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A lithium-isotope perspective on the evolution of carbon and silicon cycles

机译：锂 - 同位素透视碳和硅循环的进化

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摘要

The evolution of the global carbon and silicon cycles is thought to have contributed to the long-term stability of Earth's climate~(1-3). Many questions remain, however, regarding the feedback mechanisms at play, and there are limited quantitative constraints on the sources and sinks of these elements in Earth's surface environments~(4-12). Here we argue that the lithium-isotope record can be used to track the processes controlling the long-term carbon and silicon cycles. By analysing more than 600 shallow-water marine carbonate samples from more than 100 stratigraphic units, we construct a new carbonate-based lithium-isotope record spanning the past 3 billion years. The data suggest an increase in the carbonate lithium-isotope values over time, which we propose was driven by long-term changes in the lithium-isotopic conditions of sea water, rather than by changes in the sedimentary alterations of older samples. Using a mass-balance modelling approach, we propose that the observed trend in lithium-isotope values reflects a transition from Precambrian carbon and silicon cycles to those characteristic of the modern. We speculate that this transition was linked to a gradual shift to a biologically controlled marine silicon cycle and the evolutionary radiation of land plants~(13,14).
机译：认为全球碳和硅循环的演变是有助于地球气候的长期稳定性〜（1-3）。然而，许多问题仍然存在于游戏中的反馈机制，并且地球表面环境中这些元素的源和下沉存在有限的定量约束〜（4-12）。在这里，我们认为锂 - 同位素记录可用于跟踪控制长期碳和硅循环的过程。通过分析来自100多个地层单位的600多个浅水海洋碳酸盐样品，我们构建了跨越30亿多年来的新的碳酸盐基锂同位素记录。数据表明，随着时间的推移，我们提出的碳酸锂锂 - 同位素值增加，我们提出的海水锂 - 同位素条件的长期变化，而不是旧样品沉积改变的变化。使用大规模平衡建模方法，我们提出了锂 - 同位素值的观察到趋势反映了从普雷明碳和硅循环到现代的那些特征的过渡。我们推测，这种转变与逐渐转变为生物控制的海洋硅循环和土地植物的进化辐射〜（13,14）。

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  • 来源
    《Nature》 |2021年第7867期|394-398|共5页
  • 作者

    Boriana Kalderon-Asael; Joachim A R Katchinoff; Noah J Planavsky; Ashleigh V S Hood; Mathieu Dellinger; Eric J Bellefroid; David S Jones; Axel Hofmann; Frantz Ossa Ossa; Francis A Macdonald; Chunjiang Wang; Terry T Isson; Jack G Murphy; John A Higgins; A Joshua West; Malcolm W Wallace; Dan Asael; Philip A E Pogge von Strandmann;

  • 作者单位

    Earth and Planetary Sciences Yale University;

    Earth and Planetary Sciences Yale University;

    Earth and Planetary Sciences Yale University;

    The University of Melbourne School of Earth Sciences;

    Department of Geography Durham University;

    Earth and Planetary Sciences Yale University;

    Amherst College Geology Department;

    Department of Geology University of Johannesburg;

    Department of Geology University of Johannesburg|Department of Geosciences University of Tuebingen;

    Department of Earth Sciences University of California Santa Barbara;

    China University of Petroleum College of Geosciences;

    Earth and Planetary Sciences Yale University|Te Aka Mātuatua University of Waikato;

    Department of Geoscience Princeton University;

    Department of Geoscience Princeton University;

    Department of Earth Sciences University of Southern California;

    The University of Melbourne School of Earth Sciences;

    Earth and Planetary Sciences Yale University;

    London Geochemistry and Isotope Centre (LOGIC) Institute of Earth and Planetary Sciences University College London and Birkbeck University of London|Institute of Geosciences Johannes Gutenberg University;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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