Potassium in the Earth’s core?

Geßmann, C. K.; Wood, Bernard J.

doi:10.1016/s0012-821x(02)00593-9

Cited by 114 publications

(86 citation statements)

References 29 publications

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“…On the other hand, if the core-forming melt has approximately 10 wt.% S or more, a large amount of oxygen may be included because of existence of a wide miscible Fe-O-S liquid region. The high oxygen solubility is consistent with the results of Gessmann and Wood [2002] and Bouhifd et al [2007]. They have investigated the reaction between Fe-S melts and silicates, and maximum of 8.7 wt.% O was incorporated into the Fe-S melts at pressures of 2.5 and 5 GPa.…”

Section: Resultssupporting

confidence: 85%

In situ observation and determination of liquid immiscibility in the Fe‐O‐S melt at 3 GPa using a synchrotron X‐ray radiographic technique

Tsuno¹,

Terasaki²,

Ohtani³

et al. 2007

Geophysical Research Letters

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We have performed in situ experiments on liquid immiscibility in Fe‐O‐S melts at 3 GPa and up to 2203 K using a synchrotron X‐ray radiographic technique. The difference between immiscible melts and a miscible melt can be clearly observed in radiographs. The immiscibility gap of the Fe‐O‐S melt shrinks with increasing temperature at 3 GPa. Two separated phases appeared from a miscible melt during quenching. Without in situ observations, the two phases observed in quench textures would be interpreted as either quench products from primary immiscible melts at high temperature, or those exsolved from a homogeneous melt to immiscible melts passing through the stability field of immiscible melts during quenching. In situ measurements are required in order to determine the immiscibility gap of the liquid Fe with light element(s). Our results have important implications for the formation and chemical composition of the cores of Earth and Mars.

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Section: Resultssupporting

confidence: 85%

In situ observation and determination of liquid immiscibility in the Fe‐O‐S melt at 3 GPa using a synchrotron X‐ray radiographic technique

Tsuno¹,

Terasaki²,

Ohtani³

et al. 2007

Geophysical Research Letters

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“…The KamLAND group has recently released the first results from a search for geoneutrinos with 31 10 09 . 7 × target proton-years exposure [14].…”

Section: Kamland Observationmentioning

confidence: 99%

Neutrino geophysics with KamLAND and future prospects

Enomoto

Ohtani

Inoue

et al. 2007

Earth and Planetary Science Letters

143

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The Kamioka liquid scintillator anti-neutrino detector (KamLAND) is a low-energy and low-background neutrino detector which could be a useful probe for determining the U and Th abundances of the Earth. We constructed a model of the Earth in order to evaluate the rate of geologically produced anti-neutrinos (geoneutrinos) detectable by KamLAND. We found that KamLAND can be used to determine the absolute abundances of U and Th in the Earth with an accuracy sufficient for placing important constraints on Earth's accretion and succeeding thermal history. Within the uncertainty of the measurement, the present observation of geoneutrinos with KamLAND is consistent with our model prediction based on the bulk silicate Earth (BSE) composition. If a neutrino detector were to be built in Hawaii, where effects of the continental crust would be negligible, it could be used to estimate the U and Th content in the lower mantle and the core. Our calculation of the geoneutrino event rate on the Earth's surface indicates that geoneutrino observation can provide key information for testing the current models of the U and Th content and distribution in the Earth.

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“…The light alloying elements most commonly suggested include S, O, Si, H and C, although minor amounts of other elements, such K, could also be present (e.g. Poirier, 1994;Gessmann andWood, 2002, Alfè et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

The stability of bcc-Fe at high pressures and temperatures with respect to tetragonal strain

Vočadlo

Wood

Gillan

et al. 2008

Physics of the Earth and Planetary Interiors

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe phase that iron adopts at the conditions of the Earth's inner core is still unknown. The two primary candidates are the hexagonal-close-packed (hcp) structure and the bodycentred-cubic (bcc) structure polymorphs. Until recently, the former was favoured, but it now seems possible that bcc iron could be present. A remaining uncertainty regarding the latter phase is whether or not bcc iron is stable with respect to tetragonal strain under core conditions. In this paper, therefore, we present the results of high precision ab initio free energy calculations at core pressures and temperatures performed on bcc iron as a function of tetragonal strain. Within the uncertainties of the calculations, direct comparison of free energy values suggests that bcc may be unstable with respect to tetragonal strain at 5500 K; this is confirmed when the associated stresses are taken into account. However, at 6000 K, the results indicate that the bcc phase becomes more stable, although it is unclear as to whether complete stability has been achieved. Nevertheless, it remains distinctly possible that the addition of light elements could stabilise this structure convincingly. Therefore, bcc-Fe cannot be ruled out as a candidate inner core phase.

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Potassium in the Earth’s core?

Cited by 114 publications

References 29 publications

In situ observation and determination of liquid immiscibility in the Fe‐O‐S melt at 3 GPa using a synchrotron X‐ray radiographic technique

In situ observation and determination of liquid immiscibility in the Fe‐O‐S melt at 3 GPa using a synchrotron X‐ray radiographic technique

Neutrino geophysics with KamLAND and future prospects

The stability of bcc-Fe at high pressures and temperatures with respect to tetragonal strain

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