https://orcid.org/0000-0001-6605-3912
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ABSTRACT
Passive continental margins can show anomalously high topography and exhibit a discrete steep escarpment, divide, and gentle slope from the exterior to the interior of the margin. Compared with active (i.e. convergent and strike-slip) tectonic regions, the processes and rates of change of high-altitude landscapes driven by tectonics and/or climate in tectonically inactive (passive) continental margins are poorly understood. We used 10Be catchment-wide denudation rates of fluvial sands (n = 29) collected in 17 catchments and 12 sub-catchments, as well as topographic analysis, to quantify the rate of landscape change along the western flank of the Taebaek Mountain Range (TMR). The denudation rates range from ∼20 to ∼70 mm/ka. These rates show no significant difference between upstream and downstream areas, implying that denudation is not (or is only negligibly) affected by deep-seated mass wasting processes and human impact. 10Be denudation rates in the northern TMR are 1.6 times higher than in the south. In addition, the relationship between denudation rates and geomorphic parameter values also differs from north to south. These observed spatial differences in the rate of denudation and geomorphic response can be explained by intense frost weathering rather than lithological control. Our quantitative analysis of denudation rates and topography suggests that southwest-directed migration of the range’s main divide occurs and that the range's western flank (low relief) is likely to be in a geomorphic state of quasi-equilibrium whereas the eastern flank (steep) still remains transient.
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Notes on contributors
Dong-Eun Kim
Dong-Eun Kim is a senior researcher at the Korea Institute of Geoscience and Mineral Resources (KIGAM) (2021-present). He did degrees at Korea University (B.S., M.S., and Ph.D., 2019) and worked at Tulane University (2019-2020, Supervisor: Dr.Nicole Gasparini). His research interest mainly involves using satellite images, UAV data (point cloud, photos), Quaternary geology (field survey), geochronology (10Be, OSL, and 14C), and geomorphology (GIS) techniques to study active deformation by tectonics and climate. He also studies paleoseismology in the intraplate region and the 2D landscape evolution model (LEM) by Python (Land lab) to better understand the landscape's history.
Yeong Bae Seong
Yeong Bae Seong is teaching and doing research at Department of Geography Education, Korea University, Seoul, Korea. Over the last 20 years, he has been working at ‘dryland’ using “cosmogenic nuclides such as 10Be, 26Al, 36Cl, to constrain the rate of change of earth surface. He has been digging the earth, geographically from Antarctica through Himalaya-Tibet to Mongolia and central Asia. He runs a cosmogenic nuclide dating lab and is actively collaborating with the laboratory of 6 MV Accelerator Mass Spectrometry at Korea Institute of Science and Technology, Seoul, Korea.
John Weber
John Weber did degrees at Moraine Valley Community College (A.S.), Southern Illinois University (B.S. and M.S.), and Northwestern University (Ph.D. Advisors: Bob Speed, Seth Stein). He is currently a Professor of Geology at Grand Valley State University (Allendale, MI, USA) where he teaches and does research with undergraduate Geology majors. He also teaches summer geology field school in Red Lodge and Dillon MT (USA) and in Baku, Azerbaijan. His research mainly involves using GPS satellite data, and structural geology, geochronology and geomorphology techniques to study active and fossil deformation. He also studies meteorite impact craters, and regularly consults for the petroleum industry. John was elected a GSA Fellow in 2014.
Byung Yong Yu
Byung Yong Yu is a senior researcher working at the laboratory of Accelerator Mass Spectrometry in the Korea Institute of Science and Technology (KIST). KIST has a 6 MV AMS facility and he is leading the AMS Laboratory. His research fields center around age dating, new drug development studies, geo-science studies, and environmental studies using AMS. He has been actively doing research about analysis of 10Be, 14C, 26Al, 36Cl, 41Ca, and 129I in the various samples using KIST AMS over the 20+ years.