Kim, Dong-Eun Weber, John Seong, Yeong Bae Reminga-DeYoung, Katy Yu, Byung Yong 2024-01-19T10:00:22Z 2024-01-19T10:00:22Z 2023-03-23 2023-04 0091-7613 https://pubs.kist.re.kr/handle/201004/113879 The origin of relatively high topography in intraplate settings is elusive. The St. Fran-cois Mountains, a tectonically inactive region with high relief, a Mesoproterozoic granite and rhyolite core, and Paleozoic sedimentary flanks, provide insights into the evolution of intraplate landscapes. We determined 14 in situ 10Be exposure ages, 23 10Be catchment-wide denudation rates (CWDRs), and geomorphic indices using a geographic information system, and we modeled surface uplift using an isostatic-flexure model. CWDRs varied from similar to 5 to 10 +/- 1.7 mm/k.y. and averaged 1.5 times greater in streams draining granite and rhyolite than in those draining flanking sedimentary rocks. In situ results from bedrock strath ter-races gave Quaternary incision ages and incision rates that were tenfold higher than CW-DRs. Major knickpoints (locally called shut-ins), all at 200 +/- 70 m elevation, are located at contacts between the igneous and sedimentary rocks. Our exposure and denudation results inform isostatic-flexural modeling, which together support the conclusion that late Quater-nary-Recent surface uplift driven by differential density and erosion focused in the igneous core is creating significant topography and relief in this intraplate setting. English Geological Society of America Late Quaternary-Recent intraplate topographic uplift of the St. Francois Mountains (Ozark Plateau), Missouri (USA), driven by differential density and erosion Article 10.1130/G50585.1 1 Geology, v.51, no.4, pp.356 - 361 Geology 51 4 356 361 N scie scopus 001006021400007 Geology Geology Article; Early Access RATES BE-10 MODEL ROCKS