Untersuchungen zur Entwicklung der vorzeitlichen Morphodynamik im Tibesti-Gebirge (Zentralsahara) und in Tunesien ; Arbeit aus der Forschungsstation Bardai/Tibesti
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Media type:
E-Book
Title:
Untersuchungen zur Entwicklung der vorzeitlichen Morphodynamik im Tibesti-Gebirge (Zentralsahara) und in Tunesien ; Arbeit aus der Forschungsstation Bardai/Tibesti
Contributor:
Molle, Hans-Georg
[Author]
imprint:
Im Selbstverl. des Instit. für Physische Geographie der Freien Universität Berlin, Berlin, 1979
Footnote:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Description:
Research results are presented from two areas: the Tibesti Mountains (Central Sahara) and Tunisia. In the first study area geomorphological and sedimentological methods were used to reconstruct the origin of two depressions. The valley and 510pe sediments were classified and investigated for Climatic evidence. The reconstructed formation process of these two depressions can be compared with geomorphological development in other parts of the Tibesti. In addition, comparison may be possible with results by P. ROGNON (1967) in the Atakor borderland in the Hoggar Mountains. The upper terrace accumulation phase („Oberterrassen-Akkmnulation“) in the Tibesti probably corresponds to the sedimentation of the „terrasse graveleuse" in the Atakor borderland. Further possibilities of comparison are indicated: both for the older formation process preceding the upper terrace accumulation (e. g. for the period of origin of river systems and erosion surfaces at the time of basin formation, or for periods of lacustrine sedimentation) and for the younger formation process following the upper terrace accumulation (e. g. for the following periods: the accumulation of early Holocene lacustrine deposits, the development of soils formed on top of these sediments‚ the formation of a younger fine material terrace and of the recent valley sediments). Climatic influences seem to have had a similar effect on formation processes in both mountain ranges. The second part of the study deals with research results from various areas in Tunisia concerning the different phases of erosion and accumulation and of soil formation during the upper Pleistocene and Holocene, the results were compared with finds from other parts of Tunisia and the northern borderland of the Sahara. Development seems to have been parallel during some periods, e. g. the period of relatively intense morphodynamic activity with the deposition of debris and gravel during the upper Pleistocene. the soil formation phase about 6000—4700 B. P.‚ and the accumulation period about ...