Petrogenesis and mineralization potential of the Bradley Peak komatiitic basalts, Wyoming Province
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Abstract
The ca. 2.72 Ga Bradley Peak greenstone terrane in the Wyoming Province contains spinifex- and cumulate-textured komatiitic volcanic rocks that may host Ni-Cu-PGE sulfide mineralization. New whole rock geochemistry classifies these rocks as Al-undepleted komatiitic basalts derived from a parental melt with ~17 wt. % MgO. Isotopic data (Sm-Nd, Re-Os) and REE profiles suggest a plume source and possible assimilation of juvenile footwall volcanic rocks. Calculated sulfur concentrations at sulfide saturation and low-detection PGE geochemistry indicate these magmas did not saturate a sulfide liquid resulting in sulfide mineralization. Although the Bradley Peak komatiitic basalt flows are unlikely to host magmatic sulfide mineralization, they are likely the source of Au for regional orogenic gold deposits.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Petrogenesis and mineralization potential of the Bradley Peak komatiitic basalts, Wyoming Province |
| Volume | 2 |
| Year Published | 2025 |
| Language | English |
| Publisher | Society of Geology Applied to Mineral Deposits |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | 4 p. |
| First page | 615 |
| Last page | 618 |
| Conference Title | 18th SGA Biennial Meeting |
| Conference Location | Golden, CO |
| Conference Date | August 3-7, 2025 |
| Country | United States |
| State | Wyoming |
| Other Geospatial | Seminoe Mountains |