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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Transverse canyon incision and sedimentary basin excavation driven by drainage integration, Aravaipa Creek, AZ, USA
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Transverse canyon incision and sedimentary basin excavation driven by drainage integration, Aravaipa Creek, AZ, USA

机译：横向峡谷切口和沉积盆地挖掘由排水整合驱动，Aravaipa Creek，AZ，USA

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摘要

Drainage reorganization events have the potential to drive incision and erosion at high rates normally attributed to tectonic or climatic forcing. It can be difficult, however, to isolate the signal of transient events driven by drainage integration from longer term tectonic or climatic forcing. We exploit an ideal field setting in Aravaipa Creek Basin of southeastern Arizona, USA, to isolate just such a signal. Aravaipa Creek Basin underwent a period of transient incision that formed Aravaipa Canyon, evacuating a significant volume of sedimentary basin fill and Tertiary bedrock from the previously internally drained basin. We use digital terrain analyses to reconstruct the pre-incision landscapes of both Aravaipa Creek Basin and the adjacent Lower San Pedro Basin, which we use to quantify the magnitude of incision and erosion since the drainage basins integrated. Terrestrial cosmogenic nuclide burial dates from Be-10 and Al-26 concentrations in latest stage basin fill in Aravaipa Creek enable us to calculate long-term incision and erosion rates from 3 Myr to the present. A Be-10 concentration-depth profile from the Lower San Pedro Basin confirms that the San Pedro River incised into its high stand deposits prior to 350 000-400 000years ago. Combining our landscape reconstructions with these age constraints, we determine that the transient rates of incision that created Aravaipa Canyon were 150m/Myr or more, but that the background rate of erosion since integration is an order of magnitude lower, between 10 and 20m/Myr. These results support our growing understanding that tectonic and climatic forcings need not apply for all episodes of rapid, transient incision and erosion during landscape evolution. (c) 2018 John Wiley & Sons, Ltd.
机译：排水重组事件有可能在通常归因于构造或气候迫使的高速率下驱动切口和侵蚀。然而，它可能很困难，隔离通过从长期构造或气候迫使的排水整合驱动的瞬态事件的信号。我们利用美国东南部的Aravaipa Creek盆地的理想田野环境，仅抵消了这样的信号。 Aravaipa Creek盆地经历了一段时间的瞬态切口，形成了Aravaipa峡谷，从前内部排水盆地撤离了大量沉积盆地填充和三级基岩。我们使用数字地形分析来重建Aravaipa Creek盆地和邻近的San Pedro盆地的预切口景观，这是为了量化由于排水盆地集成的引流盆来量化切口和侵蚀的幅度。最近舞台盆地的陆生物核酸核素墓葬埋藏日期为Aravaipa Creek填补了Aravaipa Creek，使我们能够从3 Myr到现在计算长期切口和侵蚀率。来自较低的San Pedro盆地的BE-10浓度深度曲线证实，圣佩德罗河在350 000-400 000年前之前切入其高支架存款。将我们的景观重建与这些年龄约束相结合，我们确定创建Aravaipa峡谷的切口的瞬态率为150米/莫尔或更高，但由于整合以来的侵蚀的背景速率是较低的数量级，在10到20米/ myr之间。这些结果支持我们越来越多的理解，构造和气候强制无需在景观进化期间迅速，瞬态切口和侵蚀的所有事件申请。 （c）2018 John Wiley＆Sons，Ltd。

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