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Middlesex/punctata event in the Rhenish Basin (Padberg section, Sauerland, Germany) – Geochemical clues to the early-middle Frasnian perturbation of global carbon cycle
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.gloplacha.2020.103211
Agnieszka Pisarzowska , R. Thomas Becker , Z. Sarah Aboussalam , Marek Szczerba , Katarzyna Sobień , Barbara Kremer , Krzysztof Owocki , Grzegorz Racki

Abstract A positive carbon stable isotope excursion of about 3‰ is documented in the topmost lower Frasnian at Padberg, eastern Rhenish Massif, as a muted record of the worldwide early−middle Frasnian isotopic perturbation (punctata Event; up to 6–8‰ shift in both δ13Ccarb and δ13Corg elsewhere), comparable with the Appalachian δ13C curve. This German isotopic signature occurs in a 12 m thick calciturbidite succession and correlates well with the three-step chemostratigraphic pattern known from the Holy Cross Mountains, Poland. It is especially clear in the δ13Corg shifts, whilst δ13Ccarb (and elemental geochemical) proxies are partly biased by post-sedimentary alterations. The New York State, Polish, Nevada and Padberg conodont successions place the onset of the major positive δ13C excursion slightly beneath the early–middle Frasnian boundary, with Ancyrodella nodosa (previously Ad. gigas form 1) as the main conodont guide species, and coincident with the Middlesex transgression and spread of cold, nutrient-rich, poorly oxygenated water masses. In the light of geochemical proxies, enhanced primary production and oxygen deficiency occurred evidently in the Rhenish Basin during the punctata Event. Moderate Hg enrichments in the early Middlesex/punctata Event interval suggest a volcanic signature. However, conclusive data from other regions are required to differentiate between effects of the regionally well-known synsedimenary magmatism and of a possible global volcanic trigger for the biogeochemical perturbation.

中文翻译:

莱茵盆地的 Middlesex/punctata 事件(Padberg 部分,Sauerland,德国)——全球碳循环早期-中期弗拉斯阶扰动的地球化学线索

摘要 在莱茵地块东部 Padberg 的最顶层下弗拉斯阶中记录了约 3‰的正碳稳定同位素偏移,作为全球早中期弗拉斯阶同位素扰动的无声记录(punctata 事件;在δ13​​Ccarb 和 δ13Corg 其他地方),与阿巴拉契亚 δ13C 曲线相当。这种德国同位素特征出现在 12 m 厚的钙质浊积岩系列中,与波兰圣十字山脉已知的三步化学地层模式密切相关。在 δ13Corg 位移中尤其明显,而 δ13Ccarb(和元素地球化学)代理部分受沉积后变化的影响。纽约州、波兰、内华达和帕德伯格牙形石系列将主要的 δ13C 正偏移的开始置于稍低于早中弗拉斯尼亚边界的位置,Ancyrodella nodosa(以前称为 Ad. gigas 形式 1)作为主要的牙形石引导物种,与米德尔塞克斯海侵和寒冷、营养丰富、缺氧水团的传播相吻合。从地球化学指标来看,斑点事件期间莱茵盆地的初级生产力明显增强和缺氧。Middlesex/punctata 早期事件间隔中的中等汞富集表明存在火山特征。然而,需要来自其他地区的结论性数据来区分区域众所周知的同沉积岩浆作用的影响和生物地球化学扰动的可能全球火山触发的影响。含氧量不足的水团。从地球化学指标来看,斑点事件期间莱茵盆地的初级生产力明显增强和缺氧。Middlesex/punctata 早期事件间隔中的中等汞富集表明存在火山特征。然而,需要来自其他地区的结论性数据来区分区域众所周知的同沉积岩浆作用的影响和生物地球化学扰动的可能全球火山触发的影响。含氧量不足的水团。从地球化学指标来看,斑点事件期间莱茵盆地的初级生产力明显增强和缺氧。Middlesex/punctata 早期事件间隔中的中等汞富集表明存在火山特征。然而,需要来自其他地区的结论性数据来区分区域众所周知的同沉积岩浆作用的影响和生物地球化学扰动的可能全球火山触发的影响。
更新日期:2020-08-01
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