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首页> 外文期刊>Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften: ZDGG >Petrified trees of the Kyffh?user (Pennsylvanian, Thuringia): Growth habitat, fossilisation and palaeoclimatic-palaeoecological implications
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Petrified trees of the Kyffh?user (Pennsylvanian, Thuringia): Growth habitat, fossilisation and palaeoclimatic-palaeoecological implications

机译：kyffh的石化树？用户（宾夕法尼亚州，图林根州）：生长栖息地，渗透和古生物 - 古生物的影响

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摘要

Petrified woods from the Kyffh?user (Siebigerode Fm., Saale Basin) are among Germany's most voluminous occurrences of petrified trees.We reconstruct the provenance and fossilisation of the silicified logs and accompanying fossil plants based on sediment architectures documented in 15 quarries, plant-anatomical analyses of 112 specimens from eight collections and cathodoluminescence microscopy of silicified tissues.The up to 20 m long Agathoxylon trunks derived from 40 m tall cordaitaleans and conifers.Alluvial processes, the erosion of adjacent basement slopes during floods and storms were the main forces to recruit large woody debris from seasonally dry forests growing in extrabasinal habitats.A climatically controlled high discharge variability and the large-scaled, low-sinuous channel geometry ensured transport of the trunks across a 60 km distance towards the basin centre.Deposition of the logs occurred during the waning flood stage accompanied by the formation of four large woody debris-induced sedimentary structures.The stratigraphic occurrence of silicified trunks indicates a hydrodynamic window of log entombment constrained by river morphology, discharge regime, wood shape, and wood density.The synsedimentary to early postsedimentary silicification was a millennium-scale twophase process and resulted in selective tissue preservation referred to as “pointstone”.Imprints from associated floodplain deposits reveal sparse riparian vegetation consisting of ferns, calamitaleans, pteridosperms, and juvenile to shrub-like cordaitaleans.Results demonstrate the potential of multidisciplinary approaches in interpreting plant taphocoenoses and highlight the Kyffh?user as a crucial locality to elucidate late Palaeozoic vegetation dynamics.
机译：来自基夫的石化森林？user（萨勒盆地Siebigoreve Fm.）是德国数量最多的石化树木之一。我们根据15个采石场记录的沉积物结构、8个采集的112个标本的植物解剖分析以及硅化组织的阴极发光显微镜，重建了硅化原木和伴生化石植物的来源和化石。从40米高的科达塔勒树和针叶树中获得的长达20米的无根木树树干。冲积过程、洪水和风暴期间对相邻基底边坡的侵蚀是从生长在盆地外栖息地的季节性干燥森林中收集大量木屑的主要力量。受气候控制的高流量可变性和大范围、低弯曲的河道几何结构确保了树干在60 km距离内向盆地中心运输。原木的沉积发生在洪水消退阶段，伴随着四个大型木屑诱发的沉积构造的形成。硅化树干的地层产状表明，受河流形态、流量状况、木材形状和木材密度的限制，存在一个原木埋藏的水动力窗口。同沉积到沉积后早期的硅化作用是一个千年规模的两阶段过程，导致选择性的组织保存，称为“尖石”。来自相关漫滩沉积物的印记揭示了稀疏的河岸植被，包括蕨类植物、灾难蕨类植物、蕨类植物和幼年到灌木状的科达塔兰。结果证明了多学科方法在解释植物直感方面的潜力，并强调了Kyffh？用户是阐明晚古生代植被动态的关键地点。

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