Late-orogenic vertical movements within the arc of the SW Alps and Ligurian Alps |
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| Authors: | G Bertotti P Mosca |
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| Institution: | 1. Institute of General Ecology and Environmental Protection, Technische Universität Dresden, P.O. Box 1117, 01737 Tharandt, Germany;2. State Reservoir Administration of Saxony, Research Laboratory Paulsdorf, Talsperrenstraße 42, 01744 Dippoldiswalde, Germany;3. Institute of Soil Science and Site Ecology, Technische Universität Dresden, P.O. Box 1117, 01737 Tharandt, Germany;1. Collaborative Innovation Center of Deep Sea Biology and College of Life Sciences, Zhejiang University, Hangzhou 310058, PR China;2. Key Laboratory of Marine Ecosystem and Biogeochemistry, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, PR China;1. Earth-Life Science Institute, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152–8550, Japan;2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152–8550, Japan;3. Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153–8902, Japan;4. Department of Geology, The University of Leicester, Leicester LE1-7RH, UK;1. Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark;2. Dipartimento di Scienze della Terra, Universitá degli Studi di Milano, via Botticelli 23, 20133 Milano, Italy |
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| Abstract: | Mainly on the basis of seismic data, we reconstruct magnitude and timing of Miocene to Present vertical movements in the region of the Savigliano basin, an up to 4 km thick succession of Neogene to Quaternary sediments accumulated inside the Alpine arc at the western termination of the Po Plain. We focus, in particular, on the margins of the basin which are the link between the mountain range and the subsiding basin. Seismic data from these regions allow for the definition of upward and downward vertical movements (uplift-exhumation and subsidence) with a spatial and temporal resolution which cannot be attained by other methods. The eastern, southern and western margins of the Savigliano basin display very different geometries of the sedimentary bodies and, therefore, document different vertical movements during Miocene to Present times. The eastern part of the Savigliano basin, and the regions to the E, experienced subsidence followed by exhumation. The southern margin of the basin, in the Cuneo area, was much more stable with Miocene to present formations all pinching-out close to the present day outcropping position of the basement-sedimentary cover contact. In the W, seismic sections record a stage of tilting until the Burdigalian, followed by generalized subsidence which affected also the adjacent regions of the SW Alps. The overall pattern of vertical movements is essentially controlled by the NW-ward migration of a syncline–anticline couple with the synclinal axis presently located in the center of the Savigliano basin. The width of the folds is in the order of 30–60 km (1/2 wavelength). In map view, the trace of the fold axes changes from N–S in the Savigliano basin to E–W in the Alessandria basin. |
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