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Spatial correlation bias in late-Cenozoic erosion histories derived from thermochronology

机译：热年代学在新生代晚期侵蚀历史中的空间相关偏差

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摘要

The potential link between erosion rates at the Earth's surface and changes in global climate has intrigued geoscientists for decades(1,2) because such a coupling has implications for the influence of silicate weathering(3,4) and organic-carbon burial(5) on climate and for the role of Quaternary glaciations in landscape evolution(1,6). A global increase in late-Cenozoic erosion rates in response to a cooling, more variable climate has been proposed on the basis of worldwide sedimentation rates(7). Other studies have indicated, however, that global erosion rates may have remained steady, suggesting that the reported increases in sediment-accumulation rates are due to preservation biases, depositional hiatuses and varying measurement intervals(8-10). More recently, a global compilation of thermochronology data has been used to infer a nearly twofold increase in the erosion rate in mountainous landscapes over late-Cenozoic times(6). It has been contended that this result is free of the biases that affect sedimentary records(11), although others have argued that it contains biases related to how thermochronological data are averaged(12) and to erosion hiatuses in glaciated landscapes(13). Here we investigate the 30 locations with reported accelerated erosion during the late Cenozoic(6). Our analysis shows that in 23 of these locations, the reported increases are a result of a spatial correlation bias-that is, combining data with disparate exhumation histories, thereby converting spatial erosion-rate variations into temporal increases. In four locations, the increases can be explained by changes in tectonic boundary conditions. In three cases, climatically induced accelerations are recorded, driven by localized glacial valley incision. Our findings suggest that thermochronology data currently have insufficient resolution to assess whether late-Cenozoic climate change affected erosion rates on a global scale. We suggest that a synthesis of local findings that include location-specific information may help to further investigate drivers of global erosion rates.
机译：数十年来，地球表面侵蚀率与全球气候变化之间的潜在联系引起了地球科学家的兴趣（1,2），因为这种耦合对硅酸盐风化作用（3,4）和有机碳埋藏（5）有影响。气候以及第四纪冰川在景观演化中的作用（1,6）。在全球范围的沉积速率的基础上，已经提出了响应于变凉的气候，全球新生代晚期侵蚀速率的增加（7）。然而，其他研究表明，全球侵蚀率可能保持稳定，这表明所报告的沉积物积累率增加是由于保存偏差，沉积裂隙和变化的测量间隔所致（8-10）。最近，全球热年代学数据汇编已被用来推断新生代晚期山地景观的侵蚀速率几乎增加了两倍（6）。有人认为这个结果没有影响沉积记录的偏见（11），尽管其他人则认为它包含与平均热年代学数据的平均值有关的偏见（12）和冰川景观中的侵蚀中断（13）。在这里，我们调查了新生代晚期侵蚀加速的30个地点（6）。我们的分析表明，在这些位置的23个中，报告的增加是空间相关偏差的结果，也就是说，将数据与不同的发掘历史相结合，从而将空间侵蚀率变化转换为时间上的增加。在四个位置，这种增加可以用构造边界条件的变化来解释。在三种情况下，记录了由局部冰川谷切口驱动的气候诱发的加速度。我们的发现表明，热年代学数据目前没有足够的分辨率来评估新生代晚期的气候变化是否在全球范围内影响侵蚀率。我们建议综合包括特定地点信息的本地调查结果可能有助于进一步调查全球侵蚀率的驱动因素。

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  • 来源
    《Nature》 |2018年第7712期|89-93|共5页
  • 作者

    Schildgen Taylor F.; van der Beek Pieter A.; Sinclair Hugh D.; Thiede Rasmus C.;

  • 作者单位

    IGFZ German Res Ctr Geosci, Potsdam, Germany;

    Univ Grenoble Alpes, Inst Sci Terre ISTerre, Grenoble, France;

    Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland;

    Univ Potsdam, Dept Earth & Environm Sci, Potsdam, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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