Early - Midholocene paleoenvironmental shifts and related seasonalities in Andalusia

在DFG资助的两个项目中，我们能够通过西和东安达卢西亚的河流动力学来描绘早全新世和中全新世古环境条件的基本原理。该项目基于从Guadalete河（下游）和Galera河的档案中获得的知识。为了获得高分辨率的冲积历史，我们集中研究了9 - 5 ka的时间跨度，研究了里约热内卢Guadalete下游4.5米厚的土壤形成和冲积沉积（Wolf et al. 2013； La Ina 3剖面），以及里约热内卢Galera中段高达5米厚的凝灰岩形成。里约热内卢Galera的凝灰岩由雨水滋养（peley 2009之后的凝灰岩模型），适合同位素分析和进一步的地球化学研究。这个项目的挑战是测试两种方法方法的组合。一方面，我们的目的是通过河流档案研究（软体动物和凝灰岩）来更好地研究有关时间跨度的古环境变化。另一方面，我们的目标是通过稳定同位素（δ13C和δ18O）分析（基于年代法）来确定环境季节性模式。因此，我们使用的是成年蜗牛和年代久远的蜗牛壳。有了这些年代数据，我们也许能够描绘出关于温度和降水的年际信息，从而完成我们对过去环境和气候变化的描绘。我们认为，将这两种方法结合起来，将大大有助于对我们的沉积学档案进行高分辨率的研究，从而为深刻的解释奠定基础。

In two by the DFG funded projects we were able to depict the fundamentals about Early- and Midholocene paleoenvironmental conditions by means of fluvial dynamics in West and East-Andalusia. This project is based on knowledge obtained from archives of the rivers Guadalete (downstream section) and Galera. We concentrate on a timespan (9 – 5 ka) and investigated soil formation and alluvial deposits in the downstream section of the Rio Guadalete that reached a thickness of 4.5 meters (Wolf et al. 2013; Profile La Ina 3), and tufa formation in the middle course of the Rio Galera that reached up to 5 m in order to obtain a high resolution alluvial history. The tufas at the Rio Galera were fed by rainwater (s. tufa models after PEDLEY 2009) and are qualified for isotope analyses and for further geochemical investigations. The challenge of this project is to test the combination of two methodological approaches. On the one hand we aim to better work out paleoenvironmental shifts by means of fluvial archive study (molluscs and tufas) for the concerned time span. On the other hand we aim to work out environmental seasonality patterns by means of stable isotope analysis (δ13C and δ18O) based on a sclerochronological approach. Therefor we use snail shells from adult species and from well-dated layers. With these sclerochronological data we may be able to depict interannual information on temperature and precipitation that will complete our picture of past environmental and climate variability. We think to combine these two approaches will substantially contribute to a high-resolution research of our sedimentological archives and hence prepare the ground for a profound interpretation.