Wrangell Lavas Composition and Stratigraphy in Yukon's St. Clare Province

The Wrangell lavas in southwestern Yukon comprise subalkaline basalt (31%), basaltic andesite (30%), andesite (21%), dacite (2%) and nepheline normative basalt (16%). This dataset from the Government of Yukon describes the mineralogy and stratigraphy of these volcanic rocks within the Late Cenozoic Wrangell volcanic belt. The chemical composition of the lavas reflects a transitional tectonic environment influenced by regional transpression and subduction.

Use Cases

• Classify volcanic rock types based on the detailed mineralogical descriptions of phenocryst assemblages.
• Analyze the relationship between rock chemistry and tectonic setting based on the described Na2O+K2O/SiO2 and FeO/MgO ratios.
• Model stratigraphic sequences in the St. Clare province based on descriptions of interbedded lavas, sediments, and pyroclastic rocks.
• Study the distribution of alkaline versus subalkaline magma series within the Wrangell volcanic belt.

Strengths

• Provides precise quantitative breakdowns of rock type percentages (e.g., 31% subalkaline basalt).
• Includes detailed mineralogical descriptions for each major rock type (e.g., spinel-olivine-plagioclase phyric basalt).
• Describes the stratigraphic succession and spatial distribution (central vs. southern map area) of the lavas.

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 map area studied.

Provenance

Source

Government of Yukon | Gouvernement du Yukon

Time Range

Late Cenozoic

Freshness

Last updated 2026-04-17 15:54:15.506058; freshness should be verified.

Geography

St. Clare province, St. Elias Mountains, Yukon, Canada