Rb-Sr and K-Ar age determinations for muscovite-bearing blueschist in the Yukon Tanana terrane indicate a minimum metamorphic age of approximately 250 Ma and a mid-Paleozoic protolith age. The dataset, published by the Government of Yukon, describes rocks unaffected by later Jurassic or Cretaceous metamorphism and plutonism. It was last updated on April 17, 2026.
Use Cases
- Determining the timing of Late Paleozoic metamorphism based on Rb-Sr and K-Ar age determinations.
- Investigating the tectonic history of the Lewes River Arc based on the age of blueschist and eclogite.
- Analyzing the preservation of isotopic systems in high-pressure rocks unaffected by later geological events.
- Correlating metamorphic events with specific rock assemblages like phyllite, quartzite, micaschist, and serpentinite.
Strengths
- Age determinations provide a minimum metamorphic age of approximately 250 Ma.
- Description specifies the rocks are unaffected by mid-Jurassic metamorphism or mid-Cretaceous plutonism.
- Dataset is associated with a specific geological terrane (Yukon Tanana) and location (Ross River area).
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 Ross River area.
Provenance
- Source
- Government of Yukon
- Time Range
- Late Paleozoic (Permo-Triassic)
- Freshness
- Last updated 2026-04-17 16:00:41.191084; freshness should be verified.
- Geography
- Ross River Area, Yukon Tanana terrane, Yukon