Updated on 2023/02/02

写真a

 
AZAMI, Keishiro
 
Scopus Paper Info  
Paper Count: 0  Citation Count: 0  h-index: 3

Citation count denotes the number of citations in papers published for a particular year.

Affiliation
Faculty of Science and Engineering, School of Creative Science and Engineering
Job title
Assistant Professor(non-tenure-track)

Education

  • 2018.04
    -
    2022.03

    The University of Tokyo   The Graduate School of Engineering   Department of System Innovation  

  • 2016.04
    -
    2018.03

    Tohoku University   Graduate School of Science   Department of Earth Science  

  • 2014.04
    -
    2016.03

    Tohoku University   Faculty of Science   Division of Earth and Planetary Materials Sciences  

Degree

  • 2022.03   The University of Tokyo   Ph.D. (Engineering)

  • 2018.03   Tohoku University   Master of Science

  • 2016.03   Tohoku University   Bachelor of Science

Research Experience

  • 2022.04
    -
    Now

    Waseda University   Department of Resources and Environmental Engineering, School of Creative Science and Engineering

Professional Memberships

  • 2022.04
    -
    Now

    The Geochemical Society of Japan

  • 2018.04
    -
    Now

    日本地質学会

  • 2016.04
    -
    Now

    Japan Geoscience Union

 

Research Areas

  • Solid earth sciences   Geochemistry

Research Interests

  • Ferromanganese crust

Papers

  • Geochemistry of ferromanganese nodules in the soil of Okinawa Island, Japan: Paleoclimatic implications and discrimination scheme of the nodule origins

    Keishiro Azami, Kazutaka Yasukawa, Yasuhiro Kato

    Journal of Asian Earth Sciences: X   8   100127 - 100127  2022.12

    DOI

    Scopus

  • 87Sr/86Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean

    Keishiro Azami, Naoto Hirano, Jun-Ichi Kimura, Qing Chang, Hirochika Sumino, Shiki Machida, Kazutaka Yasukawa, Yasuhiro Kato

    Minerals    2022.07

    DOI

    Scopus

  • Stratigraphic Variations of Fe–Mn Micronodules and Implications for the Formation of Extremely REY-Rich Mud in the Western North Pacific Ocean

    Kazutaka Yasukawa, Satoshi Kino, Junichiro Ohta, Keishiro Azami, Erika Tanaka, Kazuhide Mimura, Koichiro Fujinaga, Kentaro Nakamura, Yasuhiro Kato

    Minerals   11 ( 3 ) 270 - 270  2021.03

    　View Summary

    <jats:p>The origin of deep-sea sediments in the western North Pacific Ocean, which are significantly enriched in rare-earth elements and yttrium (REY), and its paleoceanographic implications have been poorly constrained. Here, we investigated stratigraphic variations in the chemical compositions and textures of ferromanganese (Fe–Mn) micronodules separated from western North Pacific sediments. The characteristics of the micronodules of an extremely REY-rich mud layer vary from almost purely diagenetic to relatively hydrogenetic. This indicates the abundant supply of organic matter to the sediment together with fish debris that accumulates REY at the onset of the REY-enrichment of the mud, followed by the exposure of the seafloor to oxic water masses during the latter half of the formation of the REY-rich mud. These results support a previously proposed formation mechanism based on which enhanced bottom water currents caused pelagic fish proliferation via the upwelling of nutrients and fish debris was physically sorted and selectively accumulated on the seafloor. After the main REY-enrichment, the micronodules exhibit varying diagenetic signatures, suggesting changes in the bottom current intensities after the main REY-enrichment. However, the bulk REY contents do not increase. This implies that a sufficient increase in the fish productivity is an essential factor affecting the formation of REY-rich mud.</jats:p>

    DOI

    Scopus

    6
    Citation
    (Scopus)

  • Geochemical features of Fe-Mn micronodules in deep-sea sediments of the western North Pacific Ocean: Potential for co-product metal extraction from REY-rich mud

    Kazutaka Yasukawa, Satoshi Kino, Keishiro Azami, Erika Tanaka, Kazuhide Mimura, Junichiro Ohta, Koichiro Fujinaga, Kentaro Nakamura, Yasuhiro Kato

    Ore Geology Reviews   127   103805 - 103805  2020.12

    DOI

    Scopus

    16
    Citation
    (Scopus)

  • Rare earth elements and yttrium (REY) variability with water depth in hydrogenetic ferromanganese crusts

    K. Azami, N. Hirano, S. Machida, K. Yasukawa, Y. Kato

    Chemical Geology   493   224 - 233  2018.08

    DOI

    Scopus

    18
    Citation
    (Scopus)

Awards

  • 若手奨励賞

    2019.03   ブルーアースサイエンス・テク2019  

  • 若手奨励賞

    2017.03   ブルーアースサイエンス・テク2017  

  • Silver medal

    2011.09   International Earth Science Olympiad  

  • Grand prize

    2011.06   Japan Earth Science Olympiad Committee  

Research Projects

  • Establishment of ferromanganese crust stratigraphy: from environment change to plate motion

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Project Year :

    2018.04
    -
    2021.09
     

Presentations

  • プチスポット火山による海洋地殻に対する熱水変質の影響

    浅見慶志朗, 町田嗣樹, 平野直人, 小木曽哲, 中村謙太郎, 加藤泰浩

    日本地球化学会 第69回年会 

    Presentation date： 2022.09

    Event date：
    2022.09
    　
    　

  • 独立成分分析に基づく低温熱水活動の推移

    浅見慶志朗, 町田嗣樹, 平野直人, 中村謙太郎, 安川和孝, 小木曽哲, 加藤泰浩

    日本地質学会 第129年学術大会 

    Presentation date： 2022.09

    Event date：
    2022.09
    　
    　

  • Geochemical features of Fe-Mn micronodules in deep-sea sediments around Minamitorishima Island: Potential for co-product metal extraction from REY-rich mud

    Yasukawa Kazutaka, Kino Satoshi, Azami Keishiro, Tanaka Erika, Mimura Kazuhide, Ohta Junichiro, Fujinaga Koichiro, Nakamura Kentaro, Kato Yasuhiro

    Presentation date： 2021.09

  • High-resolution dating of ferromanganese nodules around Minamitorishima Island based on osmium isotopic ratio

    Aoyagi Sota, Ohta Junichiro, Azami Keishiro, Nakamura Kentaro, Yasukawa Kazutaka, Nozaki Tatsuo, Machida Shiki, Kimura Jun-ichi, Kato Yasuhiro

    Presentation date： 2021.09

  • Geochemical features of Fe-Mn micronodules in deep-sea sediments around Minamitorishima Island: Implications for the formation process of extremely REY-rich mud

    Yasukawa Kazutaka, Kino Satoshi, Ohta Junichiro, Azami Keishiro, Tanaka Erika, Mimura Kazuhide, Fujinaga Koichiro, Nakamura Kentaro, Kato Yasuhiro

    Presentation date： 2021.09

  • Chemostratigraphy of ferromanganese crusts based on Independent Component Analysis

    Azami, K, Chang, Q, Kimura, J-I, Yasukawa, K, Nakamura, K, Kato, Y

    JpGU 2020 

    Presentation date： 2020.07

  • 鉄マンガンクラストの微細化学層序

    浅見慶志朗, 常青, 木村純一, 安川和孝, 中村謙太郎, 加藤泰浩

    日本地質学会第126年学術大会 

    Presentation date： 2019.09

  • High-resolution chemostratigraphy of Fe-Mn crusts

    Azami, K, Chang, Q, Kimura, J-I, Yasukawa, K, Nakamura, K, Kato, Y

    Goldschmidt 

    Presentation date： 2019.08

  • The first report of the evidence for hydrothermal activity in old oceanic plate

    Azami, K, Machida, S, Hirano, N, Kogiso, T, Kato, Y

    JpGU 2019 

    Presentation date： 2019.05

  • 鉄マンガンクラストのREE組成の水深依存性：海水中溶存REEの地球化学に対する示唆

    浅見慶志朗, 平野直人, 町田嗣樹, 安川和孝, 加藤泰浩

    日本地質学会第125年学術大会 

    Presentation date： 2018.12

  • Origin of Diagenetic Signal in Hydrogenetic Ferromanganese Crusts from Petit-spot Volcanoes

    Azami, K, Hirano, N, Takahashi, N, Watanabe, T

    AOGS (Asia Oceania Geoscience Society) 14th Annual Meeting 

    Presentation date： 2017.08

  • REE and Y Distribution in Deep Submarine Ferromanganese Crusts

    Azami, K, Hirano, N, Machida, S, Yasukawa, K, Kato, Y

    Goldschmidt 

    Presentation date： 2016.06

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Syllabus