Machado, N., Krogh, T. E., Weber, W. (1990) U–Pb geochronology of basement gneisses in the Thompson Belt (Manitoba): evidence for pre-Kenoran and Pikwitonei-type crust and Early Proterozoic basement reactivation in the western margin of the Archean Superior Province. Canadian Journal of Earth Sciences, 27 (6) 794-802 doi:10.1139/e90-081
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | U–Pb geochronology of basement gneisses in the Thompson Belt (Manitoba): evidence for pre-Kenoran and Pikwitonei-type crust and Early Proterozoic basement reactivation in the western margin of the Archean Superior Province | ||
| Journal | Canadian Journal of Earth Sciences | ||
| Authors | Machado, N. | Author | |
| Krogh, T. E. | Author | ||
| Weber, W. | Author | ||
| Year | 1990 (June 1) | Volume | 27 |
| Issue | 6 | ||
| Publisher | Canadian Science Publishing | ||
| DOI | doi:10.1139/e90-081Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 480930 | Long-form Identifier | mindat:1:5:480930:6 |
| GUID | 0 | ||
| Full Reference | Machado, N., Krogh, T. E., Weber, W. (1990) U–Pb geochronology of basement gneisses in the Thompson Belt (Manitoba): evidence for pre-Kenoran and Pikwitonei-type crust and Early Proterozoic basement reactivation in the western margin of the Archean Superior Province. Canadian Journal of Earth Sciences, 27 (6) 794-802 doi:10.1139/e90-081 | ||
| Plain Text | Machado, N., Krogh, T. E., Weber, W. (1990) U–Pb geochronology of basement gneisses in the Thompson Belt (Manitoba): evidence for pre-Kenoran and Pikwitonei-type crust and Early Proterozoic basement reactivation in the western margin of the Archean Superior Province. Canadian Journal of Earth Sciences, 27 (6) 794-802 doi:10.1139/e90-081 | ||
| In | (1990, June) Canadian Journal of Earth Sciences Vol. 27 (6) Canadian Science Publishing | ||
| Abstract/Notes | A U–Pb study of basement gneisses in the Thompson Belt yields the following results: a gneiss from the Thompson pit contains zircon, monazite, and titanite dated at 2772 ± 7, 1770 ± 2, and 1720 ± 5 Ma, respectively. An amphibolite boudin in the gneiss contains zircon dated at 2725 ± 9 and 1770–1760 Ma. A banded gneiss from the Manasan River area contains zircon with minimum ages of 3029–3078 and 2905–3112 Ma and monazite 1786 ± 2 Ma old. The paleosome of a lit-par-lit migmatite in the Sasagiu Rapids area contains zircon defining a discordia with intercepts at 3038 ± 6 and 1809 ± 14 Ma, whilst two types of titanite yield apparent ages of 1768 ± 5 and 1737 ± 5 Ma. Zircons from the granitic neosome define a discordia between 2655 ± 10 and 1726 ± 12 Ma.These data indicate that the Thompson Belt is underlain by two types of Archean crust: a "Pikwitonei-type" represented by 2.65–2.8 Ga old gneisses and a pre-Kenoran type older than 3000 Ma, possibly as old as 3.2–3.4 Ga. Basement reactivation lasted for 80–100 Ma and took place during the collision between the Trans-Hudson Orogen and the Superior Province. | ||
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