| Title | New U-Pb zircon ages of plutonic rocks from the Jeannin Lake area, Quebec: an evaluation of the Kuujjuaq Domain and Rachel-Laporte Zone |
| Download | Downloads |
| Author | Rayner, N M; Lafrance, I; Corrigan, D; Charette, B |
| Source | Geological Survey of Canada, Current Research (Online) 2017-4, 2017, 14 pages, https://doi.org/10.4095/306180 (Open Access) |
| Year | 2017 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | readme
|
| File format | pdf (Adobe® Reader®); rtf; csv; xlsx (Microsoft® Excel®) |
| Province | Quebec |
| NTS | 23O/14; 23O/15; 23O/16; 23P/13; 24A/04; 24B; 24C/09; 24C/16 |
| Area | Jeannin Lake; Wheeler River; Lhande Lake; Champdoré Lake |
| Lat/Long WENS | -68.5000 -65.5000 57.0000 55.7500 |
| Subjects | geochronology; stratigraphy; tectonics; structural geology; Archean; bedrock geology; lithology; igneous rocks; intrusive rocks; monzonites; granites; tonalites; pegmatites; diorites; structural
features; faults; shear zones; tectonic history; tectonic interpretations; rifting; crystallization; deformation; metamorphism; foliation; recrystallization; radiometric dates; uranium lead dating; zircon; correlations; New Quebec Orogen;
Rachel-Laporte Zone; Boullé Complex; Wheeler Complex; Kuujjuaq Domain; Lhande Plutonic Suite; Champdoré Plutonic Suite; Saffray Suite; Dancelou Suite; Turcotte Lake Fault; Superior Craton; Core Zone; Trans-Hudson Orogeny; Sensitive High Resolution
Ion Microprobe (SHRIMP) analysis; Precambrian; Proterozoic |
| Illustrations | geoscientific sketch maps; tables; photographs; photomicrographs; Concordia diagrams |
| Program | Hudson/Ungava Core Zone, GEM2: Geo-mapping for Energy and Minerals |
| Released | 2017 12 12 |
| Abstract | Three strongly foliated or recrystallized samples were identified in the field as potential Archean basement and were collected for geochronology in order to compare their crystallization ages with the
ages of known basement in the Superior Craton and Core Zone. A porphyritic monzonite from the thrust-bound Boullé Complex within the Rachel-Laporte Zone yields a crystallization age of 2690 ± 4 Ma. A 2696 ± 4 Ma magnetite granite of the Saffray Suite
is similar in age and composition to large potassic suites of the Superior Craton. These ages stand in contrast to a younger 2668 ± 5 Ma crystallization age for a tonalite of the Wheeler Complex from a separate structural dome within the
Rachel-Laporte Zone.
The ages of the Champdoré and Lhande plutonic suites are 1839 ± 6 Ma and 1835 ± 4 Ma, respectively. As these units are metamorphosed and strongly foliated, they also provide a maximum age constraint on peak Paleoproterozoic
tectonothermal overprint. The post-tectonic pegmatite of the Dancelou Suite provides a 1793 ± 4 Ma constraint on the cessation of deformation in that area. |
| Summary | (Plain Language Summary, not published)
Knowledge of the age of rocks (geochronology) is critical in the making of a geologic map as it allows scientists to add the measurement of time to their
field observations and permits comparisons with rocks elsewhere of similar age and appearance. This report presents ages from 6 samples in the lac Jeannin area of Quebec, approximately halfway between Schefferville and Kuujjuaq. The results presented
in this report help test conflicting correlations and refine tectonic models. New data will provide a more robust tectonostratigraphic and magmatic context in which to undertake mineral exploration. |
| GEOSCAN ID | 306180 |
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