Ammonium Geochemistry Near Selwyn Basin Sedimentary Exhalative Deposits

A 2026 study analyzes ammonium (NH4) content in feldspars near five shale-hosted stratiform Pb-Zn-Ag deposits in the Selwyn Basin. The research compares deposits at Howards Pass, Driftpile, Clear Lake, Tom, and Jason, measuring NH4 concentrations up to 2000 ppm to evaluate its use as an exploration tool.

Use Cases

• Analyze NH4 concentration patterns in feldspars to identify geochemical halos around deposits like Howards Pass and Clear Lake.
• Compare NH4 geochemistry across five deposit sites (Howards Pass, Driftpile, Clear Lake, Tom, Jason) to assess halo consistency.
• Model NH4 halo formation by comparing Selwyn Basin data to modern analogous systems like the Guaymas Basin.

Strengths

• Focuses on five specific, named mineral deposits for comparative analysis.
• Reports measured NH4 concentrations reaching as high as 2000 ppm.
• Proposes a model linking observed anomalies to active hydrothermal systems.

Limitations

• No raw data table, columns, or sample data is provided; analysis is presented in a narrative HTML report.
• Study notes evidence that NH4 halos around some deposits were disturbed by detrital input, indicating data complexity.
• Specific sample counts, spatial coordinates, or structured data rows are unavailable.

Provenance

Source

Government of Yukon

Collection Method

Geochemical study comparing NH4 content near five shale-hosted stratiform deposits.

Time Range

null

Freshness

Last updated March 2026.

Geography

Selwyn Basin, including deposits at Howards Pass, Driftpile (Gataga District), Clear Lake, Tom, and Jason (Macmillan Pass).