Potassium argon analyses of biotite and hornblende indicate a concordant Upper Eocene age for lamprophyre sills. Rubidium strontium isotopic data indicates a 87 Sr/86 Sr ratio of 0.7066, with a calculated initial ratio of 0.7065 using a 40.3 Ma age. The data was collected by Archer, Cathro and Associates Limited in 1977 and is published by the Government of Yukon.
Use Cases
- Determine rock age based on potassium argon analyses of biotite and hornblende
- Analyze isotopic ratios based on rubidium strontium data
- Study alkalic igneous rock characteristics in anorogenic settings based on the initial Sr ratio
Strengths
- Specific isotopic ratios are provided, including a 87 Sr/86 Sr ratio of 0.7066
- A calculated initial ratio of 0.7065 is given using a 40.3 Ma age
- The geological context and location (MacMillan Pass, Yukon Territory) are clearly stated
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 temporal bias inherent to the 1977 collection date
Provenance
- Source
- Government of Yukon
- Collection Method
- Field study and laboratory isotopic analysis conducted by Archer, Cathro and Associates Limited
- Time Range
- Upper Eocene age (approximately 40.3 million years ago)
- Freshness
- Last updated 2026-04-17 15:40:22.293173; freshness should be verified
- Geography
- MacMillan Pass, Yukon Territory, Canada