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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Cyclostratigraphic calibration of the Famennian stage (Late Devonian, Illinois Basin, USA)
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Cyclostratigraphic calibration of the Famennian stage (Late Devonian, Illinois Basin, USA)

机译：Famennian舞台的Cyclosatraphic校准（美国晚德文尼亚，伊利诺伊州盆地，美国）

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The Late Devonian biosphere was affected by two of the most severe biodiversity crises in Earth's history, the Kellwasser and Hangenberg events near the Frasnian-Famennian (F-F) and the Devonian-Carboniferous (D-C) boundaries, respectively. Current hypotheses for the causes of the Late Devonian extinctions are focused on climate changes and associated ocean anoxia. Testing these hypotheses has been impeded by a lack of sufficient temporal resolution in paleobiological, tectonic and climate proxy records. While there have been recent advances in astronomical calibration that have improved the accuracy of the Frasnian time scale and part of the Famennian, the time duration of the entire Famennian Stage remains poorly constrained. During the Late Devonian, a complete Late Frasnian-Early Carboniferous succession of deep-shelf deposits accumulated in the epieric sea in Illinois Basin of the central North-American mid-continent. A record of this sequence is captured in three overlapping cores (H-30, Sullivan and H-32). The H-30 core section spans the F-F boundary; the Sullivan section spans almost all of the Famennian and the H-32 section sampled spans the interval of the Upper Famennian and the D-C boundary. To have the best chance of capturing Milankovitch cycles, 2000 rock samples were collected at minimum 5-cm-interval across the entire sequence. Magnetic susceptibility (MS) was measured on each sample and the preservation of climatic information into the MS signal was verified through geochemical analyses and low-temperature magnetic susceptibility acquisition. To estimate the duration of the Famennian Stage, we applied multiple spectral techniques and tuned the MS signal using the highly stable 405 kyr cycle for Sullivan and the obliquity cycle for the H-30 and H-32 cores. Based on the correlation between the cores we constructed a Famennian floating astronomical time scale, which indicates a duration of 13.5 +/- 0.5 myr. An uncertainty of 0.5 myr was estimated for
机译：已故德文郡生物圈受到地球历史，凯尔浪的历史上最严重的两个最严重的生物多样性危机的影响，分别附近的弗拉斯尼亚 - 弗罗斯 - 弗氏（F-F）和牧民 - 石炭系（D-C）界限。后期牧民灭绝的原因的当前假设集中在气候变化和相关的海洋缺氧。通过古生物，构造和气候代理记录中缺乏足够的时间分辨率来阻碍这些假设。虽然最近在天文校准方面提高了弗拉斯尼亚时间尺度和各个神仙的一部分的准确性，但整个名称阶段的时间持续时间仍然受到严格的影响。在晚德文郡，弗拉塞尔早期的弗拉塞尔 - 早期石炭系中，在中央北美洲伊利诺伊州伊利诺伊州伊利诺伊州南部的识别海洋中积累的深层沉积物。该序列的记录在三个重叠核（H-30，Sullivan和H-32）中捕获。 H-30核心部分跨越F-F边界; SULLIVAN部分几乎跨越了各种神灵，H-32部分采样跨越了上神仙和D-C边界的间隔。为了获得最佳机会捕获米兰科科循环，在整个序列中至少5厘米的岩石样品收集。通过地球化学分析和低温磁敏感采集验证了每个样品上测量磁敏感性（MS），并通过地球化学分析和低温磁性敏感性验证将气候信息的保存到MS信号中。为了估计神话期阶段的持续时间，我们应用多种光谱技术，并使用用于Sullivan的高度稳定的405 kyr循环和H-30和H-32芯的倾斜循环调谐MS信号。基于核心之间的相关性，我们构建了一个神仙的浮动天文时间尺度，表示持续时间为13.5 +/- 0.5 myr。估计0.5 MYR的不确定性

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