Iron Isotope Fractionation and the Oxygen Fugacity of the Mantle
Science, 2004 The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe 3+ /Fe 2+ of mantle ...
Williams, H +6 more
core +7 more sources
Constraints on oxygen fugacity within metal capsules [PDF]
Physics and Chemistry of Minerals, 2017 Experiments were conducted with olivine encapsulated or wrapped in five different metals (Pt, Ni, $$\hbox {Ni}_{70}\hbox {Fe}_{30}$$ , Fe, and Re) to determine the oxygen fugacity in the interior of large ...
Ulrich H. Faul +4 more
core +5 more sources
High‐Pressure Na‐Ca Carbonates in the Deep Carbon Cycle
Geophysical Monograph Series, Page 127-136., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Sergey Rashchenko +2 more
wiley +10 more sources
Oxygen Fugacity Buffers and an Interactive Calculator
Geochemistry, Geophysics, GeosystemsOxygen fugacity buffers are equilibrium phase assemblages that constrain the chemical potential of oxygen. They may be coexisting minerals or fluids, or their metastable extrapolations.
Michael Anenburg
doaj +2 more sources
A fugacity approach for generating a landfill gas trace component source term. [PDF]
, 2005 The quality of risk assessment output is determined by the input data used in environmental distribution, dispersion and exposure models. Whilst recent focus has been on the development of regulatory exposure assessment models for landfills, risk ...
Rosevear, Alan +4 more
core +7 more sources
Geophysical Monograph Series, Page 117-131., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Benjamin Black +4 more
wiley +1 more source
A new method to quantitatively control oxygen fugacity in externally heated pressure vessel experiments [PDF]
European Journal of Mineralogy, 2020 Oxygen fugacity (fO2) is a fundamental variable affecting phase equilibrium in magmas, and in externally heated pressure vessel experiments it is typically controlled by using redox buffer assemblages.
A. Alex, Z. Zajacz
doaj +1 more source
Frontiers in Earth Science, 2022 Aqueous magmatic fluids are essential to the transport of hydrogen (H), carbon (C), and nitrogen (N) from the mantle to the surface, during which changes in pressure, temperature, and redox conditions affect the chemical speciation and intermolecular ...
Celia Dalou +3 more
doaj +1 more source
The effect of oxygen fugacity on ionic conductivity in olivine
Geoscience Frontiers, 2022 Abstract The oxygen fugacity ( f O 2 ) may affect the ionic conductivity of olivine under upper mantle conditions because Mg vacancies can be produced in the crystal structure by the oxidization of iron from Fe2+ to Fe3+. Here we investigated olivine ionic conductivity at 4 GPa, as a function of temperature, crystallographic orientation ...
Hongzhan Fei, Tomoo Katsura
openaire +1 more source
Oxygen Isotopes and Volatiles in Martian Meteorite [PDF]
, 2013 Oxygen isotopes were measured in mineral separates from martian meteorites using laser fluorination and were found to be remarkably uniform in both δ18O and Δ17O, suggesting that martian magmas did not assimilate aqueously altered crust regardless of any
Channon, Melanie Beth
core +1 more source