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. Lens-shaped slivers of Permian (Zechstein) amid Triassicunits appearing along the master fault of the Sontra Graben in centralGermany on the southern margin of the Central European Basin System (CEBS)were studied by means of detailed map analysis, a semi-quantitative forwardmodel, and two balanced cross sections. We show how partial reactivation ofthe graben's main normal fault and shortcut thrusting in the footwall duringinversion, combined with a specific fault geometry involving flats in low-shear-strength horizons, can produce the observed slivers of “exotic”Zechstein. This conceptual model implies that the Sontra Graben was createdby about 1200 m of extension followed by some 1000 m of contraction,resulting in the few hundred meters of net extension observed today. Gentledips and comparatively extensive exposure of some slivers suggest they arebackthrust onto the reactivated normal fault's hanging wall,an interpretation corroborated in one location by shallow drilling.Backthrusting appears to have wedged some Zechstein slivers into incompetentTriassic units of the hanging wall. Based on regional correlation, extensionmost likely occurred in Late Triassic to Early Cretaceous time, while thecontraction is almost certainly of Late Cretaceous age. The main aim of thispaper is to describe an uncommon structural feature that we interpret tooriginate from inversion tectonics in an evaporite-bearing succession withmultiple detachment horizons but without the presence of thick salt.

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Emplacement of “exotic” Zechstein slivers along the inverted Sontra Graben (northern Hessen, Germany): clues from balanced cross sections and geometrical forward modeling