2008
DOI: 10.1098/rsta.2008.0147
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The redox state of the mantle during and just after core formation

Abstract: Siderophile elements are depleted in the Earth's mantle, relative to chondritic meteorites, as a result of equilibration with core-forming Fe-rich metal. Measurements of metal-silicate partition coefficients show that mantle depletions of slightly siderophile elements (e.g. Cr, V ) must have occurred at more reducing conditions than those inferred from the current mantle FeO content. This implies that the oxidation state (i.e. FeO content) of the mantle increased with time as accretion proceeded. The oxygen fu… Show more

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Cited by 95 publications
(52 citation statements)
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“…The removal of Fe 0 left the primitive lower mantle with a relative Fe 3+ excess (Frost et al, 2008), and thus a relative excess of oxygen, compared to the present day mantle. The true oxygen excess in the primitive lower mantle was controlled by two main parameters: (i) the amount of Bg present in the lower mantle when the Fe 0 segregation stopped.…”
Section: An Oxygen Excess Stored In the Primordial Lower Mantlementioning
confidence: 99%
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“…The removal of Fe 0 left the primitive lower mantle with a relative Fe 3+ excess (Frost et al, 2008), and thus a relative excess of oxygen, compared to the present day mantle. The true oxygen excess in the primitive lower mantle was controlled by two main parameters: (i) the amount of Bg present in the lower mantle when the Fe 0 segregation stopped.…”
Section: An Oxygen Excess Stored In the Primordial Lower Mantlementioning
confidence: 99%
“…However, the core-mantle segregation induced drainage of Fe 0 droplets from the molten mantle down into the core, which resulted in a large Fe 3+ excess in the primordial lower mantle (Frost et al, 2008). This excess became a potential source of oxygen for the shallow mantle and the Earth's surface.…”
Section: Introductionmentioning
confidence: 99%
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“…Experiments have shown 13 that, at the pressure of the lower mantle, iron(II) oxide is converted into iron metal and iron(III) oxide -which means that large bodies such as Earth can self-oxidize their mantle, whereas smaller ones cannot (or do so to a lesser extent). In other words, a nominally dry mantle can be oxidized.…”
mentioning
confidence: 99%
“…This reaction, first proposed by Javoy (1995), which plays a key role on the estimation of the deep mantle compositions in the E-chondrites framework (Javoy et al 2010;Kaminski and Javoy 2013), is now acknowledged in core chemistry research (e.g., Frost et al 2008) and is explained in detail below.…”
Section: The E-earth Framework: the Link Between Enstatite Chondritesmentioning
confidence: 97%