Chronology of fluvial erosion. - A scenario of quaternary geodynamics from the model region Baza/Guadix.

安达卢西亚东北部的Baza/Guadix盆地面积约为6000km2，在中更新世之前是一个内海坳陷，沉积了来自框架山的各种粒度的沉积物。沉积开始于上新世前不久。后来，这个盆地被瓜达尔基维尔盆地的源头所占据，直到今天，这些源头已经切入了300米深的沉积物。自捕获以来，退行侵蚀已达90多公里长。捕获发生的时间仍然是密集科学讨论的主题，尽管在1000 ka和43 ka之间的假设有所不同。然而，可以假设捕获的时间几乎不少于50万年前。在地貌学研究中，逆向侵蚀的概念仍有许多未解之谜。在考虑的这段时间内，向后侵蚀是如何发生的，尤其是以什么速度发生的，还没有得到调查。所提出的项目的目的是近似该模型区域的侵蚀切口和后退侵蚀速率，并更好地划定捕获时间。适宜的时间标志是阶地沉积形式的河流对河谷的填充物，以及不同世代的石灰华和烧结地层，它们是由于泉水的涌出而在河谷两侧形成河流切割后形成的。我们将能够通过绘制和记录山谷填充物以及广泛的年代测定来模拟向后的侵蚀。通过这种方法，本项目将大大拓展对后向侵蚀现象的认识和认识，并为该示范区第四纪景观的发展做出重要贡献。

The basin of Baza/Guadix in the northeastern part of Andalusia with a size of about 6000km2 was until the Middle Pleistocene an endorheic depression, into which sediments of all grain sizes originated from the framing mountains were deposited. Deposition started shortly before the Pliocene. Later the basin was captured by the head-waters of the Rio Guadalquivir, which have incised into the sediments to a depth of 300 meters until today. Since the time of capturing, the regressive erosion has reached a river length of more than 90 km. When the capture took place is still subject of intensive scientific discussion, although the assumptions on this vary between 1000 ka and 43 ka. However, it can be assumed that the time of capture was hardly less than 500,000 years ago.In geomorphological research, the concept of backward erosion still leaves many questions unanswered. How, and above all at what velocity, backward erosion takes place has not yet been investigated for the time period under consideration.The aim of the proposed project is to approximate the rate of erosive incision and regressive erosion in this model region and to better delimit the time of capturing. Suitable time markers are the valley fillings of the rivers in the form of terrace deposits, but also the travertine and sinter formations of different generations, which were formed after river incision on the valley flanks as a result of crop-out of springs. We will be able to model the backward erosion by mapping and recording of the valley fillings and by extensive dating. With this approach, the proposed project will significantly expand the ideas and the state of knowledge on the phenomenon of backward erosion and make an important contribution to the quaternary landscape development of this model region.