Latest Pleistocene and Holocene chronology of an eventful fluvial history.- The Rio Galera in North-Eastern Andalusia

多事的河流历史的最新更新世和全新世年表。- 安达卢西亚东北部的加莱拉河

• 批准号: 367255693
• 负责人: Professor Dr. Dominik Faust
• 金额: --
• 依托单位: Professur für Physische Geographie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/367255693?language=en
• 关键词: Latest; Pleistocene; Holocene; chronology; eventful

The main objective of the project is to establish a high-resolution chronology of the eventful fluvial history of the Rio Galera over the last 17000 years. The project will complete preliminary work that was done in order to detect characteristic fluvial sedimentation features. Dating will be realized on charcoal pieces, on organic macro remnants and on organogenic sediment layers, that are abundant in all profiles. We aim to reconstruct phases of the eventful fluvial history by dating the well distinctive and heterogenous sediment layers. From a first view we observed fine sedimentation in an early phase alternating with coarser layers indicating a change in flow velocity. The sequence (several profiles) is about 15 meters thick and ends with travertine layers alternating with intercalated floodplain sediments. Sedimentation is sometimes interrupted by short soil formation phases (initial soil forming features) or erosion phases indicated by incision features. Another objective of this project is to help solving the question whether the assumed climate forcing of the sedimentation process is superimposed by tectonic activity. Within the scope of the project we aim to supervise a Master thesis that will focus on the entire catchment of the Rio Galera (about 300 square kilometer) in order to investigate different river sections (upstream - downstream). The question is whether sedimentation features can be traced along the river course (degree of connectivity) or if different sections show different sedimentation features. The Baza-basin, in which the Rio Galera incised, is an endorheic depression formed during Plio-Pleistocene that was captured by the Rio Guadahortuna (Guadiana menor) which in fact is one of the frontal flow of the Rio Guadalquivir. The incision of the Rio Galera into the Plio-Pleistocene marls occurred during the middle and late Pleistocene indicated by fluvial stack terraces. After the youngest incision phase of the Rio Galera that is assumed to have happened during latest Pleistocene, this eventful but unexplored part of the fluvial history, in which sedimentation, stillstand and incision alternate, started. By means of a high-resolution chronology of the Rio Galera fluvial dynamics we will be able to contextualize this outstanding profile and compare them to important environmental archives of Andalusia and Central Spain.

该项目的主要目标是建立一个高分辨率的年表，在过去的17000年里，丰富的河流历史的里约加莱拉。该项目将完成为探测河流沉积特征而进行的初步工作。定年将在木炭片、有机宏观残留物和有机成因沉积层上实现，这些沉积层在所有剖面中都很丰富。我们的目标是重建阶段的多事件的河流历史，通过定年以及独特的和异质的沉积层。从第一个视图中，我们观察到在早期阶段与粗层交替的细沉积，表明流速的变化。该层序（几个剖面）约15米厚，末端为互层冲积平原沉积物。沉积作用有时被短的土壤形成阶段（初始土壤形成特征）或由切口特征指示的侵蚀阶段中断。该项目的另一个目标是帮助解决沉积过程的假定气候强迫是否被构造活动叠加的问题。在该项目的范围内，我们的目标是监督硕士论文，将重点放在整个流域的里约加莱拉（约300平方公里），以调查不同的河流部分（上游-下游）。问题是沉积特征是否可以沿着河道（连通程度）沿着追踪，或者不同的部分是否显示出不同的沉积特征。巴扎盆地，其中里约加莱拉切割，是一个内流洼地，形成于上新世更新世，被捕获的里约瓜达奥图纳（瓜迪亚纳menor），这实际上是一个前锋流的里约瓜达尔基维尔。Rio加莱拉进入上新世-更新世泥灰岩的切割发生在更新世中期和晚期，河流堆积阶地表明了这一点。在里约加莱拉最年轻的切割阶段（假设发生在更新世晚期）之后，开始了河流历史中这一多事但未被探索的部分，其中沉积、静止和切割交替出现。通过高分辨率的里约热内卢加莱拉河流动力学年表，我们将能够将这一杰出的配置文件，并将其与安达卢西亚和西班牙中部的重要环境档案进行比较。