Jungquartäre Hangsedimente als Archive der Landschaftsgeschichte in der Colorado Front Range, U.S.A.

美国科罗拉多前锋山脉的亚高山至山地地带的特点是，具有丰富的层状斜坡沉积，其深度为1米，并且在各自的地层复合体中具有反复出现的沉积特征。除了Leopold等人的初始描述之外。(2008a)，到目前为止，还没有对它们的起源或年龄进行调查。首先，OSL测年尝试证明了测年方法在这方面的普遍适用性，并得出了40至12ka之间的最后一次冰川年龄。横跨从大陆分水岭以东的亚高山地带(Niwot Ridge的林线)到大平原(Boulder)交界处的山脚地带的一条东西向景观样带，研究了20条具有代表性的剖面在层结、沉积物特征和地貌动力学方面的水位差异。最值得注意的是，由于半干旱的气候条件，科罗拉多前锋山脉的山地地带缺乏可解释古气候的地理档案。此外，斜坡沉积物还为讨论末次盛冰期多年冻土线的位置提供了依据。因此，该项目为重建科罗拉多前锋山脉不同海拔地区的古环境和古气候提供了一种新的方法。

The subalpine to montane zones of the Colorado Front Range, U.S.A. are characterized by the abundance of stratified slope deposits exhibiting depths > 1 m and recurring sediment characteristics within the respective strata complexes. Apart from the initial description by Leopold et al. (2008a), they have not been investigated up to now in terms of either their genesis or age. First OSL dating attempts demonstrate the general applicability of the dating method in this context and render last glacial ages ranging between 40 and 12 ka. Across a landscape transect stretching W-E from the subalpine zone east of the Continental Divide (tree line at Niwot Ridge) to the zone of the Foot Hills at the border with the Great Plains (Boulder), 20 representative profiles are investigated with regards to hypsometric differences in stratification, sediment characteristics and morphodynamics. Most notably the montane zone of the Colorado Front Range is characterized by a lack of paleoclimatically interpretable geoarchives due to its semiarid climatic conditions. Additionally the slope sediments provide a basis for discussing the position of the permafrost line during the LGM. Therefore the project contributes a novel approach to the reconstruction of paleoenvironments and paleoclimates across the various altitudinal zones of the Colorado Front Range.