Exploring petit-spot volcanoes

2011 Fiscal Year Final Research Report

• Project/Area Number: 22740350
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Tohoku University
• Principal Investigator: HIRANO Naoto 東北大学, 東北アジア研究センター, 助教 (00451831)
• Project Period (FY): 2010 – 2011
• Keywords: 地殻 / マントル化学 / 火山

Research Abstract

The widespread occurrence of petit-spot volcanoes could be indicated by the discovery of petit-spots at other sites. The research cruises were conducted at the area around the Marcus Island and off the Chile Trench oceanward slope in order to explore the submarine petit-spot volcanoes. Radiometric ages of obtained rock-samples are corresponding to the time on plate-flexure. Petit-spot volcanoes, therefore, could be formed ubiquitously wherever the plate flexes under the influence of plate tectonics.

Research Products

• [Journal Article] Petit-spot volcanism : a new type of volcanic zone discovered near a trench (2011)
  • Author(s): N. Hirano
  • Journal Title: Geochem. J. Volume: vol.45, no.2 Pages: 157-167
  • Peer Reviewed
• [Journal Article] Retentivity of CO_2 in fluid inclusions in mantle minerals (2011)
  • Author(s): J. Yamamoto, K. Otsuka, H. Ohfuji, H. Ishibashi, N. Hirano & H. Kagi
  • Journal Title: European J. Mineral. Volume: vol.23 Pages: 805-815
  • Peer Reviewed
• [Journal Article] New kind of volcano on the Earth-Geochronological studies of neutron-irradiated lavas erupted on the sea floor- (2011)
  • Author(s): N. Hirano
  • Journal Title: KINKEN Research Highlights Volume: vol.2011 Pages: 77
• [Journal Article] 海洋プレートの進化と海底火山を理解するためのAr-Ar年代測定 (2011)
  • Author(s): 平野直人
  • Journal Title: アイソトープ総合センターニュース Volume: vol.42(1) Pages: 10-16
• [Journal Article] Direct evidence for upper mantle structure in the NW Pacific Plate : microstructural analysis of a petit-spot peridotite xenolith (2011)
  • Author(s): Y. Harigane, T. Mizukami, T. Morishita, K. Michibayashi, N. Abe, N. Hirano
  • Journal Title: Earth Planet. Sci. Lett. Volume: vol.302 Pages: 194-202
  • Peer Reviewed
• [Journal Article] Role of plutonic and metamorphic block exhumation in a forearc ophiolite melange belt : An example from the Mineoka belt, Japan. (2011)
  • Author(s): R. Mori, Y. Ogawa, N. Hirano, T. Tsunogae, M. Kurosawa & T. Chiba
  • Journal Title: Melanges : Processes of Formation and Societal Significance, Geol. Soc. Volume: vol.480 Pages: 95-116
  • Peer Reviewed
• [Journal Article] プチスポット火山から期待される海洋リソスフェアの包括的理解と地質学の新展開-超モホール計画の提案- (2010)
  • Author(s): 平野直人・阿部なつ江・山本順司・町田嗣樹
  • Journal Title: 地質学雑誌 Volume: vol.116 Pages: 1-12
  • Peer Reviewed
• [Journal Article] Mechanisms of low-flux intraplate volcanic fields-Basin and Range (North America)and Northwest Pacific Ocean (2010)
  • Author(s): G. Valentine & N. Hirano
  • Journal Title: Geology Volume: v. 38 Pages: 55-58
  • DOI: DOI:10.1130/G30427.1
  • Peer Reviewed
• [Presentation] グリーンタフ時代の太平洋側火山活動とプチスポット (2011)
  • Author(s): 平野直人
  • Organizer: 日本地質学会第118年学術大会・日本鉱物科学会2011年年会合同学術大会(T14-O-8)
  • Place of Presentation: 茨城大学, 水戸
  • Year and Date: 2011-09-09
• [Presentation] 南鳥島の形成史、および周辺海域の海洋底調査 (2011)
  • Author(s): 平野直人
  • Organizer: 日本地球惑星科学連合2011年大会(SCG059-P10)
  • Place of Presentation: 幕張メッセ, 千葉
  • Year and Date: 2011-05-27
• [Presentation] MOR to ARC evolution and petit-spot volcanoes of the Mineoka ophiolite as revealed by new geochemical and age constraints (2011)
  • Author(s): N. Hirano
  • Organizer: Japanese-Russian workshop symposium, Northern Pacific-Rim Ophiolites and their Ocean-Floor Analogues
  • Place of Presentation: Tohoku University, Sendai, Japan
  • Year and Date: 2011-02-08
• [Presentation] The alkaline magma squeezed upward by the plate flexure prior to subduction off the Chile and Japan Trenches (2010)
  • Author(s): N. Hirano
  • Organizer: 2010 Fall Meeting, American Geophysical Union (V13F-07)
  • Place of Presentation: Moscow Center, San Francisco, USA
  • Year and Date: 2010-12-13
• [Presentation] プチスポット火山からの炭素放出量の見積もり (2010)
  • Author(s): 奥村聡・平野直人
  • Organizer: 2010年日本火山学会秋季大会(3-B12)
  • Place of Presentation: 京都大学, 京都
  • Year and Date: 2010-10-11
• [Presentation] 付加体へ取り込まれるプチスポット火山体 (2010)
  • Author(s): 平野直人
  • Organizer: 付加体へ取り込まれるプチスポット火山体
  • Place of Presentation: 島根大学, 松江
  • Year and Date: 2010-09-25
• [Presentation] チリ海溝とトンガ海溝沖のプチスポット火山 (2010)
  • Author(s): 平野直人
  • Organizer: 2010年度日本地球化学会年会(2C04)
  • Place of Presentation: 立正大学, 熊谷
  • Year and Date: 2010-09-08
• [Remarks] 平野直人, 火山はどこで発生するの? ～海底火山を掘って考える～, 東北大学附置研究所等一般公開「片平まつり2011」記念講演会, 一般講演, 2011年10月9日, 東北大学片平キャンパス, 生命科学プロジェクト総合研究棟, 仙台.
• [Remarks] (1)平野直人, 地震と火山はどこで起こるの?, 伊達市立月舘小学校, 依頼授業, 2010年12月1日, 伊達市立月舘小学校, 福島県.
• [Remarks] (2)平野助教, 火山、チリ沖にも東北大など発見, 2010年10月6日, 河北新報