Direct response of small non-glaciated headwater catchments to Late Quaternary climate change: The Valle de la Fueva, southern Pyrenees
Direct response of small non-glaciated headwater catchments to Late Quaternary climate change: The Valle de la Fueva, southern Pyrenees
复制标题
小型非冰川源头流域对晚第四纪气候变化的直接响应:比利牛斯山脉南部的 Valle de la Fueva
DOI:
10.1016/j.geomorph.2018.06.008
复制
发表时间:
2018
期刊:
影响因子:
3.9
通讯作者:
Spiegel
中科院分区:
文献类型:
--
作者:
Stange;Midtkandal;Nystuen;Spiegel
Topographic depressions in mountain regions function as sediment traps and their morpho-sedimentary archives provide important insight into erosion and sediment dynamics in mountain ranges. In order to establish the (direct) drivers and timing of erosion phases in the southern central Pyrenees, small non-glaciated headwater catchments in the highly erodible Valle de la Fueva drainage basin were investigated as to their morphogenetic development.Geomorphic mapping revealed three morphogenetic complexes associated with the Valle de la Fueva drainage basin development: (i) high-lying talus plateaus and lateral slopes, (ii) extensive glacis and pedimentation surfaces, and (iii) deeply incised ravines with late-stage fluvial-cut terraces. The talus slopes are the oldest preserved geomorphic units of the Valle de la Fuevaand potentially denote the initial drainage basin topography. Talus bedrock and boulder exposure ages cluster yet between 21 and 4010Be-ka, indicating that the carbonate-dominated talus surfaces were rejuvenated during the last glacial cycle (MIS 4–MIS 2). The younger morphogenetic complexes (ii, iii) point to successive basin erosion stages from diffusive surface pedimentation under cold climate conditions (ii) to rapid linear fluvial dissection and late-stage terrace formation (iii). Denoting the abandonment of pediments as actively eroding surfaces,10Be depth profiles of glacis cover sediments yielded consistent late MIS 2 exposure ages. The abandoning of pediments marks the onset of rapid fluvial downcutting of deep ravines (iii) around the Holocene climate transition, which involved substantial sediment routing and basin scale erosion. Lower fluvial-cut terraces denote the termination of intense catchment erosion at around 14–8–10Be-ka and minor fluvial incision during Middle-Late Holocene.This research shows that small non-glaciated mountain catchments feature valuable high-resolution morpho-sedimentary archives that are useful for assessing the direct impact of major climate transitions on surface processes and landscape transformation in mountain regions. Improvements in quantifying the timing and rates of (paleo-) surface processes are vital for enhancing regional glaciofluvial chronologies and large-scale basin erosion models that are possibly afflicted with time-averaging biases.
登录
查看更多内容
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
G. Jalut;J. Martí;M. Fontugne;G. Delibrias;J. Vilaplana;R. Juliá
通讯作者:
R. Juliá
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
M. Calvet;Y. Gunnell
通讯作者:
Y. Gunnell
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
K. M. Stange;R. Balen;C. Kasse;J. Vandenberghe;J. Carcaillet
通讯作者:
J. Carcaillet
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
I. Midtkandal;J. Brun;R. Gabrielsen;R. Huismans
通讯作者:
R. Huismans
DOI:
10.1144/sp440.15
发表时间:
2017
期刊:
Special Publications
影响因子:
--
作者:
A. Mather;M. Stokes
通讯作者:
M. Stokes