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Holocene slope dynamics in Sierra Nevada (south Spain). Sedimentological analysis of solifluction landforms and lake deposits

By
M. Oliva
M. Oliva
1
Institute of Geography and Territorial Planning, University of Lisbon, Alameda da Universidade, 1600-214 Lisbon, Portugal
3
Landscape Research and Mediterranean Mountain Palaeoenvironments Research Group, University of Barcelona
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A. Gómez Ortiz
A. Gómez Ortiz
2
Department for Physical and Regional Geography, University of Barcelona, Montalegre 6-8, 08001 Barcelona, Spain
3
Landscape Research and Mediterranean Mountain Palaeoenvironments Research Group, University of Barcelona
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Published:
January 01, 2011

Abstract

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.

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Geological Society Special Publication

Ice-Marginal and Periglacial Processes and Sediments

I. P. Martini
I. P. Martini
University of Guelph, Canada
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H. M. French
H. M. French
University of Guelph, Canada
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A. PéRez Alberti
A. PéRez Alberti
Universidade de Santiago de Compostela, Spain
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Geological Society of London
Volume
354
ISBN electronic:
9781862396029
Publication date:
January 01, 2011

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