Japan Geoscience Union Meeting 2023

Presentation information

Print

[J] Online Poster

H (Human Geosciences ) » H-RE Resource and Engineering Geology

[H-RE11] Earth Resource Science

Tue. May 23, 2023 1:45 PM - 3:15 PM Online Poster Zoom Room (1) (Online Poster)

convener:Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Kenzo Sanematsu(Mineral Resource Research Group, Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Ryohei Takahashi(Graduate School of International Resource Sciences, Akita University), Tatsuo Nozaki(Submarine Resources Research Center, Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology)

On-site poster schedule(2023/5/22 17:15-18:45)

1:45 PM - 3:15 PM

[HRE11-P07] Enrichment of rare earth elements in carbonaceous clays at the Nishigoya deposit of Tochigi Prefecture

*Kenzo Sanematsu1, Yoshiaki Kon1, Mihoko Hishino1, Koji Takahashi1 (1.Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

Keywords:Rare earth elements, Carbonaceous, Sericite, pyrophyllite, clays, Nishigoya deposit

The Nishigoya deposit located at northwest of Ibaraki Prefecture consists of sericitic pyrophyllite ores formed by hydrothermal alteration of the Neogene volcanic rocks. In this study, we found that rare earth elements (REE) are partially enriched in carbonaceous clays in veins and lenses. Since carbonaceous matters are depleted in REE, they were selectively concentrated during hydrothemal alteration. We disucuss the occurence of REE minerals and fractionation of REE during the hydrothemal alteration.