Densities of the Molten Fes, Fes–Cu&lt;SUB&gt;2&lt;/SUB&gt;S and Fe–S–O Systems—Utilizing A Bottom-Balance Archimedean Technique

Kaiura, G. H.; Toguri, J. M.

doi:10.1179/000844379795317878

Cited by 12 publications

(4 citation statements)

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“…From phase equilibria of the Fe-FeS system (Usselman, 1975), the S content of the metallic melt might plausibly have ranged from 31 wt% at the FeS eutectic, to $22 wt% in the case of anatexis up to 1300°C (Singletary and Grove, 2003; assuming solid FeS was not exhausted in the source). The corresponding density range for 1200-1300°C S-rich metallic melts is approximately 4200-5200 kg m À3 (Nagamori, 1969;Usselman, 1975;Kaiura and Toguri, 1979). Density for the picriticultramafic sort of silicate melt that could plausibly yield cumulates virtually devoid of plagioclase would be $2800 kg m À3 .…”

Section: Cumulus Processing?mentioning

confidence: 98%

Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation

Warren¹,

Ulff-Møller²,

Huber³

et al. 2006

Geochimica et Cosmochimica Acta

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Section: Cumulus Processing?mentioning

confidence: 98%

Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation

Warren¹,

Ulff-Møller²,

Huber³

et al. 2006

Geochimica et Cosmochimica Acta

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“…However, the original mass of chondritic material that produced the late, P-rich melt was much smaller (perhaps 5·) than the mass that had produced the S-rich melt. After allowance for the difference in density ($7.4 g cm À3 for the P-rich magma, $4.3 g cm À3 for the S-rich magma (Kaiura and Toguri, 1979)), we obtain a volume of the outer core that was $7· larger than that of the inner core. An asteroid with a radius of 20 km and an initial porosity of 50% could have produced an inner core with a radius of $3 km and a combined core with a radius $6 km.…”

Section: Coexistence and Evolution Of Dual Cores In The Iid Asteroidmentioning

confidence: 99%

Compositional trends among IID irons; their possible formation from the P-rich lower magma in a two-layer core

Wasson

Huber

2006

Geochimica et Cosmochimica Acta

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“…If volumes in the system Fe-O were well enough known, it would be possible to predict whether oxygen solubility increases or decreases with pressure. Walker et al (2002) O'Neill et al (1998) cited the value of ~19 cm 3 / mole at 1350°C, 1 bar, from Kaiura & Toguri (1979). This is a remarkably large value compared to Wüs -V ≈ 13 cm 3 /mole for wüstite at the same P and T (Hazen & Jeanloz 1984).…”

Section: Thermal Perturbationsmentioning

confidence: 93%

“…Likewise, X-ray fl uorescence in conjunction with excitation in a synchrotron beam is not very useful for X-rays emitted by oxygen (~½ keV), which would be too strongly absorbed by the diamond anvils to be detectable. Excitation of Fe X-rays (~6 keV) is Kaiura & Toguri (1979) and Wüs -V of ~13 cm 3 /mole from Hazen & Jeanloz (1984). The data point centered on 200 kbar is based on fi tting the multi-anvil (MA) data of Rubie et al (2004).…”

Section: An Alternative Strategy: Lh-dac-xri-srimentioning

confidence: 99%

Core Mantle Chemical Issues

Walker¹

2005

The Canadian Mineralogist

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Is the core's chemical isolation from the mantle complete? This is an important question for the balancing of the persistently enigmatic budgets of the highly siderophile elements and PGE, to which Fleet's work has contributed so much. On redox criteria alone, it is clear that the core and the mantle cannot be in bulk equilibrium, and therefore that there are chemical incentives for core-mantle exchange. Recent Os isotope evidence suggests that the core may indeed be leaking chemically (although some W isotope evidence does not encourage this view). Possible mechanisms of chemical transfer between core and mantle include the following.(1) Cooling of the Earth provides a temperature perturbation that affects solubility in the outer core of the oxides, sulfi des, carbides, hydrides, and silicates with which inevitably the outer core becomes saturated. Cooling and buoyancy lead to a progressive transfer of liquid (or crystalline) precipitates to the mantle. Solubilities of nonmetals in the core need determination.(2) Electromagnetic effects arising from core dynamo action can also drive core-mantle transfers. Interesting phase-changes, electrowetting, and dramatic trace-element chemical fractionation effects are driven by ~1 V potentials. The electronic character of, and voltages across, the core-mantle boundary (CMB) need determination. (3) Chemical transfers can be forced by emplacement of chemically incompatible assemblages into the CMB region. The redox imbalance between the core and oxidized slab material subducted to the CMB will certainly require chemical re-adjustments, most plausibly leading to core-to-mantle transfer of mass. The current debate about whether the chemical signature seen in some plumes is recycled crust or core need not have an exclusive "either/or" resolution. Recycled material could be key in refl uxing core material into the mantle.Keywords: Earth's core, mantle geochemistry, redox, oxygen solubility, electrochemistry, titration, crustal recycling, refl ux digestion. SOMMAIREL'isolation chimique du noyau en présence du manteau est-elle complète? Il s'agit d'une question importante pour le bilan des budgets toujours enigmatiques des éléments fortement sidérophiles et des éléments du groupe du platine, domaines auxquels Michael Fleet a tellement contribué. En considérant seuls les critères de redox, il semble évident que le noyau et le manteau ne peuvent pas globalement être à l'équilibre, et donc il y aurait des incitations chimiques favorisant les échanges entre noyau et manteau. D'après les données récentes sur les isotopes d'osmium, le noyau pourrait bien être en train de subir des fuites, quoique certaines observations au sujet des isotopes de W ne favorisent guère ce point de vue. Parmi les mécanismes possibles de tranfert chimique entre noyau et manteau se trouvent les possibilités suivantes. (1) Un refroidissement de la Terre provoque une perturbation thermique qui affecte la solubilité dans le noyau externe des oxydes, sulfures, carbures, hydrides, et silicates avec lesque...

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Densities of the Molten Fes, Fes–Cu<SUB>2</SUB>S and Fe–S–O Systems—Utilizing A Bottom-Balance Archimedean Technique

Cited by 12 publications

References 0 publications

Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation

Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation

Compositional trends among IID irons; their possible formation from the P-rich lower magma in a two-layer core

Core Mantle Chemical Issues

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