JpGU-AGU Joint Meeting 2020

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S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG55] Petrology, Mineralogy & Resource Geology

convener:Yu Nishihara(Geodynamics Research Center Ehime University), Koichi Momma(National Museum of Nature and Science), Tatsuo Nozaki(Submarine Resources Research Center, Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University)

[SCG55-P16] Synthesis of highly dense and fine-grained crustal and mantle mineral aggregates by spark plasma sintering (SPS) technique

*Sanae Koizumi1, Takehiko Hiraga1 (1.Earthquake Research Institute,The University of Tokyo)

Keywords:Sintering, Mantle mineral, Crustal mineral

We will present the synthesis of various types of the upper mantle and crustal mineral aggregates including mono-phase aggregates of Fe–free and Fe--bearing olivine, enstatite (MgSiO3) and anorthite (CaAl2Si2O8), two-phase composites of olivine + spinel, olivine + diopside (CaMgSiO6), olivine + enstatite and anorthite + diopside and three-phase composites of olivine + enstatite + diopside. We prepared mineral powders through solid state reaction of source powders at high temperature (Koizumi et al. 2010). They are densified by spark plasma sintering, which results in obtaining highly dense and fine-grained aggregates. In SPS, it is essential to use proper starting powders and sintering conditions such as temperature, duration time and heating rate. At low temperature of 1130 - 1250°C, short duration of 20 min and low heating rate of 10°C/min, we could obtain aggregates with grain size of 0.2 μm in minimum.