter/editorial) |
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| Title | Trondhjemitic basement enclave near the Archean Favourable Lake volcanic complex, northwestern Ontario, Canada |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Hillary, E. M. | Author |
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| Ayres, L. D. | Author |
| Year | 1980 (May 1) | Volume | 17 |
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| Issue | 5 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e80-061Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 476687 | Long-form Identifier | mindat:1:5:476687:6 |
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| GUID | 0 |
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| Full Reference | Hillary, E. M., Ayres, L. D. (1980) Trondhjemitic basement enclave near the Archean Favourable Lake volcanic complex, northwestern Ontario, Canada. Canadian Journal of Earth Sciences, 17 (5) 652-667 doi:10.1139/e80-061 |
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| Plain Text | Hillary, E. M., Ayres, L. D. (1980) Trondhjemitic basement enclave near the Archean Favourable Lake volcanic complex, northwestern Ontario, Canada. Canadian Journal of Earth Sciences, 17 (5) 652-667 doi:10.1139/e80-061 |
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| In | (1980, May) Canadian Journal of Earth Sciences Vol. 17 (5) Canadian Science Publishing |
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| Abstract/Notes | A 15 km2 foliated to gneissic trondhjemite enclave (2.91 Ga) in the Archean North Trout Lake batholith is a metamorphosed remnant of prevolcanism sialic basement. The basement is separated from the nearby Archean Favourable Lake volcanic complex by younger plutons, but was a source of detritus for some of the sedimentary formations in the volcanic complex. The trondhjemite is only a small remnant of an originally more extensive basement.Primary plutonic features can be readily recognized in the trondhjemite in spite of amphibolite facies metamorphism. The basement underwent at least two deformational events: (1) syn-emplacement deformation that produced foliation and gneissosity, and brecciated and deformed early dikes and xenoliths and (2) later recrystallization. The recrystallization was caused by strain and heat produced by emplacement of the North Trout Lake batholith. Emplacement of successive batholith phases progressively heated the basement and elevated it from its originally deeper level. Metamorphism culminated with emplacement of the youngest major phase of the batholith. The intensity of recrystallization and the habit and abundance of late leucocratic quartz monzonite sills and dikes are zoned with respect to this youngest phase.The high Al2O3 trondhjemitic magma probably formed by partial melting of amphibolite at relatively shallow depths. The parent amphibolite probably represents a still earlier volcanic event. |
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