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首页> 外文期刊>Journal of Asian earth sciences >The role of the Haiyuan Fault in accelerating incision rate of the Yellow River at the Mijia Shan Area, northeastern Tibetan Plateau, as revealed by in-situ ~(10)Be dating
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The role of the Haiyuan Fault in accelerating incision rate of the Yellow River at the Mijia Shan Area, northeastern Tibetan Plateau, as revealed by in-situ ~(10)Be dating

机译：海园故障在东北藏高原米嘉山地区黄河加速率的作用，正如原位透露的那样，〜（10）是约会

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摘要

In this study, we employed cosmogenic nuclide Be-10 analysis to determine the formation ages of the Yellow River terraces in the Mijia Shan and the Laolongwan Basin at the northeastern periphery of the Tibetan Plateau. The aim of this study is to determine local fluvial incision rates and the effect from tectonic activities. The two sets of terraces were surveyed in field and dated by cosmogenic Be-10 exposure dating method. The results show that the best-fitting terrace ages in the Mijia Shan are respective 68.0(-9.4)(+11.2)V ka for T11 and 174.7(-38.4)(+52) ka for T14. In addition, in the Laolongwan basin, sample S3 constrains an age of 123.9 +/- 2.7 ka and S2 yields an age of 45.0 +/- 1.8 ka. Combining the strath heights of the sampled terraces, the fluvial incision rates were determined. The results showed that the fluvial incision rate of the Yellow River is similar to 1.94 mm/a in the Mijia Shan over the last 175 ka, while a much lower incision rate of similar to 0.73 mm/a is yielded in the Laolongwan Basin since the last similar to 120 ka. The incision rate in the Mijia Shan is almost twice more than that in the Laolongwan Basin. Considering the same climatic condition in both the Mijia Shan and the Laolongwan Basin, the difference between the two incision rates (similar to 1.21 mm/a) might be due to local tectonic deformation which is derived from the Haiyuan active strike-slip fault. Consequently, our results showed that the Haiyuan fault plays an important role in accelerating the incision rate in the Mijia Shan. Hence, it is suggested that the role of the main geological structures across the main river should also be considered when studying the evolution of terraces of big rivers.
机译：在这项研究中，我们使用的核酸核素是-10分析，以确定Mijia Shan和Laolongwan盆地的黄河露台的形成年龄在藏高高原东北部。本研究的目的是确定局部河流切口率和构造活动的效果。两套露台在现场进行了调查，并通过美容为-10曝光约会方法进行。结果表明，MIJIA Shan中最合适的露台年龄在T11和174.7（-38.4）（+ 52）KA的T11和174.7（-38.4）（+ 52）KA各自为68.0（-9.4）（+ 11.2）v Ka。此外，在Laolongwan盆地中，样品S3约束123.9岁+/- 2.7ka，S2的55.0岁+/- 1.8 ka。结合采样露台的钟表高度，确定了河流切口率。结果表明，黄河的河流切口率在过去的175 ka中，在Mijia Shan中类似于1.94 mm / a，同时在Laolongwan盆地中产生了与0.73毫米/毫升相似的切口率。最后类似于120 ka。 Mijia Shan的切口率几乎是劳龙湾盆地的两倍。考虑到Mijia Shan和Laolongwan盆地的相同气候条件，两种切口率（类似于1.21毫米/ A）之间的差异可能是由于局部构造变形，这些变形是由海源主动滑行故障的衍生。因此，我们的结果表明，海源故障在加速Mijia Shan的切口率方面发挥着重要作用。因此，建议在研究大河梯田的演变时，也应考虑主要地质结构的作用。

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