Palaeoclimate records from OIS 8.0-5.4 recorded in loess-palaeosol sequences on the Matmata Plateau, southern Tunisia, based on mineral magnetism and new luminescence dating


Dearing, J.A., Livingstone, I.P., Bateman, M.D. and White, K. (2001) Palaeoclimate records from OIS 8.0-5.4 recorded in loess-palaeosol sequences on the Matmata Plateau, southern Tunisia, based on mineral magnetism and new luminescence dating. Quaternary International, 76-77, 43-56. (doi:10.1016/S1040-6182(00)00088-4).

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Description/Abstract

Mineral magnetic studies of loess–palaeosol sequences on the Matmata Plateau, southern Tunisia, coupled with a new chronology based on luminescence dating, confirm the presence of at least four phases of pedogenesis during the period 100–250 ka. Inter-site correlations between the reddened fersiallitic palaeosols confirms that, despite modern gullying processes, the records are regional and repeatable. The palaeosol magnetic signal is controlled by the formation of secondary ferrimagnetic minerals, which may be easily detected by magnetic susceptibility and frequency-dependent susceptibility measurements. Comparison of the magnetic record with global proxy climate records shows a correlation with loess–palaeosol sequences in China and the marine oxygen isotope (OI) record during stages 8.0–5.4. Preliminary attempts to infer palaeoprecipitation levels from modern analogues of soil magnetism-climate associations suggests that during the periods 100–120 ka and ~ 200 ka precipitation was >400 mm a−1, compared with modern precipitation <150 mm a−1.

Item Type: Article
Additional Information: The first attempt to extract magnetic-based palaeoclimate signals from N. African loess (study funded by Royal Society and led by Dearing), and believed to be the only terrestrial palaeoclimate sequence from this period in the Mediterranean region. It overcame the previous difficulties of using radiocarbon dating through use of luminescence.
ISSNs: 1040-6182 (print)
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Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
Divisions: University Structure - Pre August 2011 > School of Geography > Environmental Processes and Change
ePrint ID: 46755
Date Deposited: 17 Jul 2007
Last Modified: 27 Mar 2014 18:30
Contact Email Address: j.dearing@liv.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/46755

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