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TitleNew U-Pb zircon crystallization ages from the Aishihik Batholith, southern Yukon
AuthorJoyce, N L; Colpron, M; Allan, M; Sack, P J; Crowley, J L; Chapman, J B
SourceYukon exploration and geology 2015; 2015 p. 131-149
Year2015
Alt SeriesEarth Sciences Sector, Contribution Series 20150368
PublisherYukon Geological Survey
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceYukon
NTS115
AreaAishihik batholith
Lat/Long WENS-144.0000 -136.0000 63.0000 60.0000
Subjectseconomic 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
Illustrationsgeologic maps; tables; photographs; graphs; photomicrographs
ProgramWestern Cordillera, Regional porphyry transitions, GEM2: Geo-mapping for Energy and Minerals
AbstractNew 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 ID297463