Amphibolite-facies metamorphism in southeast Yukon is associated with mid-Cretaceous intrusions. Contact aureoles approximately 300 m wide are developed around the 97-94 Ma Hyland and Boundary plutons, with pressure estimates ranging from ~2.5-3 kbar (9-11 km depth) to shallower levels. This assessment was published by the Government of Yukon and last updated in April 2026.
Use Cases
- Modeling pluton emplacement depths based on pressure estimates (~2.5-3 kbar) and mineral assemblages.
- Analyzing the spatial relationship between metamorphism and deformation based on syn-kinematic versus post-deformation timing.
- Comparing metamorphic conditions between different plutonic suites (e.g., Tungsten suite vs. Mount Billings batholith) using mineralogical indicators.
- Mapping contact aureole widths (approximately 300 m) around intrusions for geological surveys.
Strengths
- Provides specific pressure and depth estimates for pluton emplacement (~2.5-3 kbar, 9-11 km).
- Includes detailed mineral assemblage descriptions (andalusite + cordierite + biotite, staurolite ± andalusite ± sillimanite).
- Defines clear temporal relationships between intrusions (97-94 Ma, ca. 106 Ma) and regional deformation.
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 study area in southeast Yukon.
Provenance
- Source
- Government of Yukon
- Time Range
- Mid-Cretaceous (ca. 106 Ma to 97-94 Ma)
- Freshness
- Last updated 2026-04-17 15:51:07.496200; freshness should be verified.
- Geography
- Upper Hyland River area (NTS 105H), southeast Yukon