Subsidenz und tektonik des Saar-Nahe-Beckens (SW-Deutschland) |
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| Authors: | Andreas Henk |
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| Institution: | (1) Institut für Geologie der Universität Würzburg, Pleicherwall 1, W-8700 Würzburg, Deutschland |
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| Abstract: | The Saar-Nahe-Basin in SW-Germany is one of the largest Permo-Carboniferous basins in the internal zone of the Variscides. Its evolution is closely related to movements along the Hunsrück Boundary Fault, which separates the Rhenohercynian and the Saxothuringian zones. Recent deep seismic surveys indicate that the Saar-Nahe-Basin formed in the hanging wall of a major detachment which soles out at lower crustal levels at about 16 km depth. Oblique extension along an inverted Variscan thrust resulted in the formation of a half-graben, within more than 8 km of entirely continental strata accumulated. The structural style within the basin is characterized by normal faults parallel to the basin axis and orthogonal transfer fault zones. Balanced cross-section construction and subsidence analysis indicate extension of the orogenically thickened lithosphere by 35%. Subsidence modeling shows discontinuous depth-dependent extension with laterally varying extension factors for crust and mantle lithosphere. Thus, the offset between maximum rift and thermal subsidence can be explained by a zone of mantle extension shifted laterally with respect to the zone of maximum crustal extension. |
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| Keywords: | Saar-Nahe-Basin half-graben cross-section balancing subsidence analysis Permo-Carboniferous basin formation |
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