Results 21 to 30 of about 1,213,951 (200)

Trace element partitioning between clinopyroxene, magnetite, ilmenite and ferrobasaltic to dacitic magmas: an experimental study on the role of oxygen fugacity and melt composition [PDF]

, 2022
International audienceIlmenite-, magnetite- and clinopyroxene−melt trace element partition coefficients were investigated experimentally as a function of oxygen fugacity and melt composition in a range of synthetic ferrobasaltic bulk compositions.
Namur, Olivier, Shepherd, Kat, Toplis, Michael J., Devidal, Jean-Luc, Charlier, Bernard   +4 more
core   +2 more sources

Origin and K-Ar age of the phreatomagmatic breccia at the Trepča Pb-Zn-Ag skarn deposit, Kosovo: Implications for ore-forming processes

Geologia Croatica, 2016
The Trepča Pb-Zn-Ag skarn deposit in Kosovo is spatially and temporarily related to the phreatomagmatic breccia of Oligocene age (~23 Ma). The deposit shows features typical for skarn deposits worldwide, including a stage of isochemical metamorphism, a ...
Sabina Strmić Palinkaš, Ladislav A. Palinkaš, Magda Mandić, Zvjezdana Roller-Lutz, Zoltan Pécskay, Gani Maliqi, Vladimir Bermanec   +6 more
doaj   +1 more source

Redox controls on H and N speciation and intermolecular isotopic fractionations in aqueous fluids at high pressure and high temperature: Insights from in-situ experiments

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, Charles Le Losq, Evelyn Füri, Marie-Camille Caumon   +3 more
doaj   +1 more source

Oxygen fugacity evolution of the mantle lithosphere beneath the North China Craton

, 2021
Oxygen fugacity controls the behaviour of multivalent elements and compositions of C-O-H fluids in Earth’s mantle, which further affects the cycling of materials between the deep interior and surface of Earth. The redox state of the mantle lithosphere of
Ji-Feng Ying (7355513), Chen-Yang Ye (11854556), Hong-Fu Zhang (313561), Yan-Jie Tang (11854559), Xin-Miao Zhao (9746900)   +4 more
core   +1 more source

An experimental study of the partitioning of trace elements between rutile and silicate melt as a function of oxygen fugacity

Anais da Academia Brasileira de Ciências, 2014
Subduction zone or arc magmas are known to display a characteristic depletion of High Field Strength Elements (HFSE) relative to other similarly incompatible elements, which can be attributed to the presence of the accessory mineral rutile (TiO2) in the ...
GUILHERME MALLMANN, RAÚL O.C. FONSECA, ADOLFO B. SILVA   +2 more
doaj   +1 more source

A magma ocean origin to divergent redox evolutions of rocky planetary bodies and early atmospheres

Nature Communications, 2020
Applying first-principles molecular dynamic simulations and thermodynamic modelling, the authors suggest a vertical oxygen fugacity gradient in magma oceans of Earth, Mars, and the Moon.
Jie Deng, Zhixue Du, Bijaya B. Karki, Dipta B. Ghosh, Kanani K. M. Lee   +4 more
doaj   +1 more source

CO2‐Undersaturated Melt Inclusions From the South West Indian Ridge Record Surprisingly Uniform Redox Conditions

Geochemistry, Geophysics, Geosystems, 2023
The behavior of Fe3+ during mantle partial melting strongly influences the oxidation state of the resulting magmas, with implications for the evolution of the atmosphere's oxidation state.
Yves Moussallam, Guillaume Georgeais, Estelle F. Rose‐Koga, Kenneth T. Koga, Margaret E. Hartley, Bruno Scaillet, Clive Oppenheimer, Nial Peters   +7 more
doaj   +1 more source

Diffuse reflectance spectra for heated samples of an H5 chondrite: Importance of oxygen fugacity at heating [PDF]

, 2000
P(論文)We obtained (biconical) diffuse reflectance spectra of the Nuevo Mercurio (H5) ordinary chondrite in the 200-2500 nm wavelength region. The samples were heated in the temperature range of 800-1200℃ at constant oxygen fugacities at one log unit below
Mikouchi,Takashi, Miyamoto,Masamichi
core   +1 more source

The Olivine-Melt Equilibrium Method for Determining Oxygen Fugacity [PDF]

, 2015
In order to connect volcanic rocks and their mantle sources, it is essential to consider redox equilibria and their dependence on temperature, pressure, composition, and oxygen fugacity.
Peterman, Kenneth
core   +1 more source

Upper mantle oxygen fugacity recorded by spinel lherzolites

Nature, 1986
The oxygen fugacities ( ) recorded by rocks from the Earth's upper mantle have been the subject of much recent study and controversy1–7. Discussion has been stimulated by reported differences of several orders of magnitude between measurements made by different methods (Fig.
Mattioli, G, Wood, B
openaire   +2 more sources