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首页> 外文期刊>Paleoceanography >Diverse patterns of ocean export productivity change across the Cretaceous-Paleogene boundary: New insights from biogenic barium
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Diverse patterns of ocean export productivity change across the Cretaceous-Paleogene boundary: New insights from biogenic barium

机译：白垩纪-古生界范围内海洋出口生产力的多种变化：生物成因钡的新见解

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One of the best-studied aspects of the K-Pg mass extinction is the decline and subsequent recovery of open ocean export productivity (e.g., the flux of organic matter from the surface to deep ocean). Some export proxies, including surface-to-deep water δ~(13)C gradients and carbonate sedimentation rates, indicate a global decline in export productivity triggered by the extinction. In contrast, benthic foraminiferal and other geochemical productivity proxies suggest spatially and temporally heterogeneous K-Pg boundary effects. Here we address these conflicting export productivity patterns using new and compiled measurements of biogenic barium. Unlike a previous synthesis, we find that the boundary effect on export productivity and the timing of recovery varied considerably between different oceanic sites. The northeast and southwest Atlantic, Southern Ocean, and Indian Ocean records saw export production plummet and remain depressed for 350 thousand to 2 million years. Biogenic barium and other proxies in the central Pacific and some upwelling or neritic Atlantic sites indicate the opposite, with proxies recording either no change or increased export production in the early Paleocene. Our results suggest that widespread declines in surface-to-deep ocean δ~(13)C do not record a global decrease in export productivity. Rather, independent proxies, including barium and other geochemical proxies, and benthic community structure, indicate that some regions were characterized by maintained or rapidly recovered organic flux from the surface ocean to the deep seafloor, while other regions had profound reductions in export productivity that persisted long into the Paleocene.
机译：关于K-Pg灭绝的研究最多的方面之一是开放海洋出口生产力的下降和随后的恢复（例如，有机物从表层到深海的通量）。一些出口代理，包括从地表到深水的δ〜（13）C梯度和碳酸盐沉淀速率，表明了灭绝引发的全球出口生产率下降。相比之下，底栖有孔虫和其他地球化学生产力的代理人建议时空异构的K-Pg边界效应。在这里，我们使用新的和经过汇编的生物成因钡测量方法来解决这些相互矛盾的出口生产力模式。与以前的综合报告不同，我们发现在不同的海洋站点之间，对出口生产率和恢复时间的边界影响差异很大。在东北和西南大西洋，南大洋和印度洋的记录中，出口产量骤降，并持续了35万至200万年。中部太平洋的生物成因钡和其他代理以及一些上升流或尖锐大西洋站点表明情况恰恰相反，在古新世早期，代理记录没有变化或出口生产增加。我们的结果表明，从表层到深层海洋δ〜（13）C的普遍下降并未记录到全球出口生产率的下降。相反，独立的代理（包括钡和其他地球化学代理）以及底栖生物群落结构表明，某些地区的特征是维持或迅速恢复了从表层海洋到深海底的有机通量，而其他地区的出口生产力却持续大幅下降，并持续存在长期进入古新世。

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