Study on 1-byr time scale variation in the geomagnetic field using granitic rocks in Minnesota River valley

• Project/Area Number: 18540417
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: TSUNAKAWA Hideo Tokyo Institute of Technology, 大学院・理工学研究科, 教授 (40163852)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,940,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥540,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
• Keywords: 古地磁気 / 花崗岩 / 先カンブリア紀 / ミネソタ / 磁鉄鉱 / 残留磁化 / 貫入岩テスト / 岩石磁気

Research Abstract

先カンブリア紀ミネソタ花崗岩類を系統的に採取し、詳細な岩石磁気学的研究を行った結果、安定した残留磁化は長石や石英に含まれる単磁区磁鉄鉱であった。これらは初生磁化を保持しうるので、古地磁気強度測定試料として有用性が示唆される。

Research Products

• [Journal Article] 白亜紀スーパークロンと温室地球-関連性の示唆と古地磁気強度- (2008)
  • Author(s): 吉原 新、渋谷秀敏、綱川秀夫、松島政貴
  • Journal Title: 月刊地球 30 Pages: 378-386
• [Journal Article] 地球ダイナミクスが生み出す地磁気 (2008)
  • Author(s): 綱川秀夫、望月伸竜、高橋太
  • Journal Title: 日本磁気学会会報 3 Pages: 298-305
  • NAID: 10021155299
• [Journal Article] 白亜紀スーパークロンと温室地球一関連性の示唆と古地磁気強度- (2008)
  • Author(s): 吉原新, 渋谷秀敏, 綱川秀夫, 松島政貴
  • Journal Title: 月刊地球 30 Pages: 378-386
• [Journal Article] 地球ダイナミクスが生み出す地磁気 (2008)
  • Author(s): 綱川秀夫, 望月伸竜, 高橋太
  • Journal Title: 日本磁気学会会報 3 Pages: 298-305
  • NAID: 10021155299
• [Journal Article] Further K-Ar dating and paleomagnetic study of the Auckland geomagnetic excursions (2007)
  • Author(s): Mochizuki, N., et. al.
  • Journal Title: Earth Planets Space, 59 59 Pages: 755-761
  • Peer Reviewed
• [Journal Article] Paleomagnetism of the Datong monogenetic volcanoes in China: paleodirection and paleointensity during the middle to early Brunhes Chron (2007)
  • Author(s): Yamamoto, Y., et. al.
  • Journal Title: Earth Planets Space 59 Pages: 727-746
  • Peer Reviewed
• [Journal Article] New K-Ar ages of the Society Islands in French Polynesia and implication for the Society hotspot feature (2007)
  • Author(s): Uto, K., et. al.
  • Journal Title: Earth Planets Space 59 Pages: 879-885
  • Peer Reviewed
• [Journal Article] Paleomagnetism of the middle Cretaceous Iritono granite in the Abukuma region, northeast Japan (2006)
  • Author(s): Wakabayashi, K., Tsunakawa, H., Mochizuki, N., Yamamoto Y., Takigami, Y.
  • Journal Title: Tectonophys 421 Pages: 161-171
• [Presentation] Magnetic properties of the Precambrian granitic rocks in Minnesota (2008)
  • Author(s): N. Mochizuki, T. Kogiso, M. Sato, K.Seita, H. Tsunakawa
  • Organizer: American Gephysical Union
  • Place of Presentation: San Francisco
  • Year and Date: 2008-12-17
• [Presentation] 先カンブリア紀玄武岩質岩脈の初生磁化の検出 (2008)
  • Author(s): 清田和宏、望月伸竜、佐藤雅彦、小木曽哲、高橋太、綱川秀夫
  • Organizer: 地球電磁気・地球惑星圏学会秋季講演会
  • Place of Presentation: 仙台市戦災復興会館
  • Year and Date: 2008-10-20
• [Presentation] 先カンブリア時代ミネソタ花崗岩類の磁気特性 (2008)
  • Author(s): 望月伸竜、小木曽哲、佐藤雅彦、清田和宏、綱川秀夫
  • Organizer: 地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張市幕張メッセ
  • Year and Date: 2008-05-27
• [Presentation] 先カンブリア時代ミネソタ花岡岩類の磁気特性 (2008)
  • Author(s): 望月伸竜, 小木曽哲, 佐藤雅彦, 清田和宏, 綱川秀夫
  • Organizer: 地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張市幕張メッセ
  • Year and Date: 2008-05-27