Journal article
Dissecting the Re-Os molybdenite geochronometer
Scientific Reports, Vol.7(1)
2017
Abstract
Rhenium and osmium isotopes have been used for decades to date the formation of molybdenite (MoS2), a common mineral in ore deposits and the world’s main source of molybdenum and rhenium. Understanding the distribution of parent 187Re and radiogenic daughter 187Os isotopes in molybdenite is critical in interpreting isotopic measurements because it can compromise the accurate determination and interpretation of mineralization ages. In order to resolve the controls on the distribution of these elements, chemical and isotope mapping of MoS2 grains from representative porphyry copper-molybdenum deposits were performed using electron microprobe and nano-scale secondary ion mass spectrometry. Our results show a heterogeneous distribution of 185,187Re and 192Os isotopes in MoS2, and that both 187Re and 187Os isotopes are not decoupled as previously thought. We conclude that Re and Os are structurally bound or present as nanoparticles in or next to molybdenite grains, recording a complex formation history and hindering the use of microbeam techniques for Re-Os molybdenite dating. Our study opens new avenues to explore the effects of isotope nuggeting in geochronometers.
Details
- Title
- Dissecting the Re-Os molybdenite geochronometer
- Authors/Creators
- F. Barra (Author/Creator) - University of ChileA. Deditius (Author/Creator) - Murdoch UniversityM. Reich (Author/Creator) - University of ChileM.R. Kilburn (Author/Creator) - The University of Western AustraliaP. Guagliardo (Author/Creator) - The University of Western AustraliaM.P. Roberts (Author/Creator) - The University of Western Australia
- Publication Details
- Scientific Reports, Vol.7(1)
- Publisher
- Springer Nature
- Identifiers
- 991005541098807891
- Copyright
- © 2017 The Author(s)
- Murdoch Affiliation
- School of Engineering and Information Technology
- Language
- English
- Resource Type
- Journal article
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- 8 Earth Sciences
- 8.8 Geochemistry, Geophysics & Geology
- 8.8.1 Geochemical Petrogenesis
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- Geosciences