1,721,151 research outputs found
Stratigraphy and evolution of a long-lived fluvial system in the southeastern Alps (NE Italy): the Tagliamento conglomerate.
No full textThe Tagliamento River, located in the eastern Southern Alps, represents a unique opportunity to study the evolution of this sector
of the chain over the last 6 Ma because of its relatively well preserved deposits. The development of the fluvial system has been
reconstructed for the period since the Messinian, when the valley was deeply carved and uphead eroded, and the drainage basin
was widened. The deposits preserved along or close to the present valley have been subdivided into five allostratigraphic units on
the basis of bounding unconformities, supported also by petrographic (pebble and sandstone) data, facies and structural analysis.
The units are characterized by different composition and sources, permitting a reconstruction of the changes in the drainage areas.
The angular unconformities that bound the units as well as the deformations affecting the deposits indicate that the eastern Southalpine
Chain has been tectonically since the Messinian
Integral evaluation in the Bem solution of (hyper)singular integral equations. 2D problems on polygonal domains.
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The Pleistocene activity of the eastern Southalpine chain unravelled by the terraced staircase of the Meduna valley (NE Italy)
No full textThe results of stratigraphic and morphotectonic analyses made on the Pleistocene terraces at the outlet of the Meduna valley (eastern Carnic Prealps) are presented and discussed. The investigated area belongs to the front of the eastern Southalpine chain that hit destructive earthquakes both historical and instrumental. Structural framework of the front of the Southalpine chain is made by a set of WNW-ESE striking, SSE-verging medium to low-angle thrusts gradually propagating in the Friulian Plain. In the study area, located south of the Periadriatic thrust, the main structural elements are the WSW-ENE striking Maniago and M. Jouf thrusts. East of Meduno locality, this structural framework shows a noticeable undulation, probably reflecting a Cretaceous or Eocene paleostructure and causing a NW-SE striking dextral transpressive transfer zone. Both thrusts show evidence of Quaternary activity. Nine depositional units Early Pleistocene - Holocene in age and six terraced orders are detected. Stratigraphic and geometric relationships between depositional units and terraced surfaces allowed to reconstruct the chronology of the depositional events. The study confirms a Quaternary activity for the Maniago and M. Jouf faults. In particular the Maniago thrust shows an upper Pleistocene - Holocene uplift rate of about 1.1 mm/y. © Società Geologica Italiana, Roma 2013
Neotectonic evidence of the Plio-Pleistocene activity of the eastern Southalpine thrust front in western Friuli
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