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Award ID contains: 2135828

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  1. ; ; (, Nature Communications)
    Abstract To gain insights into the composition and heterogeneity of Earth’s interior, the partial pressure of oxygen (oxygen fugacity, orfO2) in igneous rocks is characterized. A surprising observation is that relative to reference buffers,fO2s of mantle melts (mid-ocean ridge basalts, or MORBs) and their presumed mantle sources (abyssal peridotites) differ. Globally, MORBs have near-uniformfO2s, whereas abyssal peridotites vary by about three orders of magnitude, suggesting these intimately related geologic reservoirs are out of equilibrium. Here, we characterizefO2s of mantle melting increments represented by plagioclase-hosted melt inclusions, which were entrapped as basaltic melts migrated from their sources toward the seafloor. At temperatures andfO2s constrained by rare earth element distributions, a range offO2s consistent with the abyssal peridotites is recovered. ThefO2s are correlated with geochemical proxies for mantle melting, suggesting partial melting of Earth’s mantle decreases itsfO2, and that the uniformity of MORBfO2s is a consequence of the melting process and plate tectonic cycling. 
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  2. ; ; ; (, 2023 AGU Fall Conference)
    Daynes, O.*, Ustunisik, G., Nielsen, R. L., and Betts, M.*, “Correlation of Depth of Differentiation to Tectonic Setting: Evidence from Plagioclase Ultraphyric Basalts” Presentation at American Geophysical Union (AGU) Fall Meeting, Chicago, IL (December 11-15, 2023). 
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    Accepted Manuscript Full Text Available
  3. ; ; ; (, 2023 AGU Fall Conference)
    Betts, M.*, Ustunisik, G., Nielsen, R. L., and Daynes, O.*, “The Early Stages of Petrogenesis of Mid-Ocean Ridge (MOR) Magmas as Evidenced by Plagioclase Megacryts and their Melt Inclusions (MI)” Presentation at American Geophysical Union (AGU) Fall Meeting, Chicago, IL (December 11-15, 2023). 
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    Accepted Manuscript Full Text Available
  4. (, 2023 AGU Fall Conference)
    Nielsen, R. L. and Ustunisik, G., “Using Petrography, CO2 Contents of Melt Inclusions, and Phase Equilibria Experiments to Understand the Petrogenesis of Plagioclase Ultraphyric Basalts (PUB) in Mid Ocean Ridges (MOR) ” Presentation at American Geophysical Union (AGU) Fall Meeting, Chicago, IL (December 11-15, 2023). 
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    Accepted Manuscript Full Text Available
  5. ; ; ; (, Proceedings of 2023 Goldschmidt Conference)
    Betts, M.*, Ustunisik, G., Nielsen, R. L., and Daynes, O.*, “Sampling Patterns of Mid-Ocean Ridge (MOR) Magmas as Evidenced by Plagioclase Megacryts and their Melt Inclusions (MI)” Presentation at Goldschmidt Conference, Lyon, France (July 9-14, 2023). 
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    Full Text Available 
  6. ; ; ; ; (, Proceedings of 2023 Goldschmidt Conference)
    Daynes, O.*, Ustunisik, G., and Nielsen, R. L., and Betts, M.*, “Depth of Formation of Petrogenetic Processes: Evidence from Plagioclase-Hosted Melt Inclusions” Presentation at Goldschmidt Conference, Lyon, France (July 9-14, 2023). 
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    Full Text Available