Hybrid magmatic REE / basin brine path

This hybrid system operates where CO2- and HF-bearing magmatic volatiles condense into basinal brines that replace carbonate with fluorspar ± barite, REE, Ti, Nb, Be as in the Illinois-Kentucky Fluorspar district and Hicks Dome.
Color on map:

Deposit types

Name Commodities Critical minerals
Fluorspar Fluorite Fluorite, barite, REE, Ti, Nb, Be

References


Source: Hofstra, A.H., and Kreiner, D.C., 2020, Systems-Deposits-Commodities-Critical Minerals Table for the Earth Mapping Resources Initiative: U.S. Geological Survey Open-File Report 2020-1042, 24 p., https://doi.org/10.3133/ofr20201042.

List of Earth MRI focus areas with mineral system = Hybrid magmatic REE / basin brine path

10 focus areas match these criteria.

Focus area Region States Mineral Systems Deposit types Commodities
Hicks Dome Intrusion South Central Illinois Hybrid magmatic REE / basin brine path Fluorspar lead
Illinois-Kentucky Fluorspar District South Central Illinois; Kentucky Hybrid magmatic REE / basin brine path Fluorspar lead
Big Bend alkaline rocks Southwest Texas Hybrid magmatic REE / basin brine path Fluorspar lead; silver
Burro Mountains Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar (none)
Cooks Range-Fluorite Ridge fluorite-manganese Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar molybdenum
Hansonburg district Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar copper; lead; silver
Mogollon-Wilcox-Gila fluorite districts Southwest Arizona; New Mexico Hybrid magmatic REE / basin brine path Fluorspar (none)
Palm Park (Rincon district) Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar (none)
Tortugas Mountains Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar (none)
Zuni Mountains fluorspar Southwest New Mexico Hybrid magmatic REE / basin brine path Fluorspar (none)