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Journal Articles

Hydrogenation of silicon-bearing hexagonal close-packed iron and its implications for density deficits in the inner core

Mori, Yuichiro*; Kagi, Hiroyuki*; Aoki, Katsutoshi*; Takano, Masahiro*; Kakizawa, Sho*; Sano, Asami; Funakoshi, Kenichi*

Earth and Planetary Science Letters, 634, p.118673_1 - 118673_8, 2024/05

https://doi.org/10.1016/j.epsl.2024.118673

To investigate silicon effects on the hydrogen-induced volume expansion of iron, neutron diffraction and X-ray diffraction experiments were conducted to examine hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ under high pressures and high temperatures. Neutron diffraction experiments were performed on the deuterated hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ at 13.5 GPa and 900 K, and at 12.1 GPa and 300 K. By combining the P-V-T equation of state of hcp-Fe$$_{0.95}$$Si$$_{0.05}$$, present results indicate that the hydrogen-induced volume expansion of hcp-Fe$$_{0.95}$$Si$$_{0.05}$$ is 10% greater than that of pure hcp iron. Using the obtained values, we estimated the hydrogen content that would reproduce the density deficit in the inner core, which was 50% less than that without the effect of silicon. Possible hydrogen content, $$x$$, in the inner core and the outer core was calculated to be 0.07 and 0.12-0.15, respectively, when reproducing the density deficit of the inner core with hcp-Fe$$_{0.95}$$Si$$_{0.05}$$Hx.

Journal Articles

Reconstructing the thermal structure of shallow crust in the Tono region using multi-OSL-thermometry of K-feldspar from deep borehole core

Ogata, Manabu; King, G. E.*; Herman, F.*; Sueoka, Shigeru

Earth and Planetary Science Letters, 591, p.117607_1 - 117607_14, 2022/08

https://doi.org/10.1016/j.epsl.2022.117607
 Times Cited Count：2 Percentile：0.01(Geochemistry & Geophysics)

Optically stimulated luminescence (OSL)-thermometry can be used to reconstruct the thermal structure in slowly denuded regions where infrared stimulated luminescence (IRSL) signals of samples obtained from deep boreholes are measured and evaluated with depth. Until now, only one study has explored this approach, using a target mineral of Na-feldspar. In this study, we applied multi-OSL-thermometry to K-feldspar obtained from deep borehole core samples (MIZ-1) drilled at the Tono region, central Japan, which is a well-documented thermally stable crustal environment. The inverted temperature for the IRSL 50 $$^{circ}$$C of the samples at a depth of $$sim$$1 km ($$sim$$40 $$^{circ}$$C) were consistent with the in-situ temperature. The results suggest that the application of OSL-thermometry to K-feldspar in a borehole is useful to reconstruct the paleothermal condition.

Journal Articles

Scaling ${it in situ}$ cosmogenic nuclide production rates using analytical approximations to atmospheric cosmic-ray fluxes

Lifton, N.*; Sato, Tatsuhiko; Dunai, T. J.*

Earth and Planetary Science Letters, 386, p.149 - 160, 2014/01

https://doi.org/10.1016/j.epsl.2013.10.052
 Times Cited Count：508 Percentile：99.89(Geochemistry & Geophysics)

We have developed a new scaling model based on analytical approximations to modeled fluxes of the main atmospheric cosmic-ray particles responsible for ${it in situ}$ cosmogenic nuclide production. A key advantage of this new model over previous Monte Carlo models of cosmogenic nuclide production is that it allows for the rapid estimation of scaling factors based on flexible geomagnetic and solar inputs - as newer and better records become available, the model is parameterized to allow their substitution.

Journal Articles

$$^{230}$$Th and $$^{232}$$Th distributions in mid-latitudes of the North Pacific Ocean; Effect of bottom scavenging

Okubo, Ayako; Obata, Hajime*; Gamo, Toshitaka*; Yamada, Masatoshi*

Earth and Planetary Science Letters, 339-340, p.139 - 150, 2012/07

https://doi.org/10.1016/j.epsl.2012.05.012
 Times Cited Count：39 Percentile：72.16(Geochemistry & Geophysics)

Vertical distributions of total $$^{230}$$Th and dissolved $$^{232}$$Th were determined in the mid-latitudes of the North Pacific Ocean. Th in the Pacific Ocean have been described well using the reversible-scavenging model. However, we observed the depletion of total Th. The enhanced vertical eddy diffusion derived from the complex topography of the western Pacific Ocean might promote bottom scavenging and transport of the low Th in deep water to the upper layers.

Journal Articles

Density of high-Ti basalt magma at high pressure and origin of heterogeneities in the lunar mantle

Sakamaki, Tatsuya*; Otani, Eiji*; Urakawa, Satoru*; Suzuki, Akio*; Katayama, Yoshinori; Zhao, D.*

Earth and Planetary Science Letters, 299(3-4), p.285 - 289, 2010/11

https://doi.org/10.1016/j.epsl.2010.09.007
 Times Cited Count：29 Percentile：58.17(Geochemistry & Geophysics)

The density of the Apollo 14 black glass melt, which has the highest TiO$$_{2}$$ content of pristine mare glasses, was measured to 4.8 GPa and 2100 K using an X-ray absorption method. A fit of the pressure-density-temperature data to the high-temperature Birch-Murnaghan equation of state yielded the isothermal bulk modulus, its pressure derivative, and the temperature derivative of the bulk modulus. Implication for heterogeneities in the lunar mantle is discussed.

Journal Articles

Measurement of hydrous peridotite magma density at high pressure using the X-ray absorption method

Sakamaki, Tatsuya*; Otani, Eiji*; Urakawa, Satoru*; Suzuki, Akio*; Katayama, Yoshinori

Earth and Planetary Science Letters, 287(3-4), p.293 - 297, 2009/10

https://doi.org/10.1016/j.epsl.2009.07.030
 Times Cited Count：57 Percentile：78.64(Geochemistry & Geophysics)

The density of hydrous peridotite magma containing 5wt.% H$$_{2}$$O was measured at pressures and temperatures up to 4.3 GPa and 2073 K, respectively, using the X-ray absorption method. A fit of pressure-density-temperature data to the high-temperature Birch-Murnagan equation of state yields isothermal bulk modulus $$K_{T}=8.8pm 1.9$$ GPa, its pressure derivative $$K'=9.9pm 3.6$$ and the temperature derivative of the bulk modulus $$(delta K_{T}/delta T)_{P}=-0.0022 pm 0.0015$$ GPa/K at 1773K. The small bulk modulus of the hydrous peridotite magma compared with that of the dry peridotite magma reflects the effect of water, which is more compressible than the silicate melt.

Journal Articles

Anoxic dissolution processes of biotite; Implications for Fe behavior during Archean weathering

Murakami, Takashi*; Ito, Junichi*; Utsunomiya, Satoshi*; Kasama, Takeshi*; Kozai, Naofumi; Onuki, Toshihiko

Earth and Planetary Science Letters, 224(1-2), p.117 - 129, 2004/07

https://doi.org/10.1016/j.epsl.2004.04.040
 Times Cited Count：33 Percentile：53.32(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

The Effect of temperature, pressure, and sulfur content on viscosity of the Fe-FeS melt

Terasaki, Hidenori*; Kato, Takumi*; Urakawa, Satoru*; Funakoshi, Kenichi*; Suzuki, Akio*; Okada, Taku; Maeda, Makoto*; Sato, Jin*; Kubo, Tomoaki*; Kasai, Shizu*

Earth and Planetary Science Letters, 190(1-2), p.93 - 101, 2001/07

https://doi.org/10.1016/S0012-821X(01)00374-0
 Times Cited Count：52 Percentile：68.57(Geochemistry & Geophysics)

The Fe-FeS melt is thought to be the major candidate of the outer core material. Its viscosity is one of the most important physical properties to study the dynamics of the convection in the outer core. We performed the in situ viscosity measurement of the Fe-FeS melt under high pressure using X-ray radiography falling sphere method with a novel sample assembly. Viscosity was measures in the temperature, pressure, and compositional conditions of 1233-1923 K, 1.5-6.9 GPa, and Fe-Fe $$_{72}$$ S $$_{28}$$ (wt %), respectively. The viscosity coefficients obtained by 17 measurements change systematically in the range of 0.008-0.036 Pa s. An activation energy of the viscous flow, 30 kJ/mol, and the activation volume, 1.5 cm $$^{3}$$ /mol, are determined as the temperature and pressure dependence, and the viscosity of the Fe $$_{72}$$ S $$_{28}$$ melt is found to be smaller than that of the Fe melt by 15 %. These tendencies can be well correlated with the structural variation of the Fe-FeS melt.

Journal Articles

Trace Element Partition Between Two Pyroxenes and the Host Lava

; *; *; *

Earth and Planetary Science Letters, 5(1), p.47 - 51, 1968/09

no abstracts in English

Journal Articles

Uranium and thorium contents in ultrabasic rocks

; *; ; Kuno, H.*

Earth and Planetary Science Letters, 2(4), p.377 - 381, 1967/00

https://doi.org/10.1016/0012-821X(67)90160-4
 Times Cited Count：26

no abstracts in English

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