Mantle plumes sample heterogeneous mixtures of oxidized and reduced lithologies

Nicklas, Robert W.; Baxter, Ethan F.; Brandon, Alan D.; Lonero, Andrew J.; Day, James M.D.

doi:10.1016/j.chemgeo.2023.121897

Chemical Geology

2024

DOI: 10.1016/j.chemgeo.2023.121897

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Mantle plumes sample heterogeneous mixtures of oxidized and reduced lithologies

Robert W. Nicklas,

Ethan F. Baxter,

Alan D. Brandon

et al.

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2024

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Oxygen Fugacity of Global Ocean Island Basalts

Willhite,

Arevalo,

Piccoli

et al. 2024

Geochem Geophys Geosyst

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Mantle plumes contain heterogenous chemical components and sample variable depths of the mantle, enabling glimpses into the compositional structure of Earth's interior. In this study, we evaluated ocean island basalts (OIB) from nine plume locations to provide a global and systematic assessment of the relationship between fO2 and He‐Sr‐Nd‐Pb‐W‐Os isotopic compositions. Ocean island basalts from the Pacific (Austral Islands, Hawaii, Mangaia, Samoa, Pitcairn), Atlantic (Azores, Canary Islands, St. Helena), and Indian Oceans (La Réunion) reveal that fO2 in OIB is heterogeneous both within and among hotspots. Taken together with previous studies, global OIB have elevated and heterogenous fO2 (average = +0.5 ∆FMQ; 2SD = 1.5) relative to prior estimates of global mid‐ocean ridge basalts (MORB; average = −0.1 ∆FMQ; 2SD = 0.6), though many individual OIB overlap MORB. Specific mantle components, such as HIMU and enriched mantle 2 (EM2), defined by radiogenic Pb and Sr isotopic compositions compared to other OIB, respectively, have distinctly high fO2 based on statistical analysis. Elevated fO2 in OIB samples of these components is associated with higher whole‐rock CaO/Al2O3 and olivine CaO content, which may be linked to recycled carbonated oceanic crust. EM1‐type and geochemically depleted OIB are generally not as oxidized, possibly due to limited oxidizing potential of the recycled material in the enriched mantle 1 (EM1) component (e.g., sediment) or lack of recycled materials in geochemically depleted OIB. Despite systematic offset of the fO2 among EM1‐, EM2‐, and HIMU‐type OIB, geochemical indices of lithospheric recycling, such as Sr‐Nd‐Pb‐Os isotopic systems, generally do not correlate with fO2.

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Oxygen Fugacity of Global Ocean Island Basalts

Willhite,

Arevalo,

Piccoli

et al. 2024

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

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Mantle plumes sample heterogeneous mixtures of oxidized and reduced lithologies

Cited by 1 publication

References 75 publications

Oxygen Fugacity of Global Ocean Island Basalts

Oxygen Fugacity of Global Ocean Island Basalts

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