Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf
The integrated analysis of high-resolution multibeam bathymetry and single-channel seismic profiles around Salina Island allowed us to characterize the stratigraphic architecture of the insular shelf. The shelf is formed by a gently-sloping erosive surface carved on the volcanic bedrock, mostly cove...
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MDPI AG
2018-01-01
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| Series: | Geosciences |
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| Online Access: | http://www.mdpi.com/2076-3263/8/1/20 |
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| author | Daniele Casalbore Claudia Romagnoli Chiara Adami Alessandro Bosman Francesco Falese Alessandro Ricchi Francesco Latino Chiocci |
| author_facet | Daniele Casalbore Claudia Romagnoli Chiara Adami Alessandro Bosman Francesco Falese Alessandro Ricchi Francesco Latino Chiocci |
| author_sort | Daniele Casalbore |
| collection | DOAJ |
| description | The integrated analysis of high-resolution multibeam bathymetry and single-channel seismic profiles around Salina Island allowed us to characterize the stratigraphic architecture of the insular shelf. The shelf is formed by a gently-sloping erosive surface carved on the volcanic bedrock, mostly covered by sediments organized in a suite of terraced bodies, i.e. submarine depositional terraces. Based on their position on the shelf, depth range of their edge and inner geometry, different orders of terraces can be distinguished. The shallowest terrace (near-shore terrace) is a sedimentary prograding wedge, whose formation can be associated to the downward transport of sediments from the surf zone and shoreface during stormy conditions. According to the range depth of the terrace edge (i.e., 10–25 m, compatible with the estimated present-day, local storm-wave base level in the central and western Mediterranean), the formation of this wedge can be attributed to the present-day highstand. By assuming a similar genesis for the deeper terraces, mid-shelf terraces having the edge at depths of 40–50 m and 70–80 m can be attributed to the late and early stages of the Post-LGM transgression, respectively. Finally, the deepest terrace (shelf-edge terrace) has the edge at depths of 130–160 m, being thus referable to the lowstand occurred at ca. 20 ka. Based on the variability of edge depth in the different sectors, we also show how lowstand terraces can be used to provide insights on the recent vertical movements that affected Salina edifice in the last 20 ka, highlighting more generally their possible use for neo-tectonic studies elsewhere. Moreover, being these terraces associated to different paleo-sea levels, they can be used to constrain the relative age of the different erosive stages affecting shallow-water sectors. |
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| language | English |
| last_indexed | 2024-04-13T11:59:19Z |
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| series | Geosciences |
| spelling | doaj.art-94f23cf68cd74c038cc7f1521e8ac3ae2022-12-22T02:47:49ZengMDPI AGGeosciences2076-32632018-01-01812010.3390/geosciences8010020geosciences8010020Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular ShelfDaniele Casalbore0Claudia Romagnoli1Chiara Adami2Alessandro Bosman3Francesco Falese4Alessandro Ricchi5Francesco Latino Chiocci6Dipartimento Scienze della Terra, Sapienza Università di Roma, 00 185 Roma, ItalyDipartimento di Scienze Biologiche, Geologiche ed Ambientali, Università di Bologna, 3340 126 Bologna, ItalyIstituto di Geologia Ambientale e Geoingegneria, Consiglio Nazionale delle Ricerche, 00 185 Roma, ItalyIstituto di Geologia Ambientale e Geoingegneria, Consiglio Nazionale delle Ricerche, 00 185 Roma, ItalyIstituto di Geologia Ambientale e Geoingegneria, Consiglio Nazionale delle Ricerche, 00 185 Roma, ItalyDipartimento di Scienze Biologiche, Geologiche ed Ambientali, Università di Bologna, 3340 126 Bologna, ItalyDipartimento Scienze della Terra, Sapienza Università di Roma, 00 185 Roma, ItalyThe integrated analysis of high-resolution multibeam bathymetry and single-channel seismic profiles around Salina Island allowed us to characterize the stratigraphic architecture of the insular shelf. The shelf is formed by a gently-sloping erosive surface carved on the volcanic bedrock, mostly covered by sediments organized in a suite of terraced bodies, i.e. submarine depositional terraces. Based on their position on the shelf, depth range of their edge and inner geometry, different orders of terraces can be distinguished. The shallowest terrace (near-shore terrace) is a sedimentary prograding wedge, whose formation can be associated to the downward transport of sediments from the surf zone and shoreface during stormy conditions. According to the range depth of the terrace edge (i.e., 10–25 m, compatible with the estimated present-day, local storm-wave base level in the central and western Mediterranean), the formation of this wedge can be attributed to the present-day highstand. By assuming a similar genesis for the deeper terraces, mid-shelf terraces having the edge at depths of 40–50 m and 70–80 m can be attributed to the late and early stages of the Post-LGM transgression, respectively. Finally, the deepest terrace (shelf-edge terrace) has the edge at depths of 130–160 m, being thus referable to the lowstand occurred at ca. 20 ka. Based on the variability of edge depth in the different sectors, we also show how lowstand terraces can be used to provide insights on the recent vertical movements that affected Salina edifice in the last 20 ka, highlighting more generally their possible use for neo-tectonic studies elsewhere. Moreover, being these terraces associated to different paleo-sea levels, they can be used to constrain the relative age of the different erosive stages affecting shallow-water sectors.http://www.mdpi.com/2076-3263/8/1/20prograding wedgescoastal areaspaleo sea-levelinsular shelfvolcanic islandsmultibeam bathymetry |
| spellingShingle | Daniele Casalbore Claudia Romagnoli Chiara Adami Alessandro Bosman Francesco Falese Alessandro Ricchi Francesco Latino Chiocci Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf Geosciences prograding wedges coastal areas paleo sea-level insular shelf volcanic islands multibeam bathymetry |
| title | Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf |
| title_full | Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf |
| title_fullStr | Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf |
| title_full_unstemmed | Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf |
| title_short | Submarine Depositional Terraces at Salina Island (Southern Tyrrhenian Sea) and Implications on the Late-Quaternary Evolution of the Insular Shelf |
| title_sort | submarine depositional terraces at salina island southern tyrrhenian sea and implications on the late quaternary evolution of the insular shelf |
| topic | prograding wedges coastal areas paleo sea-level insular shelf volcanic islands multibeam bathymetry |
| url | http://www.mdpi.com/2076-3263/8/1/20 |
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