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首页> 美国卫生研究院文献>Scientific Reports >Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales
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Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales

机译：上泥盆世（Famennian）黑色页岩最南端的欧美首次造林的地球化学证据

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The global dispersal of forests and soils has been proposed as a cause for the Late Devonian mass extinctions of marine organisms, but detailed spatiotemporal records of forests and soils at that time remain lacking. We present data from microscopic and geochemical analyses of the Upper Devonian Chattanooga Shale (Famennian Stage). Plant residues (microfossils, vitrinite and inertinite) and biomarkers derived from terrestrial plants and wildfire occur throughout the stratigraphic section, suggesting widespread forest in the southern Appalachian Basin, a region with no macro plant fossil record during the Famennian. Inorganic geochemical results, as shown by increasing values of SiO2/Al2O3, Ti/Al, Zr/Al, and the Chemical Index of Alteration (CIA) upon time sequence, suggest enhanced continental weathering that may be attributed to the invasion of barren lands by rooted land plants. Our geochemical data collectively provide the oldest evidence of the influences of land plants from the southernmost Appalachian Basin. Our synthesis of vascular plant fossil record shows a more rapid process of afforestation and pedogenesis across south-central Euramerica during the Frasnian and Famennian than previously documented. Together, these results lead us to propose a new hypothesis that global floral dispersal had progressed southward along the Acadian landmass rapidly during the Late Devonian.
机译：有人提议在森林和土壤中进行全球扩散是造成泥盆纪晚期海洋生物大规模灭绝的原因，但当时缺乏详细的森林和土壤时空记录。我们提出了上泥盆世查塔努加页岩（法门尼阶）的微观和地球化学分析数据。陆生植物和野火产生的植物残渣（微化石，镜质体和惰质体）和生物标记物遍布整个地层，表明阿巴拉契亚盆地南部森林广泛，该地区在法门尼时期没有大型植物化石记录。无机地球化学结果（如SiO2 / Al2O3，Ti / Al，Zr / Al值和化学变化指数（CIA）随时间顺序增加）表明，大陆风化增强可能归因于贫瘠土地的入侵。生根的陆地植物。我们的地球化学数据共同提供了最南端的阿巴拉契亚盆地土地植物影响的证据。我们合成的维管植物化石记录显示，在Frasnian和Famennian期间，横跨中南欧亚大陆的造林和成岩过程比以前记录的要快。综合起来，这些结果使我们提出了一个新的假说，即在晚泥盆纪期间，全球花卉传播已沿着阿卡迪亚大陆迅速向南发展。

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