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Holocene slope dynamics in Sierra Nevada (south Spain): sedimentological analysis of solifluction landforms and lake deposits
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Autores
Orientador(es)
Resumo(s)
The activity of geomorphic processes in the current periglacial belt of Sierra Nevada
during the Holocene has been strongly controlled by climate variability. We examined two sedimentary
records showing several cycles with varying intensity of slope processes in the massif.
Chronostratigraphic studies of solifluction landforms have revealed seven cycles of enhanced
slope activity in Sierra Nevada during the last 7 ka. Lake sediments show eight periods with
increased slope activity over the last 6 ka. Depending on temperature and moisture regime,
erosion or conditions of slope stability prevailed. Cold and wet periods triggered slope processes
and favoured deposition of coarse-grained sediments into the lakes, whereas warm phases were
prone to soil development and fine-grained sedimentation in the lakes. The lake sediments also
show evidence for an increasing aridity trend since the Holocene Optimum Warm Period in
Sierra Nevada, which induced a shift of solifluction processes to higher elevations accompanying
late-lying snow patches.
Descrição
Palavras-chave
Halocene Sedimentological analysis Slope dynamics Lake deposits Sierra Nevada Spain
Contexto Educativo
Citação
Oliva, M., & Ortiz, A. G. (2011). Holocene slope dynamics in Sierra Nevada (south Spain): sedimentological analysis of solifluction landforms and lake deposits. Geological Society, 354(1), 227-239. https://doi.org/10.1144/SP354.15
Editora
The Geological Society of London