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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sources of sulphur in gypsiferous sediments and crusts and pathways of gypsum redistribution in southern Tunisia
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Sources of sulphur in gypsiferous sediments and crusts and pathways of gypsum redistribution in southern Tunisia

机译：突尼斯南部石膏状沉积物和地壳中的硫源以及石膏的重新分布途径

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摘要

Southern Tunisia contains one of the most extensive gypsum accumulations in Africa comprising Triassic, Cretaceous, Eocene and Mio-Pliocene marine evaporites, spring deposits, playa sediments, aeolian sands and gypsum crusts. Sulphur isotope analysis (delta(34)S) of bedrock samples, groundwater, playa brines, playa sediments, and gypsiferous crusts provides insight into the sources of gypsum in the region and sheds light on the processes that lead to gypsum crust formation. Results Suggest that recycling of marine gypsum is the most likely source of the sulphate in the groundwater, playa sediments and crusts. The low PS values found in Eocene and Mio-Pliocene samples suggest that this recycling has been going on for millions of years. Though bedrock appears to be the ultimate source of the gypsum in the crusts, transport of this sulphate to playas, concentration therein, and subsequent dispersal across the landscape by aeolian processes provides the most likely pathway for surticial gypsum crust formation. Comparison of these results with those from Australia, Chile and Namibia suggests that, although the source of the sulphur varies from region to region, the processes of surficial crust formation appear to be similar. Copyright (C) 2004 John Wiley Sons, Ltd.
机译：突尼斯南部地区是非洲最广泛的石膏聚集地之一，包括三叠纪，白垩纪，始新世和上新世的海洋蒸发岩，春季沉积物，普拉亚沉积物，风沙和石膏结壳。基岩样品，地下水，普拉亚盐水，普拉亚沉积物和石膏硬皮的硫同位素分析（delta（34）S）提供了对该区域石膏来源的见识，并阐明了导致石膏硬皮形成的过程。结果表明，海洋石膏的再循环是地下水，普拉亚沉积物和硬皮中硫酸盐的最可能来源。在始新世和上新世的样品中发现较低的PS值表明这种回收已经进行了数百万年。尽管基岩似乎是地壳中石膏的最终来源，但这种硫酸盐向地transport的运输，浓度的集中以及随后通过风沙作用在整个景观中的扩散提供了表面石膏地壳形成的最可能途径。将这些结果与澳大利亚，智利和纳米比亚的结果进行比较表明，尽管硫的来源因地区而异，但表面结皮的形成过程似乎相似。版权所有（C）2004 John Wiley Sons，Ltd.

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