Abstract Paired records of δ13Ccarb and δ13Corg across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ13Corg during the initiation of the Ireviken Extinction Event (IEE) and prior to the onset of the Ireviken positive δ13Ccarb Excursion (ICIE). The record of carbon isotopic changes through this interval illustrate that both Δ13C (the difference between δ13Ccarb and δ13Corg) as well as the relative flux of organic carbon burial (forg) vary in unique ways and at different times during the progression of the IBE. Both process-oriented variables within the global carbon cycle (Δ13C and forg) track a series of events that help to demonstrate potential causative mechanisms of both the extinction and carbon cycle perturbation. The sequence of events demonstrated here largely mirror the cascade of events that took place during the Cretaceous Oceanic Anoxic Event 2 (OAE2) and a detailed comparison between the two events is provided here for the first time. The unique insight into the IBE presented in this work results primarily from the novel, nearly Neogene-scale resolution of the paired isotope data, which demonstrates the critical importance of high-resolution chemostratigraphic research to evaluating ancient perturbations to the Earth-life system. Additional data sets of equal or greater resolution through this interval will be critical to evaluate the global synchroneity of these short-lived events during the IBE, and similar high-resolution studies of other Paleozoic biogeochemical events may shed light on potentially similar causative mechanisms.

中文翻译：

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在 Ireviken 碳同位素偏移开始时解耦 δ13Ccarb 和 δ13Corg：志留纪海洋缺氧事件期间的 Δ13C 和有机碳埋藏（forg）

摘要 Llandovery-Wenlock 边界上 δ13Ccarb 和 δ13Corg 的成对记录显示了 Ireviken 生物地球化学事件 (IBE) 开始期间的异步行为。从瑞典哥特兰钻探的 Altajme 岩心产生的极高分辨率数据捕获了在 Ireviken 灭绝事件 (IEE) 开始期间和 Ireviken δ13Ccarb 正偏移 (ICIE) 开始之前 δ13Corg 的负偏移。通过该区间的碳同位素变化记录表明，Δ13C（δ13Ccarb 和 δ13Corg 之间的差异）以及有机碳埋藏的相对通量（forg）在 IBE 进展过程中以独特的方式和不同的时间变化。全球碳循环中的两个面向过程的变量（Δ13C 和 forg）跟踪一系列事件，这些事件有助于证明灭绝和碳循环扰动的潜在因果机制。这里展示的事件序列在很大程度上反映了白垩纪海洋缺氧事件 2 (OAE2) 期间发生的一系列事件，这里首次提供了这两个事件之间的详细比较。这项工作中提出的对 IBE 的独特见解主要来自配对同位素数据的新近新近纪尺度的新分辨率，这表明高分辨率化学地层研究对评估地球生命系统的古代扰动至关重要。