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DOI10.1016/j.geomorph.2018.12.019
Quaternary evolution of the Plounice River system (Bohemian Massif) based on fluvial deposits dated with optically stimulated luminescence and in situ produced cosmogenic nuclides
Stor, T.1; Schaller, M.2; Merchel, S.3; Martinek, K.1; Rittenour, T.4; Rugel, G.3; Scharf, A.3
发表日期2019
ISSN0169-555X
EISSN1872-695X
卷号329页码:152-169
英文摘要

The Plounice River system, located in the central Bohemian Massif, is draining an area almost not covered by continental ice sheets but instead archiving the fluvial deposits. The fluvial style changes from a high-energy braided to a long-bend meandering river in the upper terrace levels (36 to 29 m above present floodplain). The middle terrace levels (22 to 14 m above present floodplain) indicate a fluvial style changing from a high- to medium-energy braided river. In the lower terrace levels (13 to 5 m above present floodplain), the terrace deposits indicate high-energy braided to long-bend meandering river environments. To provide greater details on the timing of fluvial terrace formation, this study applied (26)A1 and Be-10 isochron burial and optically stimulated luminescence (OSL) dating methods to terraces of the Plounice River system. Terrace fluvial infills are dated with isochron burial dating in relative altitude 34, 29, and 14 m above present floodplain (apf); whereas terrace accumulations in relative altitude 19, 12, and 6 m apf are dated with OSL. Because of differences in age results between the two dating methods, we propose two different evolution models: the first is based on isochron burial and OSL dating, and the second model is on OSL dating results only. The time span represented by the river terraces remains unclear and varies from Eburonian to Weichselian (1680 to 56 ka) or from Saalian to Weichselian (138 to 56 ka) with the estimation of the highest terrace (248 ka) respectively. The former river evolution model is based on tectonic activity at least since 1000 ka. Morphotectonic analysis recognized new lineaments of which the general direction corresponds with the main direction of the Ohre fault zone (NE- to ENE-striking) and Lace fault zone (NW-striking). Based on dated terrace ages of 1153 +/- 123 ka at 14 m apf and 138 +/- 21 ka at 19 m above present floodplain, we propose a normal fault being active from at least 1153 ka. The second river evolution model assumes possible remobilization of clasts analyzed by isochron burial dating before their final deposition. From three OSL ages we calculated a mean incision rate and estimated an age of upper terrace levels at 34 m apf to be 248 +/- 38 ka (Saalian age). As remobilization of clasts in high-energy fluvial and glaciofluvial environments is very likely, age determination is challenging. Nevertheless, we interpret the terrace record in the Ploucnice River system as a product of Quaternary climatic changes influenced by tectonic processes. (C) 2019 Elsevier B.V. All rights reserved.


WOS研究方向Physical Geography ; Geology
来源期刊GEOMORPHOLOGY
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/94946
作者单位1.Charles Univ Prague, Fac Sci, Inst Geol & Palaeontol, Albertov 6, Prague 12843 2, Czech Republic;
2.Univ Tubingen, Dept Geosci, Wilhelmstr 56, D-72074 Tubingen, Germany;
3.HZDR, D-01328 Dresden, Germany;
4.Utah State Univ, Dept Geol, 4505 Old Main Hill, Logan, UT 84322 USA
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Stor, T.,Schaller, M.,Merchel, S.,et al. Quaternary evolution of the Plounice River system (Bohemian Massif) based on fluvial deposits dated with optically stimulated luminescence and in situ produced cosmogenic nuclides[J],2019,329:152-169.
APA Stor, T..,Schaller, M..,Merchel, S..,Martinek, K..,Rittenour, T..,...&Scharf, A..(2019).Quaternary evolution of the Plounice River system (Bohemian Massif) based on fluvial deposits dated with optically stimulated luminescence and in situ produced cosmogenic nuclides.GEOMORPHOLOGY,329,152-169.
MLA Stor, T.,et al."Quaternary evolution of the Plounice River system (Bohemian Massif) based on fluvial deposits dated with optically stimulated luminescence and in situ produced cosmogenic nuclides".GEOMORPHOLOGY 329(2019):152-169.
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