Journal
GEODINAMICA ACTA
Volume 17, Issue 6, Pages 363-373Publisher
LAVOISIER
DOI: 10.3166/ga.17.363-373
Keywords
Mallorca; normal fault; inversion tectonics; detachment level; fold-and-thrust belt; shortening
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The Late Oligocene-Middle Miocene Mallorca fold-and-thrust belt is characterised by a large amount of shortening above a detachment horizon. A regional section of 50 kin in length across the island shows shortening of 80 km. Nevertheless, earlier normal faults play a significant role in compressive deformation. Two examples illustrating their role are presented: the first example is a fault-propagation-fold nucleated on a normal fault located in the fold core. We present a simple numerical model of this structure that illustrates how the observed complex structural and stratigraphic geometries might develop. The second example is a normal fault that interrupts the detachment level, giving rise to a step that results in a back-thrust system. (c) 2004 Lavoisier SAS. All rights reserved.
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