Tettonica da inversione ed eredità strutturale nelle catene collisionali: un esempio dal sistema Alpi-Appennino

Translated title of the contribution: Inversion tectonics and structural inheritance in collision mountain belts: An example from the Alps-Apennine system

Enrico Tavarnelli*, Rob W H Butler, Mario Grasso

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The structure of continental lithosphere shows complex variety that is inherited into orogenic belts and influences the localization of contractional structures during mountain building. In the Alps- Apennine system the pre-orogenic template can include arrays of extensional faults. While in some areas of the outer orogenic zones these inherited features may simply reactivate under inversion, more commonly faults show complex, partial reactivation structures. In volumes of distributed strain, pre-orogenic faults may serve to nucleate large-scale buckle folds located along, or close to basementcover interfaces. These different patterns of basement reactivation may reflect spatially-varying strength-depth profiles in continental lithosphere that are themselves inherited from spatially-distinct geological histories. Even when not themselves reactivating, basement faults can control deformation in the overlying sedimentary cover by offsetting otherwise regionally-extensive detachment horizons. The 3D geometry of thrust systems can be strongly compartimentalized by pre-existing cross-faults, such as the oblique lineaments of the Apennines. A comparison between the outer, the intermediate and the inner orogenic zones, with examples from both the Alps and the Apennines, illustrates that the propensity for fault reactivation during mountain building depends on the rheological contrasts between the fault zone and surrounding rocks.

Original languageItalian
Pages (from-to)164-168
Number of pages5
JournalRendiconti Online Societa Geologica Italiana
Volume1
Issue number1
Publication statusPublished - 1 Dec 2008

ASJC Scopus subject areas

  • Geology

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