"Sedimentation patterns on Lanzarote reflecting quaternary environmental changes in the Eastern Canaries and North Africa."

大约1000年前，一座火山在加那利群岛富尔特文图拉的Femes山谷筑坝。从那时起，各种沉积物都储存在山谷中。在山谷中央，水平沉积了约50m的沉积物，包括以相当大的蒙脱石含量为特征的原地土壤、土壤沉积物、苔藓和青金石物质以及风成沉积物。大多数古石器来自非洲大陆。它们含有石英(粒度变化)和粘土矿物(高岭石和伊利石)，这些成分在岛上不存在，也不能在岛上形成。我们的目的是恢复女性谷的沉积历史，并通过沉积特征推断触发原因和控制因素。此外，我们的目标是通过介形码分析计算出环境随时间的变化。采用多重代理方法对超区域气候现象(海因里希事件或岁差引起的季风活动)是否以及在多大程度上对沉积历史和就地成土起主要作用这一问题进行了探讨。我们假设1.原位土壤形成(蒙皂石)反映了稳定的环境条件，与岛上更多的降水有关。海因里希事件可能与撒哈拉沙漠西北部源区的干燥条件有关，因此有利于巨大石英颗粒的尘埃供应。3.撒哈拉以南非洲地区由岁差引起的季风活动的变化导致地貌条件的变化(稳定/不稳定)，从而改变了高岭石含量和粉质石英颗粒的沉积物供应。

About 1000 ka ago a volcano dammed the valley of Femes situated in Fuerteventura (Canary Islands). Since then all kind of sediments are stored in the valley. In the center of the valley about 50m of sediments are horizontally deposited consisting of in situ soils, characterized by a considerable smectite content, of soil sediments, of tephra and lapilli material as well as of eolian sediments. Most of the eolianites come from the African continent. They contain quartz (in changing grain sizes) and clay minerals (kaolinite and illite), components that are not existent on the island and cannot be formed on it. We aim to reconstruct the sedimentation history of the valley of Femes, and by means of sediment characteristics deduce triggering causes and controlling factors. Furthermore we aim to work out environmental changes through time by means of ostracode analyses. A multiproxy-approach is used to contribute to the question, if and to what extend supra-regional climate phenomena (Heinrich events or precession caused Monsoon activity) are playing a major role in respect to the sedimentation history and to in situ soil formation. We assume that 1. in situ soil formation (smectite) reflect stable environmental conditions linked to more precipitation on the island.2. Heinrich events could be related to dryer conditions in the northwest Saharan source area and thus favor dust supply with giant quartz grains. 3. changing monsoon activity triggered by precession in sub-Saharan Africa resulted in changing landscape conditions (stable/instable) and thus to changing sediment supply in respect to kaolinite content and silty quartz grains.