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The lithosphere-asthenosphere boundary zone at steady state

Research Project

Project/Area Number 20H02003
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ozawa Kazuhito  東京大学, 大気海洋研究所, 特任研究員 (90160853)

Co-Investigator(Kenkyū-buntansha) 秋澤 紀克  東京大学, 大気海洋研究所, 助教 (40750013)
栗谷 豪  北海道大学, 理学研究院, 教授 (80397900)
柵山 徹也  大阪公立大学, 大学院理学研究科, 准教授 (80553081)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2022: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Keywordsリソスフェアーアセノスフェア境界 / ポテンシャル温度 / マントルかんらん岩 / マントルソリダス / 定常的リソスフェアーアセノスフェア境界 / マントルカンラン岩 / 定常的LAB / マントルポテンシャル温度
Outline of Research at the Start

地球の表面を覆うプレート(リソスフェア)とその直下のアセノスフェアの境界(LAB)は、地球内部からの熱放出と物質輸送を支配してきた領域である。地震波観測によって、現在の海洋下LABは、海嶺から遠ざかるにつれて深くなり、古い海洋プレートでは上限深度60-80kmに達することがわかってきた。LABの深度が上限に達するのは、古いプレートからの熱流量とアセノスフェアの対流による熱流束が釣り合い定常状態になっているためであると考えられる。本研究では、この定常的熱流束均衡が上部マントルの熱状態とマントル物質の溶融条件によって決まるという仮説をLAB領域物質から温度・圧力履歴の情報を読み取ることで検証する。

Outline of Final Research Achievements

Aiming at clarification of controlling factors that determine the depth of lithosphere-asthenosphere boundary (LAB), it is examined if the “steady LAB hypothesis,” which is established beneath old oceanic plates, is applicable to various non-oceanic tectonic settings. For this purpose, depths of LAB were determined by combining petrologic and geochemical data from mantle xenoliths and their host magmas. The former provides geothermal gradient of the lithosphere, and the latter provides potential temperature of the asthenosphere (Tp). Examined areas are back-arc of Tohoku, Japan, the Colorado Plateau and Rio Grande Rift in North America, and Middle Atlas, Morrocco. In these examined areas LABs are essentially dynamic involving transient processes affected by upwelling of asthenosphere. However, there are continent continental regions with a period when steady LAB was attained at the depth of 90-120km, which is governed by Tp and the asthenosphere composition including H2O and CO2.

Academic Significance and Societal Importance of the Research Achievements

固体地球の熱史は、海と陸地の違いを生み出すことなどを通して、現在の地球表層が生命に富んだ環境なった要因である。地球内部の熱状態の変動を知る事は、固体地球だけではなく地球の表層環境の長期的未来変動を理解する上で重要である。そのためには、地球内部から宇宙空間への熱放出の効率やその地域性および経年変化を理解し、地球表層を覆っているプレートの厚さがどのような機構で変動するのかを明らかにする必要がある。その機構は海洋地域や大陸地域などによって大きく異なるため、本研究では、プレートの厚さを決定するプレートの底を、できる限り多様なテクトニック場でプレートの底領域に由来する物質を用いてその実体を明らかにした。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (42 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (20 results) (of which Int'l Joint Research: 11 results,  Peer Reviewed: 19 results,  Open Access: 12 results) Presentation (15 results) (of which Int'l Joint Research: 4 results) Book (1 results)

  • [Int'l Joint Research] Cadi Ayad University(モロッコ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Assiut University(エジプト)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Assiut University(エジプト)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Cadi Ayyad University(モロッコ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Granada(スペイン)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] University of Montpellier(フランス)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Magma fractionation and emplacement mechanism in a subvolcanic plumbing system in a continental region: constraints from the late Neoproterozoic Wadi Dib ring complex in the Eastern Desert, Egypt2023

    • Author(s)
      Saad Eman、Ozawa Kazuhito、Kuritani Takeshi、Khudeir Ali A.
    • Journal Title

      Journal of Mineralogical and Petrological Sciences

      Volume: 118 Issue: 1 Pages: n/a

    • DOI

      10.2465/jmps.220801

    • ISSN
      1345-6296, 1349-3825
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Geochemical constraints on the evolution of the magmatic system leading to catastrophic eruptions at Aira Caldera, Japan2023

    • Author(s)
      Kuritani Takeshi
    • Journal Title

      Lithos

      Volume: 450-451 Pages: 107208-107208

    • DOI

      10.1016/j.lithos.2023.107208

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Olivine Melt Inclusion Constraints on Some Intensive Properties of Subvolcanic Crystal Mushes and Their Evolution through Boundary Layer Fractionation in Northern Japan2022

    • Author(s)
      Brahm R、Zellmer G F、Kuritani T、Sakamoto N、Yurimoto H、Nakagawa M、Sato E
    • Journal Title

      Journal of Petrology

      Volume: 63 Issue: 3 Pages: 1-23

    • DOI

      10.1093/petrology/egac016

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Compositional Variation of Picrites in the Emeishan Large Igneous Province Modulated by Water in the Mantle Plume2022

    • Author(s)
      Liu J.、Xia Q. K.、Sun H.、Hanski E.、Kuritani T.、Gu X. Y.、Chen H.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 127 Issue: 1 Pages: 1-15

    • DOI

      10.1029/2021jb023584

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Water enrichment in the mid-ocean ridge by recycling of mantle wedge residue2022

    • Author(s)
      Liu Jia、Tao Chunhui、Zhou Jianping、Shimizu Kenji、Li Wei、Liang Jin、Liao Shili、Kuritani Takeshi、Deloule Etienne、Ushikubo Takayuki、Nakagawa Mitsuhiro、Yang Weifang、Zhang Guoyin、Liu Yunlong、Zhu Chuanwei、Sun Hao、Zhou Jingjun
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 584 Pages: 117455-117455

    • DOI

      10.1016/j.epsl.2022.117455

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A direct evidence for disturbance of whole sediment layer in the subducting Pacific plate by petit-spot magma?water/sediment interaction2022

    • Author(s)
      Akizawa Norikatsu、Hirano Naoto、Matsuzaki Kenji M.、Machida Shiki、Tamura Chiori、Kaneko Junji、Iwano Hideki、Danhara Tohru、Hirata Takafumi
    • Journal Title

      Marine Geology

      Volume: 444 Pages: 106712-106712

    • DOI

      10.1016/j.margeo.2021.106712

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Decoding pressure-temperature-deformation history of the mantle:2021

    • Author(s)
      Akizawa Norikatsu、Ozawa Kazuhito、Masako Yoshikawa
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 127 Issue: 5 Pages: 269-291

    • DOI

      10.5575/geosoc.2021.0005

    • NAID

      130008093511

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2021-05-15
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion2021

    • Author(s)
      Akizawa, N., Ohara, Y., Okino, K., Ishizuka, O., Yamashita, H., Machida, S., Sanflippo, A., Basch, V., Snow, J.E., Sen, A., Hirauchi, K., Michibayashi, K., Harigane, Y., Fujii, M., Asanuma, H., Hirata, T.
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 8 Issue: 1 Pages: 65-65

    • DOI

      10.1186/s40645-021-00454-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Highly refractory dunite formation at Gibbs Island and Bruce Bank, and its role in the evolution of the circum-Antarctic continent.2021

    • Author(s)
      Akizawa, K., Ishikawa, A., Fujita, R., Choi., S.H.
    • Journal Title

      The Canadian Mineralogist

      Volume: 59 Issue: 6 Pages: 1731-1753

    • DOI

      10.3749/canmin.2100030

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Conditions of magma generation at the Me-akan volcano, northern Japan2021

    • Author(s)
      Kuritani Takeshi、Sato Eiichi、Wada Keiji、Matsumoto Akiko、Nakagawa Mitsuhiro、Zhao Dapeng、Shimizu Kenji、Ushikubo Takayuki
    • Journal Title

      Journal of Volcanology and Geothermal Research

      Volume: 417 Pages: 107323-107323

    • DOI

      10.1016/j.jvolgeores.2021.107323

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Tracing the subducting Pacific slab to the mantle transition zone with hydrogen isotopes2021

    • Author(s)
      Kuritani Takeshi、Shimizu Kenji、Ushikubo Takayuki、Xia Qun-Ke、Liu Jia、Nakagawa Mitsuhiro、Taniuchi Hajime、Sato Eiichi、Doi Nobuo
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 18755-18755

    • DOI

      10.1038/s41598-021-98307-y

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mush, Melts and Metasediments: a History of Rhyolites from the Okataina Volcanic Centre, New Zealand, as Captured in Plagioclase2021

    • Author(s)
      Sas May、Shane Phil、Kuritani Takeshi、Zellmer Georg F、Kent Adam J R、Nakagawa Mitsuhiro
    • Journal Title

      Journal of Petrology

      Volume: 62 Issue: 8 Pages: 1-26

    • DOI

      10.1093/petrology/egab038

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Na/K diversity of primary basaltic magmas induced by the separation of slab-derived supercritical liquid: Implications from alkali basaltic lavas from Rishiri Volcano, southern Kuril Arc2021

    • Author(s)
      Taniuchi Hajime、Kuritani Takeshi、Nakagawa Mitsuhiro
    • Journal Title

      Journal of Petrology

      Volume: 62 Issue: 12 Pages: 1-22

    • DOI

      10.1093/petrology/egab099

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal and decompression history of the Lanzo Massif, northern Italy: Implications for the thermal structure near the lithosphere?asthenosphere boundary2020

    • Author(s)
      Aoki Tomo、Ozawa Kazuhito、Bodinier Jean-Louis、Boudier Fran?oise、Sato Yuto
    • Journal Title

      Lithos

      Volume: 372-373 Pages: 105661-105661

    • DOI

      10.1016/j.lithos.2020.105661

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Ductile‐to‐Brittle Transition Recorded in the Balmuccia Peridotite Body, Italy: Ambient Temperature for the Onset of Seismic Rupture in Mantle Rocks2020

    • Author(s)
      Ueda Tadamasa、Obata Masaaki、Ozawa Kazuhito、Shimizu Ichiko
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 125 Issue: 2 Pages: 1-27

    • DOI

      10.1029/2019jb017385

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal state of the upper mantle and the origin of the Cambrian-Ordovician ophiolite pulse: Constraints from ultramafic dikes of the Hayachine-Miyamori ophiolite2020

    • Author(s)
      Kimura Takafumi、Ozawa Kazuhito、Kuritani Takeshi、Iizuka Tsuyoshi、Nakagawa Mitsuhiro
    • Journal Title

      American Mineralogist

      Volume: 105 Issue: 12 Pages: 1778-1801

    • DOI

      10.2138/am-2020-7160

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] モホロビチッチ不連続面(Moho)とリソスフェア-アセノスフェア境界(LAB)の一致(MohoLAB):大陸地殻の進化を支配する重要な境界2020

    • Author(s)
      小澤一仁・佐藤侑人・木村皐史・田上創・Hassan Eman Saad Abdelsalam
    • Journal Title

      新地球

      Volume: 1 Pages: 3-13

    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Journal Article] Magma plumbing system for the Millennium Eruption at Changbaishan volcano, China: Constraints from whole-rock U?Th disequilibrium2020

    • Author(s)
      Kuritani Takeshi、Nakagawa Mitsuhiro、Nishimoto Jumpei、Yokoyama Tetsuya、Miyamoto Tsuyoshi
    • Journal Title

      Lithos

      Volume: 366-367 Pages: 105564-105564

    • DOI

      10.1016/j.lithos.2020.105564

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Generation of calc-alkaline andesite magma through crustal melting induced by emplacement of mantle-derived water-rich primary magma: Evidence from Rishiri Volcano, southern Kuril Arc2020

    • Author(s)
      Taniuchi Hajime、Kuritani Takeshi、Nakagawa Mitsuhiro
    • Journal Title

      Lithos

      Volume: 354-355 Pages: 105362-105362

    • DOI

      10.1016/j.lithos.2019.105362

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A new concept for the genesis of felsic magma: the separation of slab-derived supercritical liquid2020

    • Author(s)
      Taniuchi Hajime、Kuritani Takeshi、Yokoyama Tetsuya、Nakamura Eizo、Nakagawa Mitsuhiro
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s41598-020-65641-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Estimation of melting conditions and potential temperature for highly alkaline fractionated trachybasalts: Wadi Dib ring complex in the Nubian Shield, Eastern Desert of Egypt2023

    • Author(s)
      Saad, E., Ozawa, K., Kuritani, T., and Khudeir, A. A.
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Deformation coupled with thermal event in the lithosphere-asthenosphere boundary zone: microstructural evidence from crystal Interface migration in peridotite xenoliths2023

    • Author(s)
      Ozawa, K., Sato, Y., Youbi, N., and Boumehdi, M. A.
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 桜島の完新世噴出物のSr-Nd-Pb同位体比分析に基づくマグマ系の進化についての検討2023

    • Author(s)
      栗谷豪・中川光弘・松本亜希子
    • Organizer
      日本火山学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Geochemical stratigraphy of oceanic lithosphere reconstructed by spinel/garnet peridotite xenoliths from petit-spots in the northwestern Pacific2023

    • Author(s)
      Akizawa, N., Ishikawa, A., Niwa, Y., Alard, O., Greau, Y., Hirano, N., Machida, S.
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith, Aitutaki Island, Cook Islands2023

    • Author(s)
      秋澤 紀克, 小澤 一仁, 小木曽 哲, 石川 晃, ウォリス サイモン, 川本 竜彦, 田村 明弘, 森下 知晃
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Geochemistry of Melt Inclusion in Scoria, Jeju Island, South Korea2023

    • Author(s)
      Kang M., Sakuyama T., Shimizu K., Ushikubo T.
    • Organizer
      2023 Joint Fall Meeting of Korean Geological Societies
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spatial variation of lithosphere-asthenosphere interaction revealed from peridotites and gabbros in the Hidaka metamorphic belt2022

    • Author(s)
      小澤一仁・田上創
    • Organizer
      日本地球惑星科学連合2022年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fractionation of a shallow silicic magmas body through interaction of collapse of volcanic structure and roof boundary layer documented in the Wadi Dib ring complex, Eastern Desert of Egypt2022

    • Author(s)
      Saad, E., Ozawa, K., Kuritani, T., and Khudeir, A. A.
    • Organizer
      European Geoscience Union Annual Assembly
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coupling of fractionation and collapse of volcanic pile and roof boundary layer of a magma body documented in the Wadi Dib ring complex, Eastern Desert of Egypt2022

    • Author(s)
      Saad, E., Ozawa, K., Kuritani, T., and Khudeir, A. A.
    • Organizer
      日本地球惑星科学連合2022年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 斑晶メルト包有物の水素同位体比による沈み込む太平洋プレートの追跡2022

    • Author(s)
      栗谷豪・清水健二・牛久保孝行・Xia Qun-ke・Liu Jia・中川光弘・谷内元・佐藤鋭一・土井宣夫
    • Organizer
      日本地球惑星科学連合2022年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] New deformation proxy for alkaline felsic rocks: Na-K zoning of alkali feldspar in syenites from the Wadi Dib alkaline ring complex, Eastern Desert, Egypt2021

    • Author(s)
      *Kazuhito Ozawa, Eman Saad Hassan, Hideto Yoshida, Ali Abdel-Kader Khudeir
    • Organizer
      Japanese Geoscience Union
    • Related Report
      2021 Annual Research Report
  • [Presentation] 西南日本 ,第四紀横田アルカリ玄武岩マグマの成因2021

    • Author(s)
      桐敷和, 柵山徹也, 木村純一
    • Organizer
      日本地球惑星科学連合 2021年大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 中国東北部五大連池市周辺域の新生代アルカリ玄武岩から推定されるマントル揮発成分量2021

    • Author(s)
      林裕馬, 柵山徹也, 清水健二, 牛久保孝之, 羽生毅, 常青, 木村純一
    • Organizer
      日本火山学会 2021年度秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Plagioclase peridotite or olivine-plagioclase assemblage in orogenic peridotites: its implications on high-temperature decompression of the subcontinental lithosphere-asthenosphere boundary zone2020

    • Author(s)
      K. Ozawa, C. J. Garrido, K. Hidas, J-L. Bodinier, T. Aoki, F. Boudier
    • Organizer
      European Geoscience Union General Assemblynce
    • Related Report
      2020 Annual Research Report
  • [Presentation] Olivine-plagioclase assemblage in orogenic peridotites: Proxy for the extent of lithosphere thinning and asthenosphere shallowing2020

    • Author(s)
      K. Ozawa, C. J. Garrido, K. Hidas, J-L. Bodinier, T. Aoki, F. Boudier
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
  • [Book] 新地球2020

    • Author(s)
      秋澤 紀克 , 小澤 一仁編集
    • Total Pages
      67
    • Publisher
      マントル出版
    • ISBN
      9784908703843
    • Related Report
      2020 Annual Research Report

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

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