119 research outputs found
Differentiation in the Early Earth's Interior: Constraints from Isotope Geochemistry and High-Pressure Experiments
No full textWe conducted isotopic model calculations and high-pressure melting experiments in order to estimate the major element composition of the “missing reservoir”, which is a supposed component that should compensate the difference in ¹⁴²Nd/¹⁴⁴Nd ratio between the bulk silicate Earth and carbonaceous chondrite, from which the Earth is assumed to have formed. Our estimation demonstrated that the missing reservoir should have picritic to komatiitic composition, and that it was likely to have been lost from the Earth's surface by a giant impact event at the last stage of the Earth formation
Evaluation of Upper-Limb Feeding Performance Using the Fugl–Meyer Assessment
No full textAbstract
Date Presented 3/30/2017
The Fugl–Meyer Assessment cutoff values to identify “can use spoon” and “can use chopsticks” were 54/53 and 62/61 points, with sensitivity and specificity of 86.7% and 96.4% and 100.0% and 97.1%, respectively. These optimal cutoff scores may be able to identify upper-limb feeding performance.
Primary Author and Speaker: Toshimasa Sone
Contributing Authors: Kazuaki Iokawa, Keiichi Hasegawa, Tetsu Tsukada, Mariko Kaneda</jats:p
Trace element transport during dehydration processes in the subducted oceanic crust: 2. Origin of chemical and physical characteristics in arc magmatism
No full text
Differentiation in the Early Earth's Interior: Constraints from Isotope Geochemistry and High-Pressure Experiments
No full textExperimental study of clinopyroxenite partial melting and the origin of ultra-calcic melt inclusions
No full textGeomagnetic Anomaly Survey at the Divergent Plate Boundary in Afar Depression, Ethiopia
No full textIn order to expand our knowledge about magnetic structures under a sea-floor spreading center and the formation process of magnetic stripes, we now proceed an on-land geo-electromagentic research plan at the divergent plate boundary in Afar Depression, Ethiopia, where we can directly investigate into a sea-floor spreading center on land. We will introduce our plan and report the progress of geomagnetic and geological surveys we have performed
Petit-spot as definitive evidence for partial melting in the asthenosphere caused by CO2
No full text地球のアセノスフェアは二酸化炭素によって部分的に溶けている : プレートテクトニクスの根幹に関わる論争決着に大きな前進. 京都大学プレスリリース. 2017-02-03.The deep carbon cycle plays an important role on the chemical differentiation and physical properties of the Earth's mantle. Especially in the asthenosphere, seismic low-velocity and high electrical conductivity due to carbon dioxide (CO2)-induced partial melting are expected but not directly observed. Here we discuss the experimental results relevant to the genesis of primitive CO2-rich alkali magma forming petit-spot volcanoes at the deformation front of the outer rise of the northwestern Pacific plate. The results suggest that primitive melt last equilibrated with depleted peridotite at 1.8 - 2.1 GPa and 1, 280 - 1, 290 °C. Although the equilibration pressure corresponds to the pressure of the lower lithosphere, by considering an equilibration temperature higher than the solidus in the volatile - peridotite system along with the temperature of the lower lithosphere, we conclude that CO2-rich silicate melt is always produced in the asthenosphere. The melt subsequently ascends into and equilibrates with the lower lithosphere before eruption
Trace element transport during dehydration processes in the subducted oceanic crust: 1. Experiments and implications for the origin of ocean island basalts
No full text- …
