Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

S (Solid Earth Sciences ) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT21] Interaction and Coevolution of the Core and Mantle in the Earth and Planets

Mon. May 27, 2019 1:45 PM - 3:15 PM A10 (TOKYO BAY MAKUHARI HALL)

convener:Kenji Kawai(Department of Earth and Planetary Science, School of Science, University of Tokyo), Tsuyoshi Iizuka(University of Tokyo), Kenji Ohta(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Taku Tsuchiya(Geodynamics Research Center, Ehime University), Chairperson:Hitoshi Gomi, Tsuyoshi Iizuka

2:45 PM - 3:00 PM

[SIT21-17] Some technological developments in high temperature generation using KMA and precise melting/phase relations of minerals and rocks under deep mantle conditions

*Tetsuo Irifune1,2, Youmo Zhou1, Takeshi Arimoto1, Hideharu Kuwahara1, Ryuichi Nomura3, Masayuki Nishi1, Momoko Yamaguchi1, Yoshinori Tange4, Takahiro Kuribayashi5, Zhaodong Liu6 (1.Geodynamics Research Center, Ehime University, 2.Eearth Life Science Institute, Tokyo Institute of Technology, 3.Hakubi Center/ Graduate School of Human and Environmental Studies, Kyoto University, 4.Research & Utilization Division, Japan Synchrotron Research Institute, 5.Graduate School of Science, Tohoku University, 6.Institute of Super Hard Materials, Jilin University)

Keywords:lower mantle, multianvil apparatus, melting relations, phase relations, high pressure and high temperature experiment, technological development

Technological developments in stable and homogeneous high temperature generation have been made using conventional LaCrO3 or Re heater for Kawai-type multianvil apparatus (KMA) with tungusten carbide (WC) and sintered diamond (SD) anvils. For WC-KMA, stable temeperature generation to ~3000 K has been achieved under the pressures up to ~27 GPa mainly for quench experiments. Temperatures of ~2000-2300 K have been produced stably for 20-180 minutes at pressures to ~65 GPa for in situ X-ray measurements using SD-KMA, in addition to the ex situ experiments.

Some experimental studies for precise determination of subsolidus and melting phase relations have successfully been made for some simple mineral systems, such as MgSiO3-Al2O3, MgSiO3-FeSiO3, MgSiO3-CaSiO3, CaSiO3-SiO2, Al2O3-SiO2, KAlSi3O8-NaAlSi3O8, Al2SiO5, Ca3Al2Si3O12, etc. at temperatures near and above the typical geotherm at pressures corresponding to those of the mantle transition region to the middle part of the lower mantle. These studies have provided firm experimental databases for the mineralogy of the deep mantle, and also led to findings of some new high-pressure phases stable only under the very high-temperture conditions. Melting and associated partioning of some key trace elements in more complex chemical compositions have also been conducted under the pressures of the uppermost lower manlte to constrain the differentiation and evolution of the deep mantle.