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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4273

Authors: Cinti, F. R.*
Marra, F.*
Bozzano, F.*
Cara, F.*
Di Giulio, G.*
Boschi, E.*
Title: Chronostratigraphic study of the Grottaperfetta alluvial valley in the city of Rome (Italy): investigating possible interaction between sedimentary and tectonic processes
Title of journal: Annals of Geophysics
Series/Report no.: 5-6/51 (2008)
Publisher: INGV
Issue Date: Oct-2008
Keywords: Holocene stratigraphy
recent tectonics
Tiber valley
Rome
Abstract: We carried out geomorphologic and geological investigations in a south-eastern tributary valley of the Tiber River in Rome, the Grottaperfetta valley, aimed to reconstruct its buried geometry. Since results of the geomorphologic study evidenced anomalies of the stream beds, we performed geoelectric and boreholes prospecting to check whether recent faulting, rather than an inherited structural control, possibly contributed to the evolution of the alluvial valley. Vertical offsets of the stratigraphic horizons across adjacent boreholes were evidenced within the Late Pleistocene-Holocene alluvium and its substratum. In order to rule out the effects of irregular geometry of the alluvial deposits, we focussed on sectors where vertical offsets affected all the stratigraphic horizons (alluvium and pre-Holocene substratum), showing an increasing displacement with depth. We identified a site where repeated displacements occur coupled with a lateral variation of soil resistivity, and we drilled an oblique borehole aimed to cross and sample the possible fault zone affecting the terrain. A 7 cm thick granular layer, inclined 50°÷70° on the horizontal, was recovered 5 m b.g., and it was interpreted as the filling material of a fracture. The convergence of the reported features with independent evidence from geoelectric and geomorphologic investigations leads to hypothesize the presence of a faulting zone within the Holocene alluvial terrains and to propose the excavation of a trench to verify this hypothesis.
Appears in Collections:04.04.10. Stratigraphy
Annals of Geophysics
Papers Published / Papers in press

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