H
Hiroshi Nagasawa
Researcher at Gakushuin University
Publications - 36
Citations - 1889
Hiroshi Nagasawa is an academic researcher from Gakushuin University. The author has contributed to research in topics: Melilite & Allende meteorite. The author has an hindex of 19, co-authored 36 publications receiving 1833 citations. Previous affiliations of Hiroshi Nagasawa include Tokyo Institute of Technology.
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Trace element partition between two pyroxenes and the host lava
TL;DR: Partition coefficients for +1, +2, +3 and +4 valent trace ions between alkaline olivine basalt lava and the coexisting ortho- and clinopyroxene phenocrysts from Takashima, North Kyushu, Japan, have been determined by neutron activation analysis as mentioned in this paper.
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Crystal structure control in trace element partition between crystal and magma
TL;DR: The diagramme coefficient de partage-rayon ionique (PC-IR) as discussed by the authors is presente for the systemes tholeite a olivine, basalte alcalin, bronzite, augite, plagioclases, hornblende kaersutitique, and dacite a andesine and biotite.
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Partition of trace elements between rock-forming minerals and the host volcanic rocks
Hideo Higuchi,Hiroshi Nagasawa +1 more
TL;DR: Partition coefficients for +1 to +4 valent trace ions between ground mass of volcanic rocks and the coexisting phenocrysts of plagioclase, biotite, hornblende and olivine have been determined by neutron activation analysis as discussed by the authors.
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Oxygen isotope exchange between refractory inclusion in Allende and solar nebula gas.
TL;DR: The oxygen isotopic variation measured among the minerals (melilite, spinel, and fassaite) indicates that crystallization of the CAI started from oxygen-16-rich materials that were probably liquid droplets in the solar nebula, and oxygen isotope exchange with the surrounding oxygen- 16-poor nebular gas progressed through the crystallization.
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Trace Element Partition Coefficient in Ionic Crystals
TL;DR: The isotropic elastic model of ionic crystals was used for calculating the energy change caused by the ionic substitutions and the observed values of partition coefficients in KCl good agreement with calculate values.