| Title | New U-Pb zircon crystallization ages from the Aishihik Batholith, southern Yukon |
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| Author | Joyce, N L ;
Colpron, M; Allan, M; Sack, P J; Crowley, J L; Chapman, J B |
| Source | Yukon exploration and geology 2015; 2015 p. 131-149 |
| Year | 2015 |
| Alt Series | Earth Sciences Sector, Contribution Series 20150368 |
| Publisher | Yukon Geological Survey |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf (Adobe® Reader®); xlsx (Microsoft® Excel®); xls (Microsoft® Excel®) |
| Province | Yukon |
| NTS | 115 |
| Area | Aishihik batholith |
| Lat/Long WENS | -144.0000 -136.0000 63.0000 60.0000 |
| Subjects | economic geology; geochemistry; geochronology; igneous and metamorphic petrology; regional geology; batholiths; copper; gold; porphyry deposits; porphyry copper; orthogneisses; uranium lead dating;
orogenesis; mineral exploration; mass spectrometer analysis; Jurassic; Triassic |
| Illustrations | geologic maps; tables; photographs; graphs; photomicrographs |
| Program | GEM2: Geo-mapping for Energy and Minerals Western Cordillera, Regional porphyry transitions |
| Released | 2015 01 01 |
| Abstract | New U-Pb zircon dates (SHRIMP and LA-ICPMS) from granitoid rocks of the Aishihik batholith indicate a range of ca. 190-180 Ma for the Long Lake plutonic suite, as previously indicated by less precise,
multi-grain TIMS dates. None of the phases in the Aishihik batholith are as old as the Minto suite to the north, therefore limiting the potential for Minto-style Cu-Au-Ag mineralization in the batholith. However, local occurrences of apparently
shallow-level intrusions suggest that parts of the Aishihik batholith may present suitable targets for more typical porphyry Cu-Au mineralization. LA-ICPMS U-Pb zircon dating of two orthogneiss samples from the western margin of the Aishihik
batholith yielded Early Mississippian protolith ages akin to the Simpson Range plutonic suite (Yukon-Tanana terrane), and Jurassic overgrowths consistent with partial melting related to intrusion of the Aishihik batholith. |
| Summary | (Plain Language Summary, not published)
This report presents isotopic dating results for zircon from plutonic rocks in Yukon. It details the age, distribution and characteristics of plutonic
rocks in Yukon on the basis of field observations and laboratory analyses. It indicates that these plutonic rocks are significantly younger than the previously correlated rocks. The results presented herein help progress GEM2 model to ultimately
redefine the regional tectonic models of the Cordillera. |
| GEOSCAN ID | 297463 |
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