1,721,119 research outputs found
Middle-Upper Pliocene ‘compression’ and Middle Pleistocene ‘extention’ in the modelling of the East Tiber Basin (Central Italy): from ‘perched’ to ‘extentional basin in the Northern Apennines
No full textThe late Lower Pliocene Planation surface and mountain building of the Apennines (Italy)
No full textInvestigations on the nature, age and lateral relationships of the remnants of Italian planati on surfaces indicate that: 1) a single planation surface (PS) is recognisable across the Apennines along the inner part of the Italian Peninsula; 2) it was originally very flat; 3) it is better preserved on harder rocks and is not preserved on the higher relief because of major uplift and consequent dissection or glacial erosi on; 4) it cuts terrain ranging in age from Palaeozoic to early Lower Pliocene; 5) it planated the tectonic structures developed in earlier times; 6) it is at places buried under continental and marine deposits younger than late Lower Pliocene; 7) the PS was eroded in a much shorter time than is usually assumed; 8) the PS was modeled during the climatic amelioration that generated the Late Lower Pliocene transgression and largely corresponds to a plain of marine erosion; 9) after the end of Lower Pliocene it was uplifted and deformed by very limited re-activation of thrusts; 10) since the Lower Pleistocene it was displaced by high angle normal faults. [...
The southern east-Tiber Basin (Spoleto, Central Italy): geology and stratigraphy of the Plio-Pleistocene sediments
No full textFluvial architecture and dynamics in rising mountain chains and related basins; tectonic, climatic influence and human impact: The FLAG-SEQS (Fluvial Archive Group – Subcommission for European Quaternary Stratigraphy) Siena Meeting
No full textThe Last Interglacial Pedocomplexes in the litho- and morpho-stratigraphical framework of the Central-Northern Apennines (Central Italy)
No full textRecently in Italy, a great deal of effort has been devoted to the mapping of Quaternary continental deposits. Several Unconformity Bounded Stratigraphic Units (UBSU) have been defined. The unconformities indicate important phases of changing dynamics linked to Quaternary climatic changes, and have been related to valley downcutting simultaneous with paleosol formation during interglacials. However, glacial periods are characterised by deposition of thick continental sequences. We suggest that the UBSU's belonging to the late Middle Pleistocene (MIS 6) and Late Pleistocene can also be defined under a pedostratigraphic point of view. Locally at the top of the UBSU attributed to MIS 6, buried or relict paleosols are preserved. The paleosols developed in calcareous fluvial and moraine gravels with minor flints. The pedocomplexes are made of three paleosols separated by erosion surfaces and/or stonelines. The older paleosol (MIS 5e) is severely truncated and is characterised by a Ck horizon overlain by strongly leached reddish Bt horizons with flinty rock fragments (with a diagnostic wavy lower boundary). In some sites, subsequent secondary precipitation of carbonates transformed this horizon into a Btk. This paleosol is buried by a younger paleosol (MIS 5c) with less leached reddish Btk horizons, quartz of aeolian origin, and very small and scarce calcareous clasts. The main pedofeatures are associated with colluvial processes, biological activity, and carbonate precipitation. This paleosol is also truncated and buried under a similar paleosol (MIS 5a). Therefore, the lower paleosol of the pedocomplex can be attributed to the Eemian, and constitutes a valid marker for the definition and mapping of the underlying and overlying sedimentary units. In other parts of the Apennines, no sedimentary units have been found that correspond to the unconformities separating different pedostratigraphical units. In order to map the different UBSU's, due to the poor lateral continuity of the preserved paleosols, morpho- and litho-stratigraphical investigations and correlation are always recommended. (c) 2006 Elsevier Ltd and INQUA. All rights reserved
Guado San Nicola acheulean site: preliminary remarks on the litho-, morpho- and pedo-stratigraphical setting
No full textGeolitologia. Note illustrative della Carta della Vegetazione del Foglio Nocera Umbra n° 312 – Carta d’Italia I.G.M. - scala 1: 50.000.
No full textGeolitologia: assetto strutturale e geologia, elementi geomorfologici e cenni pedologici sui paleosuoli fersiallitici
No full textIn: E. Orsomando e A.Catorci - Note Illustrative della Carta della Vegetazione del Foglio 312 Nocera Umbra. Braun Blanquetia, Camerino
Automatic identification of sites prone to topographic seismic amplification effects by the current seismic codes
Full text linkCurrent seismic codes provide proxies to estimate seismic amplification effects expected in correspondence of some morphological features. To make possible any empirical validation of these proxies, these features must be univocally identified on the basis of an automatic procedure. To this purpose, based on geomorphological considerations, a GIS-based numerical approach has been developed. The results of a morphometric analysis allowed the correct identification and mapping of the landforms of concern, at a detail corresponding to the resolution of the available digital elevation model (DEM). Some case-studies are provided to show the feasibility of the proposed approach. © 2023 The Author
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