Die Erdfälle von Layla und Al-Kharj – Einblicke in die Karst-Hydrogeologie des oberen Jura von Saudi-Arabien

Schleusener, Florian; Kempe, S.; Dirks, Heiko; Rausch, Randolf; Göbel, Patricia

doi:10.1007/s00767-013-0235-3

Cited by 4 publications

(1 citation statement)

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“…Layla Lakes in the Interior Homocline of Saudi Arabia are large sinkholes restricted to a spring area and related to hypogene dissolution of anhydrite in the Arab and Hith formations by upward transverse flows derived from the underlying limestone aquifer. These lakes that used to be fed by sulphate-rich springs have been drained by groundwater overexploitation, exposing dramatic gypsum precipitates on their walls (Kempe and Dirks, 2008;Schleusener et al, 2013).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Sinkholes in hypogene versus epigene karst systems, illustrated with the hypogene gypsum karst of the Sant Miquel de Campmajor Valley, NE Spain

et al. 2019

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The Garrotxa-Banyoles artesian aquifer system in NE Spain includes zones with epigene and hypogene evaporite karst and sinkhole development. The sinkhole fields related to hypogene evaporite dissolution are associated with the discharge zones of the aquifer, where groundwater from a confined limestone rises traversing an overlying gypsum formation capped by thick marls. This work analyses the sinkhole field developed in the Sant Miquel de Campmajor Valley (SMCV), a discharge area of the aquifer, where a cartographic inventory including 94 sinkholes has been produced. Sinkholes in this hypogene gypsum karst are mainly large caprock-collapse sinkholes rooted in deep-seated cavities generated by interstratal hypogene karstification, as corroborated by an electrical resistivity imaging (ERI) survey. They show a nonclustered distribution within the sinkhole field and the variations in size and density across the area are mainly controlled by the thickness of the marl caprock. The magnitude and frequency relationships of the sinkholes can be modelled with a high goodness of fit with a log-normal function, like in other regions of the world. However, in this deep-seated hypogene system the depressions show much larger dimensions. ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P TPotential differences between the sinkholes developed in hypogene and epigene karst environments are discussed, including their distribution with respect to the groundwater flow system, their spatial patterns and dimensions.

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Section: Accepted Manuscriptmentioning

confidence: 99%