Early - Midholocene paleoenvironmental shifts and related seasonalities in Andalusia

在DFG资助的两个项目中，我们能够通过西安达卢西亚和东安达卢西亚的河流动力学来描述早、中全新世古环境条件的基本情况。该项目基于从Guadalete河(下游段)和Galera河的档案中获得的知识。我们集中于一个时间跨度(9-5ka)，并调查了里奥瓜达莱特河下游厚度达到4.5米的土壤形成和冲积沉积(Wolf等人。拉伊纳3号剖面)，以及里奥加雷拉中段高达5米的凝灰岩形成，以获得高分辨率的冲积史。里奥加莱拉的凝灰岩是由雨水提供的(佩德利2009年后的S·凝灰岩模型)，可以进行同位素分析和进一步的地球化学调查。这个项目的挑战是测试两种方法的组合。一方面，我们的目标是通过河流档案研究(软体动物和凝灰岩)更好地确定有关时间跨度的古环境变迁。另一方面，我们的目标是通过稳定同位素分析(δ13C和δ18O)，以病理性年代学方法为基础，得出环境季节性模式。因此，我们使用的蜗牛壳来自成年物种和年代较早的蛋鸡。有了这些年代学数据，我们也许能够描绘出关于温度和降水的年际信息，这将使我们对过去环境和气候变化的图景更加完整。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研究，从而为深入解释奠定基础。

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.