The Modino complex is a composite chaotic body, more than 400 m thick, extending for more than 50bkilometers. It is intercalated within the lower Miocene turbidite succession of the Northern Apennines. The sedimentary versus tectonic mechanism of emplacement of this body is still matter of debate. New field observations carried out along two transects - alongside the Mt. Modino and the Mt. Nuda slopes - led us to interpret the Modino complex as a large-scale, multi-story submarine landslide deposited onto the foredeep basin and, therefore, to consider it one of the largest fossil examples known in literature. A retrogressive slope failure seems to be the most reliable mechanism driving the emplacement of the masswasting deposit triggered by tectonic oversteepening, with instability beginning in the foredeep and subsequently propagating to the slope and the accretionary wedge front. The deposition of such slide reduced the accommodation space within the foredeep, thus forcing turbidite deposition in a more northeasterly position, i.e. shifting the depocentre toward the foreland. The original physiographic conditions were restored after leveling the topographic differences.

The role of large-scale sedimentary failure at the wedge front-foredeep boundary: a case study from the Northern Apennines, Italy.

PINI, GIAN ANDREA;
2006-01-01

Abstract

The Modino complex is a composite chaotic body, more than 400 m thick, extending for more than 50bkilometers. It is intercalated within the lower Miocene turbidite succession of the Northern Apennines. The sedimentary versus tectonic mechanism of emplacement of this body is still matter of debate. New field observations carried out along two transects - alongside the Mt. Modino and the Mt. Nuda slopes - led us to interpret the Modino complex as a large-scale, multi-story submarine landslide deposited onto the foredeep basin and, therefore, to consider it one of the largest fossil examples known in literature. A retrogressive slope failure seems to be the most reliable mechanism driving the emplacement of the masswasting deposit triggered by tectonic oversteepening, with instability beginning in the foredeep and subsequently propagating to the slope and the accretionary wedge front. The deposition of such slide reduced the accommodation space within the foredeep, thus forcing turbidite deposition in a more northeasterly position, i.e. shifting the depocentre toward the foreland. The original physiographic conditions were restored after leveling the topographic differences.
2006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2695833
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