Abstract
The Lessini Mountains on the southern margin of the Italian Southern Alps exhibit two Tertiary graben systems at an angle of about 40°. The NNW-trending system is orthogonal to the ENE-trending Tertiary extension direction. The NNE-trending system parallels the neighbouring Jurassic western margin of the Trento Platform and experienced sinistral transtension during the Paleogene. The interaction between the two normal fault trends defines a ca. 8 km long and 6 km wide rhomb-shaped structure containing igneous intrusions and dolomitized rock bodies, suggesting that the structure controlled syn-extensional fluid migration. At a smaller scale, fault segments of the NNE-trending set show two basic types of transfer zones, i.e. conjugate and synthetic. Due to the sinistral and normal oblique-slip on these faults, left steps of en échelon segments had a kinematics similar to that of pull-apart structures. The location of intrusion-centres within such transfer zones led to the collapse of the roof of the magma chambers and consequent deep basins development. In contrast, right-stepping synthetic en échelon normal-oblique fault segments developed relay ramps.
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