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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Possible climatic controls on the accumulation of Peru's most prominent alluvial fan: The Lima Conglomerate
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Possible climatic controls on the accumulation of Peru's most prominent alluvial fan: The Lima Conglomerate

机译：秘鲁最突出的冲积风扇积累可能的气候控制：利马集团

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摘要

Sediment accumulation can occur in response to a change in either tectonic or climatic driving forces. Here, we explore these controls on the deposition of the Lima Conglomerate, Peru. We use a combination of quantitative methods to explore the age of sediment accumulation, the provenance of the material and the paleo-erosion rates recorded by these deposits. Isochron burial dating with cosmogenic Be-10 and Al-26 yield an age of c. 500ka for the base (490 +/- 70ka) and the uppermost sample situated c. 30m higher upsection (490 +/- 80ka). Results of paleo-erosion rate estimates with concentrations of in situ(10)Be show a c. 60% increase from 105 +/- 10mmka(-1) for the base to 169 +/- 14mmka(-1) for the uppermost sample. Finally, provenance tracing with in situ U/Pb ages on detrital zircon implies that the material has been derived from the entire drainage basin. The combination of results suggests that sediment accumulation occurred in response to an erosional pulse, which affected the entire basin within a short time interval. Because Be-10 data represents a large spatial record of erosion, we exclude the possibility where a breakout of a lake or a focused release of material in response to earthquakes, were responsible for the large material flux. Instead, the erosional pulse was likely to have occurred at the scale of the entire basin, supporting the idea of a larger-scale, most likely climate driven control. In this context, the accumulation age of c. 500ka falls into an orbital cycle fostering the emerging picture in the literature that sediment routing in the Andes have most likely been driven by climate and cyclic changes. We suggest that the Andean mountain range offers an ideal laboratory to explore the erosional history in relation to climate patterns, at least in Peru. (c) 2018 John Wiley & Sons, Ltd.
机译：沉积物积累可以响应于构造或气候驱动力的变化而发生。在这里，我们探讨了秘鲁利马集团沉积的这些控制。我们使用定量方法的组合来探索沉积物积累的年龄，材料的出处和这些沉积物记录的古侵蚀率。同学与宇宙原性Be-10和Al-26的约会，含量为c。底座（490 +/- 70ka）和最上面的样品为500ka。 30米更高的上游（490 +/- 80Ka）。古侵蚀率估计的原位（10）的浓度估算显示为C.从105 +/- 10mmka（-1）增加60％，用于最高的样品的基础为169 +/- 14mmka（-1）。最后，在碎屑锆石上用原位U / Pb年龄的原位跟踪意味着该材料已来自整个排水盆地。结果的组合表明，沉积物积累响应于侵蚀脉冲而发生，这在短时间内影响整个盆地。因为BE-10数据代表了大量的侵蚀空间记录，所以我们排除了湖泊突破或聚焦释放的材料响应地震的可能性，负责大型物质通量。相反，侵蚀脉冲可能发生在整个盆地的尺度上，支持较大规模，最可能是气候驱动控制的想法。在这种情况下，c的累积年龄。 500ka落入一个轨道周期，培养了在文献中的沉积物路线中最有可能被气候和循环变化驱动的沉积物的曲线周期。我们建议安第斯山脉提供理想的实验室，以探索与气候模式有关的侵蚀历史，至少在秘鲁。 （c）2018 John Wiley＆Sons，Ltd。

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