| Autor: |
Barbara Mauz, Noureddine Elmejdoub, Roger Nathan, Younes Jedoui |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Palaeogeography, Palaeoclimatology, Palaeoecology. 279:137-146 |
| ISSN: |
0031-0182 |
| Popis: |
The coast of Tunisia stretches from the western Mediterranean climate belt in the north to the Saharan desert climate belt in the south. The sediments of this coastal strip provide a record of sea level change if an accurate chronology of the coastal deposits is available. We have here surveyed and analysed coastal sites and established a chronology based on optical dating techniques. The optical ages range from 156 ka to 62 ka (2σ level) and cluster around the last interglacial period (~ 125–75 ka). Our study shows that sea level rose after Termination II for about 25 ka leading to a transgressive deposit at ~ 120 ka. A disconformity shown by some deposits suggests a brief drop of sea level during this transgressional phase. Subsequently, for around 40 ka the coastal area became covered by soils, colluvia and aeolian sediments indicating a slowly falling sea level. While the composition of sediments at the north coast did not change, the deposits at the central and south coast experienced a drastic change from a quartz- to a carbonate-dominated sedimentation sometime during the last interglacial. Littoral sedimentation ceased at ~ 70 ka when the coast became sediment starved in the course of the falling sea level. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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