Geology of Grass Lakes Map Area 105G/7, Yukon-Tanana Terrane

Geological survey data describes the northeast third of Grass Lakes map area (105G/7) in the Pelly Mountains, southeastern Yukon. The area is underlain by polydeformed metasedimentary, metavolcanic, and metaplutonic rocks of Yukon-Tanana Terrane, and ultramafic rocks of unknown affinity. The data includes interpretations of rock units, structures, and the Kudz Ze Kayah massive sulphide deposit, compiled by the Government of Yukon.

Use Cases

• Map rock unit distributions based on descriptions of layered metasedimentary and metavolcanic sequences.
• Analyze structural deformation patterns based on descriptions of foliation, lineation, and south-vergent folds.
• Identify potential mineral deposit locations based on the mention of the Kudz Ze Kayah massive sulphide deposit and gossans.
• Study intrusive relationships based on descriptions of metaplutonic rocks like Grass Lakes Orthogneiss and North Lakes Metadiorite.

Strengths

• Description includes specific rock unit names and compositions, such as quartz-rich schist, psammite, and Devono-Mississippian felsic metavolcanic rocks.
• Structural interpretations are provided, including descriptions of recumbent folds and multiple phases of deformation.
• Data is associated with a known mineral deposit (Kudz Ze Kayah) and specific geological occurrences (Pack occurrence).

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 a single map area survey.

Provenance

Source

Government of Yukon

Collection Method

Geological field survey and mapping.

Freshness

Last updated 2026-04-17 15:57:43.205694; freshness should be verified.

Geography

Northeast third of Grass Lakes map area (105G/7), Pelly Mountains, southeastern Yukon.