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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Erosion of a high-altitude, low-relief area on the Korean Peninsula: implications for its development processes and evolution
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Erosion of a high-altitude, low-relief area on the Korean Peninsula: implications for its development processes and evolution

机译：朝鲜半岛高海拔，低起伏地区的侵蚀：对其发展进程和演变的影响

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摘要

The processes involved in the development of high-altitude, low-relief areas (HLAs) are still poorly understood. Although cosmogenic nuclides have provided insights into the evolution of HLAs interpreted as paleo-surfaces, most studies focus on estimating how slowly they erode and thereby their relative stability. To understand actual development processes of HLAs, we applied several techniques of cosmogenic nuclides in the Daegwanryeong Plateau, a well-known HLA in the Korean Peninsula. Our denudation data from strath terraces, riverine sediments, soils, and tors provide the following conclusions: (1) bedrock incision rate in the plateau (similar to 127m Myr(-1)) is controlled by the incision rate of the western part of the Korean Peninsula, and is similar to the catchment-wide denudation rate of the plateau (similar to 93m Myr(-1)); (2) the soil production function we observed shows weak depth dependency that may result from highly weathered bedrock coupled with frequent frost action driven by alpine climate; (3) a discrepancy between the soil production and catchment-wide denudation rates implies morphological disequilibrium in the plateau; (4) the tors once regarded as fossil landforms of the Tertiary do not reflect Tertiary processes; and (5) when compared with those of global paleo-surfaces (<20m Myr(-1)), our rapid denudation rates suggest that the plateau cannot have maintained its probable initial paleo landscape, and thus is not a paleo-surface. Our data contribute to understanding the surface processes of actively eroding upland landscapes as well as call into question conventional interpretations of supposed paleo-surfaces around the world. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：人们对高海拔，低起伏地区（HLA）的开发过程仍然知之甚少。尽管宇宙成因核素提供了对被解释为古表面的HLA进化的见解，但大多数研究仍侧重于估计它们腐蚀的速度，以及它们的相对稳定性。为了了解HLA的实际发展过程，我们在朝鲜半岛著名的HLA大关岭高原应用了多种宇宙成因核素技术。我们从地层阶地，河流沉积物，土壤和土壤的剥蚀数据得出以下结论：（1）高原的基岩切开速率（类似于127m Myr（-1））受西部切开速率的控制。朝鲜半岛，与高原的全流域剥蚀率相似（类似于93m Myr（-1））; （2）我们观察到的土壤生产函数显示出深度依赖性弱，这可能是由于高度风化的基岩加上高山气候驱动的频繁霜冻作用所致; （3）土壤产量与集水区总剥蚀率之间的差异意味着高原地区的形态不平衡。 （4）曾经被视为第三纪化石地貌的tors没有反映第三纪的过程; （5）与全球古地表（<20m Myr（-1））相比，我们的快速剥蚀速率表明高原不能保持其可能的初始古地貌，因此不是古地表。我们的数据有助于理解活跃侵蚀的高地景观的地表过程，并质疑世界上假设的古地表的常规解释。版权所有（c）2015 John Wiley＆Sons，Ltd.

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