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Identifications using Quartz Inclusions in Sand and Soil

Research Project

Project/Area Number 20K01153
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 04010:Geography-related
Research InstitutionJapan Coast Guard Academy Center for Maritime Safety and Security Studies

Principal Investigator

Noriko Kawamura  海上保安大学校(海上保安国際研究センター), 海上保安国際研究センター, 准教授 (80442458)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords法地質学 / 包有物 / 磁気測定 / 非破壊分析 / 石英 / 磁気分析 / 土砂 / 海砂
Outline of Research at the Start

「この土砂は,どこから来たのか」という問いは,地理学や地質学はもとより法科学分野において追及される課題である。石英は,土砂に普遍的に含まれている鉱物であり,近年,国内においてこの形態の特徴から,土砂の由来を推定する研究が実施されている(例えばItamiya et al., 2019)。また石英の包有物は,鉄やチタンの酸化物から成り,強い磁性を持つので,非破壊で迅速な磁気測定が可能である。本研究は,磁気測定で得られたデータから,土砂の由来を推定する手法を確立する。

Outline of Final Research Achievements

Sediment and soil samples are consisted of rock fragments and minerals, and are collected as the evidence in criminal investigations. We are asked “where the rock fragments and minerals come from?” in forensic science and geology. We focused to beach where illegal activities and transportations of sediment particles have been occurred. Itamiya et al. (2019) reported results of surface microtexture of quartz in the beach sediment samples at nine sites from Aomori Prefecture in Japan, and revealed the relationship between the quartz morphological features per sites. We focused on not only quartz, but also feldspar and magnetic minerals at the same sites. The beach sediments are affected under pH condition change, either seawater (alkaline) or rainfall (acidic), while the inclusions are less susceptible to the change. We analysed the inclusions, and revealed that inclusions in quartz, feldspar, and magnetic minerals can be magnetically identified.

Academic Significance and Societal Importance of the Research Achievements

研究開始当初は、石英の包有物のみに着目していたが、堆積物に普遍的に含まれる磁性鉱物長石の包有物についても磁気分析や元素分析を行ったところ、採取地点ごとの特徴を見出すことができた。石英に限らず、他の鉱物の包有物の特徴を組み合わせることにより、より詳細な堆積粒子の採取地点の推定に応用できる可能性がある。このことは、法科学分野での堆積粒子の由来推定だけでなく、環境学分野や地質学分野での粒子の移動経路についての研究において、大きな発展が見込める。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Changes in elements and magnetic properties of <scp>Sendai Bay</scp> sediments caused by the 2011 <scp>Tohoku‐oki</scp> tsunami2022

    • Author(s)
      Abe Hirokuni、Kawamura Noriko、Ishikawa Naoto、Kogiso Tetsu
    • Journal Title

      Island Arc

      Volume: 31 Issue: 1 Pages: 1-17

    • DOI

      10.1111/iar.12437

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Application of magnetic susceptibility for the identification of disturbed soil surfaces2022

    • Author(s)
      Kawamura Noriko、Ishikawa Naoto、Yamazaki Toshitsugu
    • Journal Title

      Japanese Journal of Forensic Science and Technology

      Volume: 27 Issue: 1 Pages: 93-105

    • DOI

      10.3408/jafst.819

    • NAID

      130008149261

    • ISSN
      1880-1323, 1881-4689
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic measurements as a forensic geology tool: A review2020

    • Author(s)
      Kawamura Noriko
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 126 Issue: 8 Pages: 459-470

    • DOI

      10.5575/geosoc.2020.0015

    • NAID

      130007940796

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2020-08-15
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Recent Studies of Magnetic Survey of Forensic Geology in Japan2023

    • Author(s)
      Noriko Kawamura, Tadahiro Hatakeyama, Yu Kitahara, and Shinobu Kaneko
    • Organizer
      New Horizons in Forensic Geoscience: The Bedrock of International Security in Minerals, Mining, Metals, Murders and the Missing. A forensic geology joint meeting between GSL-FGG and IUGS IFG.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 法地質学: 最近の国内研究のレビュー2023

    • Author(s)
      川村 紀子・杉田 律子
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Forensic research of beach sand collected from Aomori in Japan: an application of rock magnetic and chemical analyses2022

    • Author(s)
      Noriko Kawamura, Takuya Matsushita, Hiromi Itamiya, Ritsuko Sugita
    • Organizer
      JpGU 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] オーバーハウザー磁力計を用いた海岸での秘匿物の検出のための基礎的研究2021

    • Author(s)
      川村 紀子, 畠山 唯達,北原 優,森 伊吹,横田 大峻
    • Organizer
      日本法科学技術学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 表層土壌の攪乱場所特定のための初磁化率の適用2020

    • Author(s)
      川村 紀子・石川 尚人・山崎 俊嗣
    • Organizer
      日本法科学技術学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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