Duke River Fault Geological Mapping and Analysis in Southwest Yukon

Preliminary 40Ar/39Ar ages from muscovite grains range from 90-104 Ma, suggesting Cretaceous movement along the Duke River fault. Detailed geological mapping and sampling of three key areas along this terrane-bounding structure was completed in August 2009. The Government of Yukon produced this dataset, which examines the relationships between the Alexander terrane and Wrangellia.

Use Cases

• Analyze thrust fault kinematics based on shear bands, fold orientations, and rotated grains described in the mapping.
• Model tectonic displacement timing based on preliminary 40Ar/39Ar ages from muscovite grains.
• Study deformation of Miocene intrusions and tuffs to infer fault activity into the Pliocene.
• Compare structural styles between multiply folded Alexander terrane rocks and low-grade Wrangellian rocks.

Strengths

• Mapping and sampling was completed in three key areas along the fault in August 2009.
• Preliminary 40Ar/39Ar ages provide a specific Cretaceous time range of 90-104 Ma.
• Description includes specific geological features like shear bands, mica fish, and lineations.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the specific fault study area.

Provenance

Source

Government of Yukon

Collection Method

Detailed geological mapping and sampling.

Time Range

Fieldwork completed August 2009; fault movement inferred from Cretaceous to Pliocene.

Freshness

Last updated 2026-04-17 15:38:56.011918; freshness should be verified.

Geography

Duke River fault, southwest Yukon.