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Paleozoic carbon cycle dynamics: Insights from stable carbon isotopes in marine carbonates and C3 land plants
Earth-Science Reviews ( IF 12.1 ) Pub Date : 2021-09-25 , DOI: 10.1016/j.earscirev.2021.103813
Yixin Dong 1, 2 , Ying Cui 2 , Jiuyuan Wang 3 , Hongde Chen 1 , Feifei Zhang 4 , Yuyang Wu 2, 5 , Ziheng Li 5 , Peng Zhu 6 , Shijun Jiang 7
Affiliation  

C3 land plants dominated the Paleozoic landscape since the Devonian and played an essential role in enhancing continental chemical weathering. Vast amount of organic carbon isotope data exist from Paleozoic-aged sediments deposited in fluvial, lacustrine, and floodplain environments. These carbon isotope data are measured from well-preserved plant fossils, paleosols, coals, charcoals, and bulk organic matter within the sediments. They are often used for age correlations with contemporaneous marine sections as a stratigraphic correlation tool, and are interpreted as indicators of the global carbon cycle. Here, we review the stable carbon isotope records of C3 land plants (δ13Cplant) in various forms in Paleozoic sediments (mostly Devonian, Carboniferous, and Permian), as well as marine carbonate carbon isotopes (δ13Ccarb), and interpret them in the context of global carbon cycle. The increasing trend of δ13C in both marine carbonates and terrestrial organic matter suggests an increase in organic carbon burial in the form of coal or petroleum, which is controlled by sea level, nutrient availability, and innovation of life. This compilation allows for the reconstruction of a new high-resolution atmospheric pCO2 from 423 to 252 Ma. We noted that the pCO2 was ~2000 ppmv in the Devonian, then lowered to ~850 ppmv in the Carboniferous, and peaked at ~7600 ppmv during the Late Permian. This trend is broadly consistent with pCO2 reconstructed from other proxies, including pedogenic carbonate proxy, stomatal proxy, and phytane proxy, with the exception of the Late Devonian when our reconstructed pCO2 is significantly higher than the other proxy records. Proxy-based paleotemperature records suggest higher pCO2 in the Late Devonian is more consistent with the elevated paleotemperatures.



中文翻译:

古生代碳循环动力学:来自海洋碳酸盐和 C3 陆地植物中稳定碳同位素的见解

自泥盆纪以来,C 3陆生植物在古生代景观中占主导地位,并在增强大陆化学风化作用中发挥了重要作用。沉积在河流、湖泊和漫滩环境中的古生代沉积物中存在大量有机碳同位素数据。这些碳同位素数据是从保存完好的植物化石、古土壤、煤、木炭和沉积物中的大块有机物质中测量出来的。它们通常用于与同期海洋剖面的年龄相关作为地层相关工具,并被解释为全球碳循环的指标。在这里,我们回顾了 C 3陆地植物(δ 13 C植物) 在古生代沉积物(主要是泥盆纪、石炭纪和二叠纪)以及海相碳酸盐碳同位素(δ 13 C carb)中以各种形式存在,并在全球碳循环的背景下对其进行解释。海洋碳酸盐和陆地有机质中 δ 13 C的增加趋势表明以煤或石油形式存在的有机碳增加,这受海平面、养分可用性和生命创新的控制。该编译允许重建新的高分辨率大气p CO 2从 423 到 252 Ma。我们注意到p CO 2在泥盆纪为~2000 ppmv,然后在石炭纪降低到~850 ppmv,并在晚二叠世期间达到~7600 ppmv。这一趋势与从其他代理(包括成土碳酸盐代理、气孔代理和植烷代理)重建的p CO 2大体一致,但晚泥盆世除外,当时我们重建的p CO 2显着高于其他代理记录。基于代理的古温度记录表明晚泥盆世较高的p CO 2与升高的古温度更一致。

更新日期:2021-10-29
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