Re-Os geochronology of molybdenite by LA-ICP-MS/MS
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Abstract
Re-Os geochronology is a powerful tool to directly date sulphide mineralisation using phases such as molybdenite, pyrite and chalcopyrite. We present a snapshot of a method in development utilizing laser ablation inductively coupled-plasma ‘triple quad’ mass spectrometry (LA-ICP-MS/MS) for Re-Os geochronology of molybdenite. While traditional LA-(MC)-ICP-MS measurements are limited by the >90% isobaric interference correction of parent radioactive 187Re on radiogenic daughter 187Os, the MS/MS technology minimizes this correction through careful instrument tuning and use of a (CH4 + H2 + He) reaction gas mixture to mass shift 187Os away from 187Re. We demonstrate the potential of the MS/MS technique by presenting robust Re-Os dates for three different molybdenite samples ranging in age from ~28 to 1520 Ma.
Suggested Citation
Souders, A., Thompson, J.M., 2025, Re-Os geochronology of molybdenite by LA-ICP-MS/MS, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1169-1172.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Re-Os geochronology of molybdenite by LA-ICP-MS/MS |
| Volume | 3 |
| Year Published | 2025 |
| Language | English |
| Publisher | Society for Geology Applied to Mineral Deposits (SGA) |
| Contributing office(s) | Geology, Geophysics, and Geochemistry Science Center |
| Description | 4 p. |
| First page | 1169 |
| Last page | 1172 |
| Conference Title | 18th SGA Biennial Meeting |
| Conference Location | Golden, CO |
| Conference Date | August 3-7, 2025 |