Magma processes in the Moho Transition Zone: an insight from volcanoes off the fast-spreading ridges

2013 Fiscal Year Final Research Report

• Project/Area Number: 22403004
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Solid earth and planetary physics
• Research Institution: Kanazawa University
• Principal Investigator: UMINO SUSUMU 金沢大学, 自然システム学系, 教授 (30192511)
• Co-Investigator(Kenkyū-buntansha): MIYASHITA Sumio 新潟大学, 自然科学系, フェロー ; KISIMOTO Kiyoyuki 産業技術総合研究所, 地質情報研究部門, 研究員 (70356872) ; ISHIZUKA Osamu 産業技術総合研究所, 地質情報研究部門, 研究員 (90356444) ; GESHI Nobuo 産業技術総合研究所, 地質情報研究部門, 研究員 (70356955) ; KASAYA Takafumi 海洋研究開発機構, 地震津波海域観測研究開発センター, 主任技術研究員 (90373456)
• Co-Investigator(Renkei-kenkyūsha): KUMAGAI Hidenori 海洋研究開発機構, 海底資源研究開発センター, 主任技術研究員 (10344285) ; GOTO Tadanori 京都大学, 大学院工学系研究科, 准教授 (90303685)
• Project Period (FY): 2010-04-01 – 2014-03-31
• Keywords: オフリッジ火山 / 巨大海底溶岩流 / 深海掘削 / 1256深海掘削孔 / オマーンオフィオライト / 複合溶岩流 / 定置過程 / 内成的成長

Research Abstract

Off-ridge large lava flows in the Oman Ophiolite and in ODP site 1256 were investigated to understand the emplacement process and the magma genesis by analyzing the bulk-rock and mineral compositions and textures. Both lava flows were extruded at low extrusion rates as compound flow lobes, which were merged into thick large lobes. Merged flow lobes thicken endogenously as subsequent lava was injected into the molten core of the lobes. Magma compositions changed during the eruptions, resulted in mixing of magmas. Associated alkali basalts showing intermediated characteristics between ocean island basalts and enriched mid-ocean ridge basalts indicate that the sources for the large lava flows are shallower than ocean island basalt magmas.

Research Products

• [Journal Article] 海洋下部地殻への挑戦:1256D 掘削孔での成果(Exps 309/312/335) (2014)
  • Author(s): 宮下純夫・海野 進
  • Journal Title: 月刊地球号外 Volume: 64 Pages: 74-80
• [Journal Article] Origin of large wehrlitic intrusions found from Wadi Barghah to Salahi area in the northern Oman ophiolite (2014)
  • Author(s): Kaneko, K., Adachi, Y. and Miyashita, S.
  • Journal Title: Tectonic Evolution of the Oman Mountains (Geological Society, London, Special Publications) (In Rollinson, H.R., Searle, M.P., Abbasi, I.A., Al-Lazki, A. and Al Kindi, M.H. (eds.)) Volume: 392 Pages: 205-220
  • DOI: 10.1144/SP392.8.
• [Journal Article] Electrical characterization of the North Anatolian Fault Zone underneath the Marmara Sea, Turkey by ocean bottom magnetotellurics (2013)
  • Author(s): Kaya, T., Kasaya, T., Bulent Tank, S., Ogawa, Y., Kemal Tuncer, M., Oshima N., Honkura, Y. and Matsushima, M.
  • Journal Title: Geophysical Journal International Volume: 193, 2 Pages: 664-677
• [Journal Article] Lava accretion system around mid-ocean ridges: Volcanic stratigraphy in the Wadi Fizh area, northern Oman ophiolite (2012)
  • Author(s): Kusano, Y., Adachi, Y., Miyashita, S. and Umino, S.
  • Journal Title: Geochem. Geophys. Geosyst Volume: 13 Pages: Q05012
  • DOI: 10.1029/2011GC004006.
• [Journal Article] Emplacement mechanism of off-axis large submarine lava field from the Oman Ophiolite (2012)
  • Author(s): Umino, S.
  • Journal Title: J. Geophys. Res. Volume: 117 Pages: B11210
  • DOI: 10.1029/2012JB009198.
• [Journal Article] 合成開口ソナーを用いた海底熱水噴出域のマッピング, 2011 (2011)
  • Author(s): 澤 隆雄・笠谷貴史・八木原寛
  • Journal Title: 物理探査 Volume: 64 Pages: 279-290
• [Journal Article] Lava deposition history in ODP Hole 1256D : Insights from log-based volcanostratigraphy (2010)
  • Author(s): Tominaga, M. and Umino, S.
  • Journal Title: Geochem. Geophys. Geosyst Volume: 11 Pages: Q05003
  • DOI: 10.1029/2009GC002933.
• [Presentation] Electromagnetic survey around the seafloor massive sulfide using autonomous underwater vehicle (2013)
  • Author(s): Goto, T., Kasaya, T., Iwamura, N., Mikada, H., Takekawa, J., Sayanagi, K.
  • Organizer: The 11th SEGJ International Symposium
  • Place of Presentation: Yokohama
  • Year and Date: 20130000
• [Presentation] Developing new magnetometer system for marine EM survey (2013)
  • Author(s): Kasaya, T., Ichihara. H., Goto, T.
  • Organizer: The 11th SEGJ International Symposium
  • Place of Presentation: Yokosuka
  • Year and Date: 20130000
• [Presentation] Magma system along fast-spreading ridges controlled by segmentation : Evidence from the northern Oman ophiolite (2013)
  • Author(s): Miyashita, S. and Adachi, Y.
  • Organizer: EGU General Assembly 2013
  • Place of Presentation: Vienna
  • Year and Date: 20130000
• [Presentation] The estimation of hydraulic conductivity structure by means of SP inversion to dipole pumping test data (2013)
  • Author(s): Ozaki, Y., Bradford, J.H., Mikada, H., Goto, T. and Takekawa, J.
  • Organizer: The 11th SEGJ International Symposium
  • Place of Presentation: Yokohama
  • Year and Date: 20130000
• [Presentation] Removability of galvanic distortion on 3-D MT inversion (2013)
  • Author(s): Tani, M., Mikada, H., Goto, T., Takekawa, J. and Siripunvaraporn, W.
  • Organizer: The 11th SEGJ International Symposium
  • Place of Presentation: Yokohama
  • Year and Date: 20130000
• [Presentation] Emplacement processes of off-axis large submarine lava field in the Oman Ophiolite (2013)
  • Author(s): Umino, S., Kusano, Y., Kanayama, K. and Kitamura, K.
  • Organizer: IAVCEI 2013 Scientific Assembly
  • Place of Presentation: Kagoshima, Japan, 3H-P5
  • Year and Date: 20130000
• [Presentation] Insight Into the Thermal Structure of the Upper Oceanic Crust Using Crystal-size Geothermometer―Method (2012)
  • Author(s): Umino, S. and Okugawa, A.
  • Organizer: AOGS - AGU (WPGM) Joint Assembly 2012
  • Place of Presentation: (SE87-A008)
  • Year and Date: 20120000
  • Invited
• [Presentation] Emplacement mechanism of submarine large sheet flows from the Oman Ophiolite (2011)
  • Author(s): Umino, S.
  • Organizer: Abstracts of XXV IUGG General Assembly
  • Place of Presentation: Melbourne (IAVCEI - V07, #4636)
  • Year and Date: 20110000
• [Remarks]
  • URL: http://earth.s.kanazawa-u.ac.jp/~umino/GiantLavaFlow/GiantLava.html