Cretaceous Plutonic Rock Ages in Yukon's Logtung and Thirtymile Range

109.4 ± 0.9 Ma and 110.5 ± 0.8 Ma are laser ablation U-Pb zircon ages determined for a biotite monzogranite stock in the Logtung area. Two separate phases of the Thirtymile Stock gave ages of 102.7 ± 1.1 Ma and 100.9 ± 1.4 Ma. This dataset from the Government of Yukon provides geochronological data for plutonic rocks associated with tungsten-molybdenum and tin-tungsten mineralization.

Use Cases

• Correlating plutonic rock ages with mineralization events based on described associations with tungsten-molybdenum porphyry and skarn-style deposits.
• Comparing new laser ablation U-Pb zircon ages with previously reported hydrothermal zircon ages (~58 Ma) for the same locality.
• Analyzing the timing of magmatic phases based on ages for separate phases of the Thirtymile Stock.
• Mapping the spatial distribution of Early and mid-Cretaceous plutonic rocks in the southern Yukon based on described map areas (105B, 105C).

Strengths

• Specific U-Pb zircon ages with reported uncertainties (e.g., 109.4 ± 0.9 Ma).
• Data is associated with specific mineral occurrences and map areas (e.g., Yukon MINFILE 105B 039).
• Includes comparison to a previously reported age (~58 Ma) for the same locality.

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 open_canada, focusing on specific Yukon areas.

Provenance

Source

Government of Yukon

Collection Method

Laser ablation ICP-MS U-Pb zircon dating.

Time Range

Cretaceous period (specific ages range from ~110.5 Ma to ~100.9 Ma).

Freshness

Last updated 2026-04-17 16:01:26.564137; freshness should be verified.

Geography

Logtung and Thirtymile Range areas in southern Yukon, specifically Wolf Lake map area (105B) and Teslin map area (105C).