先カンブリア時代の大気酸素濃度の変遷  [in Japanese] Atmospheric oxygen evolution in the Precambrian  [in Japanese]

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Author(s)

    • 村上 隆 Murakami Takashi
    • 東京大学大学院理学系研究科地球惑星科学専攻 Department of Earth and Planetary Science, The University of Tokyo

Abstract

<p>Atmospheric oxygen evolution has long been discussed, especially with its relevance to the origin and evolution of life and the planet. Presence/absence of detrital redox-sensitive minerals, iron formations and red beds, behaviors of redox-sensitive elements in paleosols (ancient, subaerially-altered continental rocks) and ratios of carbon and sulfur stable isotopes in sedimentary rocks have been utilized to constrain atmospheric oxygen levels, which can dictate surface redox states, in the distant past, leading to a conventional view that the beginning (2.5–1.8 Ga) and ending (0.8–0.5 Ga) of the Proterozoic were two major periods when the oxygen level significantly increased in the Earth's history. More recent studies adopt multiple sulfur isotopes, iron speciation and trace elements (isotopes) as additional redox proxies. These proxies are not inconsistent with the conventional view, but the magnitude and timing of changes in these proxies are different between proxies and between geological records obtained from, e.g., iron formations, shales and paleosols. Also, the proxies suggest that there may have been transient oxygen increases of uncertain magnitude at 3.3–3.0 and 2.7–2.5 Ga. To better understand atmospheric oxygen evolution, process-based methods which quantify oxygen levels from individual proxies need to be developed to consistently and comprehensively explain multiple geochemical signatures.</p>

Journal

  • Chikyukagaku

    Chikyukagaku 51(2), 61-77, 2017

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    130007040283
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    028335909
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  J-STAGE 
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