Tectonic affinity of Nisutlin and Anvil assemblage strata from the Teslin tectonic zone, northern Canadian Cordillera: constraints from neodymium isotope and geochemical evidence

Article Abstract:

Geochemical and isotopic data help to establish the tectonic affinity of the sedimentary and basaltic protoliths of the Nisutlin and Anvil assemblage strata from the Teslin tectonic zone of the northern Canadian Cordillera. Two different source regions, a felsic and a basaltic-andesitic, contributed detritus to the original sediments of the Nisutlin metasedimentary rocks. Immobile trace element abundances for the Anvil assemblage greenstones are similar to calc-alkaline basalts in active continental margin settings. The Anvil assemblage could be the source of Nisutlin's juvenile material.

Usage, Observations, Geochemistry, Rocks, Metamorphic, Metamorphic rocks, Isotope geology

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Structural divergence and transpression in the Teslin tectonic zone, southern Yukon Territory

Article Abstract:

Field surveys of the structural evolution of the Teslin tectonic zone reveal convergent-dominated transpression pertaining to the Late Triassic to the Early Jurassic period as exemplified by a range of fabric orientations and shear sense. A majority of rocks pertaining to this zone appear to have been formed either depositionally or intrusively through tectonic wedging over a low-angle detachment by the early Mississippian. The survey also shows structural divergence, particularly of the east and west vergent shear type, with a number of strain domains that preserve S fabrics.

Geology, Stratigraphic, Stratigraphy, Mississippian period

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Structure and kinematic evolution of the Yukon-Tanana upland tectonites; east-central Alaska: a record of late Paleozoic to Mesozoic crustal assembly: discussion and reply

Article Abstract:

VL Hansen and C Dusel-Bacon's views on the structural and kinematic evolution of the Yukon-Tanana upland tectonites invite comment. Their proposed tectonic model for the Yukon-Tanana terrane is flawed because of their biased interpretation of structural, geochemical and geochronological data sets. They are, however, commended for synthesizing tectonite-derived kinematic data with previous lithotectonic, geochronologic and thermobarometric information that has resulted in a more refined interpretation of the nature and assembly of the Yukon-Tanana terrane.

Criticism and interpretation, Alaska, British Columbia, Dusel-Bacon, C., Hansen, V.L.

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