Geomorphological evolution in transitional environments on the eastern coast of Brazil

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Vinícius Borges Moreira, Luca Lämmle, Bruno Araújo Torres, Carlo Donadio, Archimedes Perez Filho
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Abstract

The morphology of the coastal landscape in transitional environments results from the gradual and complex dynamics of natural processes at different scalarity, capable of elaborating and remodeling the relief. Their arrangements and interactions are reflected in the configuration and evolution of the landscape and waterscape governed by allogenic factors (climate, tectonics and, more recently, anthropogenic) generating autogenic responses in environmental systems. In this sense, several studies have demonstrated the importance of sea level oscillations, sedimentary balance and river-coastline displacements associated with climate fluctuations during the Quaternary. However, there is still a relative lack of recent research that focuses on the last glacial maximum (LGM) and the Holocene for the eastern Brazilian coast. In this way, the intense morphodynamics between estuarine and deltaic systems could become interpretative keys in the general understanding of these environments worldwide because they are located in a particular context within the connectivity of these geomorphological systems. To investigate these processes between the Jequitinhonha, Pardo and Una Rivers, detailed mapping and geomorphic topographic profiles were carried out using pre-selected digital elevation models, and fieldworks were carried out on land and water to validate the mappings and to collect samples. Then, they were subjected to geochronological analysis using Optically Stimulated Luminescence and grain size distribution to recognize the depositional age and characterize the surficial cover. It was possible to identify five depositional landscape units: fluvial terraces, fluvial-marine terraces and three staggered levels of marine terraces. Based on these results, a paleogeographic reconstruction of the evolutionary phases of this eastern sector of Brazil's coast was carried out, chronologically covering the Pleistocene/Holocene transition up to the present. The aim is to understand littoral dynamics as a response to both fluvial adjustments and oscillations of the regional relative sea level.

Abstract Image

巴西东海岸过渡环境中的地貌演变
过渡环境中沿岸景观的形态是由不同尺度的自然过程的渐进和复杂的动态变化产生 的,这些自然过程能够细化和重塑地形。它们的排列和相互作用反映在地貌和水景的配置和演变中,而地貌和水景的配置和演变又 受各种外来因素(气候、构造以及最近的人为因素)的制约,并在环境系统中产生自发的反 应。从这个意义上讲,一些研究已经证明了第四纪期间与气候波动相关的海平面振荡、沉积平衡和河流-海岸线位移的重要性。然而,近期针对巴西东部海岸末次冰川大期(LGM)和全新世的研究仍相对缺乏。因此,河口和三角洲系统之间的强烈形态动力学可以成为解释世界范围内这些环境的关键,因为它们位于这些地貌系统连通性的特定环境中。为了研究杰奎廷洪哈河、帕尔多河和乌纳河之间的这些过程,我们使用预先选定的数字高程模型进行了详细测绘和地貌地形剖面图,并在陆地和水上进行了实地考察,以验证测绘结果并采集样本。然后,利用光刺激发光法和粒度分布法对样本进行地质年代分析,以确定沉积年代和表层覆盖物的特征。最终确定了五个沉积地貌单元:河流阶地、河流-海洋阶地和三个交错层次的海洋阶地。根据这些结果,对巴西东部海岸的演变阶段进行了古地理重建,按时间顺序涵盖了更新世/全新世过渡至今的阶段。这样做的目的是为了了解沿岸的动态变化是对河流调整和区域相对海平面振荡的反应。
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来源期刊
Earth Surface Processes and Landforms
Earth Surface Processes and Landforms 地学-地球科学综合
CiteScore
6.40
自引率
12.10%
发文量
215
审稿时长
4 months
期刊介绍: Earth Surface Processes and Landforms is an interdisciplinary international journal concerned with: the interactions between surface processes and landforms and landscapes; that lead to physical, chemical and biological changes; and which in turn create; current landscapes and the geological record of past landscapes. Its focus is core to both physical geographical and geological communities, and also the wider geosciences
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