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Revealing the process of melt generation and hidden reservoir formation in the Hadean Earth

Research Project

Project/Area Number 26400514
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionKyoto University

Principal Investigator

KOGISO Tetsu  京都大学, 人間・環境学研究科, 教授 (60359172)

Research Collaborator KONDO Nozomi  
YOSHINO Takashi  
MATSUKAGE Kyoko  
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords岩石鉱物鉱床学 / 地球惑星内部構造 / 初期地球 / 地球化学 / 高圧実験 / マグマ / 岩石・鉱物・鉱床学 / 地球・惑星内部構造
Outline of Final Research Achievements

The present Earth has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from chondrite, a complement low-142Nd/144Nd reservoir (hidden reservoir) is needed. We estimated the age and conditions to form the hidden reservoir based on Sm-Nd partitioning and melting phase relations. Our estimate indicates that the hidden reservoir should have formed within ~30 Myr from the Earth formation and at 7 GPa, 1750°C. We then performed high pressure melting experiments on primitive peridotite to determine the major element composition of a melt that can be the hidden reservoir at this condition, and calculated its density. The results indicate that the melt is iron- and titanium-rich komatiite. The estimated density of the melt is lower than that of the primitive peridotite, suggesting that the melt would have ascended in the mantle to form crust in the Hadean and have been ejected from the Earth by the giant impact.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (7 results)

All 2016 2015 2014

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Major element composition of an Early Enriched Reservoir: Constraints from 142Nd/144Nd isotope systematics in the early Earth and high pressure melting experiments of a primitive peridotite2016

    • Author(s)
      N. Kondo, T. Yoshino, K.N. Matsukage, and T. Kogiso
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 3 Issue: 1 Pages: 25-25

    • DOI

      10.1186/s40645-016-0099-0

    • NAID

      120005973347

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Major element composition of Early Enriched Reservoir: constraints from 146Sm-142Nd system and melting experiments of primitive peridotite2016

    • Author(s)
      Kondo, N., Yoshino, T., Matsukage, K. N., Kogiso, T.
    • Organizer
      35th International Geological Congress
    • Place of Presentation
      ケープタウン(南アフリカ共和国)
    • Year and Date
      2016-08-27
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Major element composition of the Early Enriched Reservoir: Constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of primitive peridotite2015

    • Author(s)
      N. Kondo, T. Yoshino, K. N. Matsukage, T. Kogiso
    • Organizer
      December 2015 Graduate Virtual Poster Showcase, American Geophysical Union
    • Place of Presentation
      AGU Showcase (online)
    • Year and Date
      2015-11-03
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Major element composition of the missing reservoir and the early Earth differentiation2015

    • Author(s)
      N. Kondo, T. Yoshino, K. N. Matsukage, K. Yoshida, T. Kogiso
    • Organizer
      25th Annual V.M. Goldschmidt Conference
    • Place of Presentation
      Prague, Czech Republic
    • Year and Date
      2015-08-18
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] 失われた貯蔵庫の主成分元素組成と初期地球の分化2015

    • Author(s)
      近藤望・芳野極 ・松影香子・吉田健太・小木曽哲
    • Organizer
      日本地球惑星科学連合2015年大会
    • Place of Presentation
      千葉市 幕張メッセ
    • Year and Date
      2015-05-25
    • Related Report
      2014 Research-status Report
  • [Presentation] 7GPaにおけるザクロ石カンラン岩ソリダスメルト組成と失われた貯蔵庫の主成分元素組成2014

    • Author(s)
      近藤望・芳野極・松影香子・吉田健太・小木曽哲
    • Organizer
      2014年度日本地球化学会第61回年会
    • Place of Presentation
      富山大学
    • Year and Date
      2014-09-17
    • Related Report
      2014 Research-status Report
  • [Presentation] Forming condition and major element composition of the hidden reservoir2014

    • Author(s)
      Kondo, N., Kogiso, T.
    • Organizer
      Goldschmidt Conference 2014
    • Place of Presentation
      Sacramento, USA
    • Year and Date
      2014-06-09
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2018-03-22  

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