magnetic study of the heated and unheated sedimentary fillings of sebkha mhabeul, southeast tunisia: a geophysical method for paleoclimatic investigation and tephrochronological dating
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2014
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Abstract
This paper is meant to investigate the climatic and volcanic signals within the sedimentary filling of sebkha Mhabeul through a thermomagnetic study of a 37 cm length core. Values of the magnetic susceptibility at ambient temperature show that the core encompasses four climatic stages: the Warming Present (WP), the Little Ice Age (Late LIA), Early Little Ice Age (ELIA), and the Medieval Climate Anomalies (MCA). Added to the subcycles, the spectral analysis shows the individualization of an 888 yr cycle probably related to solar activity. The heating at 250°C is good-for-nothing since it was useful neither for climatic investigation nor for tephras layers detection. Heating at 700°C generated the complete loss of the climatic signal. On the other hand, it allowed the detection of the previously identified tephras layers. Further, it highlighted the presence of other tephras layers. The extraction by the bromoform confirms the presence of these tephras. The use of the same methodology may allow the detection of tephras layers within other sebkhas.
| Reference Key |
essefi2014internationalmagnetic
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| Authors | ;Elhoucine Essefi;Samir Mefteh;Mounir Medhioub;Chokri Yaich |
| Journal | organometallics |
| Year | 2014 |
| DOI |
10.1155/2014/908395
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