Äolianit-Paläobodensequenzen auf Fuerteventura

Dominik Faust1, Tobias Willkommen1, Yurena Yanes2, Daniel Richter3, Ludwig Zöller3
1 Lehrstuhl Allgemeine Physische Geographie, TU Dresden
2 CSIC Granada
3 Lehrstuhl Geomorphologie, Uni Bayreuth

Invited Talk 2.10 in Löss und terrestrische Archive (Fortsetzung)

18.09.2012, 16:00-16:20, H8

The northern part of Fuerteventura is characterized by large dune fields. We investigated dune-paleosol-sequences in four pits to establish a robust stratigraphy. According to our results we propose a standard section for Northern Fuerteventura. An interaction of processes like dune formation, soil formation and redeposition of soils and sand are most important to understand the principles of landscape development in the study area. To our mind a process cycle seem to be important: First climbing-dunes are formed by sand of shelf origin. Then soil formation took place. Soil and sand were then eroded and deposited at toe slope position. This material in turn is the source of new sand supply and dune formation. The described cycle may be repeated several times and this ping-pong-process holds on.

Geochemical data and analyses of mollusc assemblages point to changing environments in space and even climate change in time. Finally our stratigraphical framework will be compared to nearby archives. One fundamental question still remains unanswered. Do we in deed need climate change to change process combinations (e.g. from dune formation to soil formation)? Assuming that different processes may happen under one climate, increasing soil forming intensity could be mainly a function of decreasing sand supply. This in turn could be caused by reduced sand production (q.v. Zech et al. accepted). Our talk on dune-paleosol-sequences are based on the results of two fieldtrips and geochemical analyses. The overall question refers to scientific exchange and discussions based on a concept proposed by Zech et al. (accepted).

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Letzte Änderung 26.07.2012