| Titre | New geo- and thermochronological insights into Jurassic accretion and syn-orogenic sedimentation in the northern Canadian Cordillera |
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| Auteur | Kellett, D ;
Zagorevski, A |
| Source | GAC-MAC-IAH Where geosciences converge, Québec 2019, abstracts/AGC-AMC-AIH Où les géosciences convergent, Québec 2019, résumés; Association géologique du Canada-Association minéralogique du Canada,
Réunion annuelle, Programme et résumés vol. 42, 2019 p. 118  Accès ouvert |
| Liens | Online - En ligne (complete volume, volume
complet, PDF, 6.08 MB)
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| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190402 |
| Éditeur | Association géologique du Canada |
| Réunion | GAC-MAC-IAH 2019 / AGC-AMC-AIH 2019; Québec City, QC; CA; mai 12-15, 2019 |
| Document | publication en série |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf |
| Province | Colombie-Britannique; Yukon |
| SNRC | 94; 95; 104; 105; 114; 115 |
| Lat/Long OENS | -141.0000 -120.0000 64.0000 56.0000 |
| Sujets | antécédents tectoniques; antecedents thermiques; accretion; antecedents de sedimentation; sédimentation; milieu sédimentaire; raccourcissement de la croûte; déformation; érosion; origine; minéraux
détritiques; datation radiométrique; datation au uranium-plomb; datations au zircon; Cordillère canadienne; Groupe de Laberge ; Terrane de Yukon-Tanana; Stikinie; Terrane de Slide Mountain ; Terrane de Cache Creek ; géochronologie; tectonique;
Sciences et technologie; Nature et environnement; Phanérozoïque; Mésozoïque; Jurassique |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Évolution tectonique du Yukon, haut mésozoïque au tertiaire de l'ouest de la
Cordillère |
| Diffusé | 2019 05 01 |
| Résumé | (disponible en anglais seulement)
The Early to Middle Jurassic accretion to the Laurentian margin of the so-called Intermontane terranes (Slide Mountain, Yukon Tanana, Stikinia/Quesnellia and
Cache Creek) was the first major accretionary event forming the northern Canadian Cordillera. The Late Triassic to Cretaceous sedimentary record of the northern Canadian Cordillera, including northern British Columbia and southern Yukon, captures
several aspects of the collisional event, including changes in depositional environment and basin extent, shifts in sediment types and provenance, and syn- to post-depositional basin shortening and deformation. In particular, recent and new
geochronological and thermochronological data from the syn-tectonic Laberge Group, deposited into the Whitehorse trough in Early to Middle Jurassic, provide new constraints on sediment provenance, depositional constraints, and timing and conditions
of basin deformation. Detrital zircon U-Pb age populations and double dating (U-Pb and (U-Th)/He) track the construction and collapse of Stikinia's early Mesozoic volcanic edifice through Early to Middle Jurassic. Local occurrence of detrital
muscovite records the exhumation and erosion of Early Jurassic metamorphic rocks. Rutile in clasts of eclogite record rapid exhumation from high pressure conditions during Early Jurassic. These dated metamorphic detritus coincide with regional
cooling ages of the exposed mid-crust of Yukon Tanana terrane. Following deposition of the Laberge Group, the strata were shortened during Middle Jurassic-Early Cretaceous, with the western portion of the basin buried most deeply during shortening,
evidenced by resetting of He in detrital zircon. These and emerging new thermochronological data contribute to a reconstruction of the tectonic setting of accretion of the Intermontane terranes. |
| GEOSCAN ID | 321677 |
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