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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Episodic incision of the Colorado River in Glen Canyon, Utah
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Episodic incision of the Colorado River in Glen Canyon, Utah

机译：在犹他州格伦峡谷的科罗拉多河的情节切口

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摘要

Incision rates of the Colorado River are integral to understanding the development of the Colorado Plateau. Here we calculate episodic incision rates of the Colorado River based on absolute ages of two levels of Quaternary deposits adjacent to Glen Canyon, Utah, along the north flank of Navajo Mountain. Minimum surface ages are determined by a combination of cosmogenic radionuclide surface exposure ages, uranium series and soil-development formation times. Bedrock incision rates of the Colorado River between c. 500 ka and c. 250 ka, and c. 250 ka to present are c. 0.4 m ka(-1) and c. 0.7 m ka(-1), respectively. These rates are more than double the rates reported in the Grand Canyon, suggesting that the Colorado River above Lees Ferry is out of equilibrium with the lower section of the river. We also determine incision rates of two tributaries to the Colorado River. Oak Creek and Bridge Creek flow off Navajo Mountain into Glen Canyon from the southeast. Oak Creek and Bridge Creek both have incision rates of c. 0.6 to ka(-1) over the past c. 100 ka at points about 9 km away from the main stem of the Colorado River. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：科罗拉多河的切开率对于了解科罗拉多高原的发展必不可少。在这里，我们根据纳瓦霍山北翼与犹他州格伦峡谷相邻的两级第四纪沉积物的绝对年龄，计算科罗拉多河的偶发切开率。最低表面年龄由宇宙成因放射性核素表面暴露年龄，铀系列和土壤发育形成时间共同决定。科罗拉多河之间的基岩切开率c。 500 ka和c。 250 ka，和c。到250 ka为止c。 0.4 m ka（-1）和c。分别为0.7 m ka（-1）。这些比率是大峡谷中报告的比率的两倍多，这表明在Lees Ferry之上的科罗拉多河与河的下游部分处于不平衡状态。我们还确定了科罗拉多河的两个支流的切开率。橡树溪（Oak Creek）和布里奇溪（Bridge Creek）从纳瓦霍山（Navajo Mountain）从东南流入格伦峡谷（Glen Canyon）。橡树溪和布里奇溪的切开率均为c。在过去的0.6至ka（-1）c。在距科罗拉多河主干约9公里处的点处为100 ka。版权所有（c）2005 John Wiley＆Sons，Ltd.

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