The Role of Past Climatic Variability in Fluvial Terrace Formation, a Case Study from River Mureş (Maros), Romania

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-06-02 DOI:10.3390/quat6020035
Tamás Bartyik, P. Urdea, T. Kiss, Alexandru Hegyi, G. Sipos
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Abstract

Fluvial terrace formation is a complex process governed by the interplay of climatic and tectonic forcings. From a climatic perspective, an incision is usually related to climatic transitions, while valley aggradation is attributed to glacial periods. We have reconstructed the formation of Late Pleistocene fluvial terraces along the middle, mountainous section of a temperate zone river (Mureş/Maros) in order to identify the roles of different climatic periods and potential vertical displacement in terrace development. Investigations were based on two profiles representing two different terrace levels. The profiles were subjected to sedimentological and detailed geochronological analyses using optically stimulated luminescence (OSL). The results indicated that the investigated terraces represent different incision events coinciding with climatic transition periods. However, a joint MIS 3 valley aggradation period can be identified at both of them. Thus, the relatively mild but highly variable climate of the MIS 3 facilitated sediment mobilization from upland catchments. On the other hand, there is no evidence of aggradation under the cold and stable climate of MIS 2. However, the tectonic setting favours incision at the site. Based on our results, we concluded that the timing of the main events was controlled primarily by climatic forcing. The terrace formation model recognised might also be applied at other rivers in the region.
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过去气候变率在河流阶地形成中的作用——以罗马尼亚穆雷伊河(马罗斯)为例
冲积阶地的形成是一个复杂的过程,受气候和构造作用力的影响。从气候角度来看,切口通常与气候转变有关,而山谷沉积则归因于冰川期。我们重建了沿温带河流(Mureş/Maros)中部山区的晚更新世河流阶地的形成,以确定不同气候时期和潜在垂直位移在阶地发育中的作用。调查基于代表两个不同阶地水平的两个剖面。利用光学激发发光(OSL)对剖面进行了沉积学和详细的地质年代分析。研究结果表明,所调查的阶地代表了与气候过渡期相吻合的不同切割事件。然而,在这两处都可以确定MIS 3河谷的联合沉积期。因此,MIS 3相对温和但高度多变的气候有助于从高地集水区调动沉积物。另一方面,在MIS 2寒冷稳定的气候条件下,没有沉积的证据。然而,构造环境有利于在现场进行切割。根据我们的结果,我们得出结论,主要事件的发生时间主要由气候强迫控制。已识别的阶地形成模型也可应用于该地区的其他河流。
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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