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Kalderon-Asael, Boriana; Katchinoff, Joachim A R; Planavsky, Noah J; Hood, Ashleigh V S; Dellinger, Mathieu; Bellefroid, Eric J; Jones, David S; Hofmann, Axel; Ossa, Frantz Ossa; Macdonald, Francis A; Wang, Chunjiang; Isson, Terry T; Murphy, Jack G; Higgins, John A; West, A Joshua; Wallace, Malcolm W; Asael, Dan; Pogge von Strandmann, Philip A E
Nature, 07/2021, Letnik: 595, Številka: 7867Journal Article
The evolution of the global carbon and silicon cycles is thought to have contributed to the long-term stability of Earth's climate . 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 . 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 .
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in: SICRIS
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