Palaeosols in Saharan and Sahelian dunes of Chad: archives of Holocene North African climate changes

B. Mauz; P. Felix-Henningsen

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Palaeosols in Saharan and Sahelian dunes of Chad: archives of Holocene North African climate changes

机译：乍得撒哈拉沙漠和萨赫勒沙丘的古土壤：北非全新世气候变化档案

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Limnic sediments and palaeosols are frequently present in dunes of the Sahara and Sahel deserts of Chad. This study focused on genesis and degree of development of the palaeosols and the timing of soil formation. The soils are Cambic Arenosols formed by precipitation-induced silicate weathering and leaching. The upper parts of the Cambic Arenosols are indurated due to accumulation of salt and amorphous silica during a drier climate following soil formation. The optical age data reveal the occurrence of one or two distinct short-lived humid climate intervals shortly after ～5 ka and before ～2.5 ka and the formation of local desert lakes shortly after ～5 ka. The study further suggests that rapid climate changes occurred mainly in the mid-Holocene whereas the early-Holocene humid period lasted longer.

机译：乍得的撒哈拉沙漠和萨赫勒沙漠的沙丘中经常存在石灰岩沉积物和古土壤。这项研究的重点是古土壤的成因和发育程度以及土壤形成的时间。土壤是由降水引起的硅酸盐风化和浸出形成的坎比贝气溶胶。由于土壤形成后的干燥气候中盐和无定形硅石的积累，使得坎比克气溶胶的上部被硬化。光学年龄数据揭示了在〜5 ka之后和〜2.5 ka之前不久有一个或两个不同的短时潮湿气候间隔的发生，以及在〜5 ka之后不久的局部沙漠湖的形成。该研究进一步表明，快速的气候变化主要发生在全新世中期，而全新世初期的湿润时期持续的时间更长。

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来源
《The holocene》 |2005年第3期|p.453-458|共6页
作者
B. Mauz; P. Felix-Henningsen;
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作者单位

Department of Geography, University of Liverpool, Liverpool L69 7ZT, UK;

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原文格式 PDF
正文语种 eng
中图分类天文学、地球科学;
关键词
north africa; holocene; humid climate periods; palaeosols; optical dating; sahara; sahel; chad;

机译：北部;全新世;潮湿的气候时期;古土壤;光学测年;撒哈拉沙漠;萨赫勒;乍得;

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Palaeosols in Saharan and Sahelian dunes of Chad: archives of Holocene North African climate changes

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