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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Dating of erosion surface and terraces in the eastern Qilian Shan, northwest China
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Dating of erosion surface and terraces in the eastern Qilian Shan, northwest China

机译：中国西北祁连山侵蚀面和阶地的年代

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摘要

The actively deformed foreland of eastern Qilian Shan (mountains) contains well-preserved geomorphic features such as erosion surfaces, river terraces and tectonically uplifted alluvial fans, providing suitable archives for research on regional tectonic activities and palaeoclimatic changes. These geomorphic surfaces are well dated by using a combination of magnetostratigraphy, electron spin resonance, thermoluminescence, infra-red stimulated luminescence, radiocarbon dating, and correlation with the well-established loess-palaeosol sequences of China. Our results show that the erosion surface formed about 1.4 Ma ago, and the age of river terraces is 1.24 Ma, 820-860 ka, 780 ka, 420-440 ka, 230-250 ka, 140 ka, 60 ka and 10 ka, respectively. Valley incision rates of e. 0.09-0.25 m ka(-1) have been identified. The repetitive stratigraphic and geomorphic pattern of these terraces indicates the fluvial sedimentation-incision cycles are tightly associated with the 100-ka glacial-interglacial climatic cycles. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：祁连山东部（山地）活动变形的前陆具有保存完好的地貌特征，例如侵蚀面，河流阶地和构造抬升的冲积扇，为研究区域构造活动和古气候变化提供了合适的档案。通过结合地磁地层学，电子自旋共振，热致发光，红外激发发光，放射性碳测年以及与中国成熟的黄土古土壤序列的相关性，可以对这些地貌表面进行精确测年。我们的研究结果表明，侵蚀面大约在1.4 Ma之前形成，河阶的年龄为1.24 Ma，820-860 ka，780 ka，420-440 ka，230-250 ka，140 ka，60 ka和10 ka，分别。山谷切口率e。 0.09-0.25 m ka（-1）已被确定。这些阶地的重复地层和地貌模式表明，河流沉积-切入周期与100-ka冰间冰期气候周期紧密相关。版权所有（c）2006 John Wiley＆Sons，Ltd.

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