http://www.cnr.it/ontology/cnr/individuo/prodotto/ID180915
Tectonic vs. gravitational morphostructures in the central Eastern Alps (Italy): Constraints on the recent evolution of the mountain range (Articolo in rivista)
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- Tectonic vs. gravitational morphostructures in the central Eastern Alps (Italy): Constraints on the recent evolution of the mountain range (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.tecto.2009.02.019 (literal)
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- Agliardi F.; Zanchi A.; Crosta G.B. (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Federico Agliardi; Andrea Zanchi; Giovanni B. Crosta
Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza, 4, Milano 20126, Italy (literal)
- Titolo
- Tectonic vs. gravitational morphostructures in the central Eastern Alps (Italy): Constraints on the recent evolution of the mountain range (literal)
- Abstract
- Deep-seated gravitational slope deformations (DSGSDs) influence landscape development in tectonically
active mountain ranges. Nevertheless, the relationships among tectonics, DSGSDs, and topography are poorly
known. In this paper, the distribution of DSGSDs and their relationships with tectonic structures and active
processes, surface processes, and topography were investigated at different scales. Over 100 DSGSDs were
mapped in a 5000 km2 sector of the central Eastern Alps between the Valtellina, Engadine and Venosta
valleys. Detailed lineament mapping was carried out by photo-interpretation in a smaller area (about
750 km2) including the upper Valtellina and Val Venosta. Fault populations were also analysed in the field
and their mechanisms unravelled, allowing to identify different structural stages, the youngest being
consistent with the regional pattern of the ongoing crustal deformation. Finally, four DSGSD examples have
been investigated in detail by geological and 2D geomechanical modelling.
DSGSDs affect more than 10% of the study area, and mainly cluster in areas where anisotropic fractured rock
mass and high local relief occur. Their onset and development is subjected to a strong passive control by
mesoscopic and major tectonic features, including regional nappe boundaries as well as NW-SE, N-S and
NE-SW trending recent brittle structures. The kinematic consistency between these structures and the
pattern of seismicity suggests that active tectonics may force DSGSDs, although field evidence and numerical
models indicate slope debuttressing related to deglaciation as a primary triggering mechanism. (literal)
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