2015, Articolo in rivista
Del Bianco, Fabrizio; Gasperini, Luca; Angeletti, Lorenzo; Giglio, Federico; Bortoluzzi, Giovanni; Montagna, Paolo; Ravaioli, Mariangela; Kljajic, Zoran
The Montenegro/Northern Albania Continental Margin (MACM), in the eastern Adriatic Sea, is a convergent margin at the Dinarides Chain front supplied by major fluvial systems, such as the Buna/Bojana and Drini Rivers. Analysis of high-resolution seismic reflection profiles and core samples, which included paleobiologic legacy of macrofossil assemblages and radiometric dating, shows that the post Last Glacial Maximum (LGM) deposits are confined into mid-shelf basins partially bounded toward the sea by tectonic highs, such as the Kotor and Bar ridges, while the outer shelf exposes lowstand deposits locally covered by a thin veneer of Holocene mud. Pre-LGM units consist of four depositional sequences bounded by erosional surfaces of regional extent related to sea level lowstands during Marine Isotopic Stages (MIS) 10, 8, 6 and 2. This pattern is observed close to the shelf-break, at water depths of 200-220 m, where a stack of sedimentary sequences records sea level changes at the scale of 100 kyr. Position and estimated ages of buried shorelines indicate that the outer shelf subsidence rate has been about 1.12 mm/yr during the last similar to 350 kyr, while a morphological analysis carried out along the LGM paleoshoreline suggests that the northern sector of the MACM has been uplifted of up to several tens of meters during the last similar to 20 kyr. (C) 2014 Elsevier B.V. All rights reserved.
2014, Articolo in rivista, ENG
Schildgen, T. F.; Cosentino, D.; Cosentino, D.; Frijia, G.; Castorina, F.; Castorina, F.; Dudas, F. O.; Iadanza, A.; Sampalmieri, G.; Cipollari, P.; Cipollari, P.; Caruso, A.; Bowring, S. A.; Strecker, M. R.
Sr isotope records from marginal marine basins track the mixing between seawater and local continental runoff, potentially recording the effects of sea level, tectonic, and climate forcing in marine fossils and sediments. Our 110 new 87Sr/86Sr analyses on oyster and foraminifera samples from six late Miocene stratigraphic sections in southern Turkey, Crete, and Sicily show that 87Sr/86Sr fell below global seawater values in the basins several million years before the Messinian Salinity Crisis, coinciding with tectonic uplift and basin shallowing. 87Sr/86Sr from more centrally located basins (away from the Mediterranean coast) drop below global seawater values only during the Messinian Salinity Crisis. In addition to this general trend, 55 new 87Sr/86Sr analyses from the astronomically tuned Lower Evaporites in the central Apennines (Italy) allow us to explore the effect of glacio-eustatic sea level and precipitation changes on 87Sr/86Sr. Most variation in our data can be explained by changes in sea level, with greatest negative excursions from global seawater values occurring during relative sea level lowstands, which generally coincided with arid conditions in the Mediterranean realm. We suggest that this greater sensitivity to lowered sea level compared with higher runoff could relate to the inverse relationship between Sr concentration and river discharge. Variations in the residence time of groundwater within the karst terrain of the circum-Mediterranean region during arid and wet phases may help to explain the single (robust) occurrence of a negative excursion during a sea level highstand, but this explanation remains speculative without more detailed paleoclimatic data for the region.
2014, Presentazione, ENG
Pagliarulo R.
The presentation is a review of researches carried out in the last years about coastal stability relating to sea level changes.
2012, Articolo in rivista, ENG
Amato V. [1]; Aucelli P. [2]; D'Argenio B. [3]; Da Prato S. [4]; Ferraro L. [3]; Pappone G.[2]; Petrosino P. [5]; Rosskopf C. [1]; Russo Ermolli E. [6]
The Sele river plain is located along the western Tyrrhenian margin of the southern Apennine Chain and is confined seaward by a straight sandy coast formed during the Last Interglacial and the Holocene. The coastal plain is characterised by beach-dune ridges which interfinger landwards with lagoon and fluvio-palustrine deposits. This belt, which progressively grew up, represents the evolution of a barrier-lagoon system alternatively shifting landwards and seawards. The knowledge on the Holocene evolution of the Sele river coastal plain, along the coast of the Poseidonia-Paestum archaeological area, was improved by the drilling of two new cores and the collection of several archaeo-tephro-stratigraphic data. The area experienced the Holocene marine transgression which cut high cliffs in the travertine deposits. During the second half of the Holocene, the shoreline shifted seawards and a lagoon-beach bar system (Fossa Lupata-Laura) formed. The archaeological remains (VI cent. b.c.) and the Agnano Monte Spina tephra layer (4.1 ky BP) constrain chronologically this morpho-sedimentary system. After the VI cent. b.c., and mostly after the deposition of the 79 a.d. tephra layer, the shoreline shifted seawards and an additional beach ridge formed, while the flat area at the back (Fossa Lupata) was rapidly aggraded and dried up.
2004, Articolo in rivista, ITA
AGATE M.*, INFUSO S.**, LUCIDO M.*, MANCUSO M.*
High - resolution sequence stratigraphy tools have been applied to the study of the regressive shelfal deposits, found scattered off the Carini Embayment, a small sector of the northwestern Sicily continental margin. Such sedimentary successions, whose development is related to the Late Pleistocene eustatic fluctuations, have been widely recognised off several Mediterranean continental selve. In the Carini Embayment, these prograding wedges represent the stratigraphic record of subsequent sea level falls and lowerings. Terraced features, characterizing the outer shelf, reflect the late constructive stage of the sea level lowering and the first erosive stages of the subsequent rise, when the top of the shelf margin units was cut off by shoreline landward shift and accompanying wave action. Purpose of this papers is to describe the internal geometries and areal extension of the regressive sedimentary succession of the Carini Embayment in order to derive their geological history during the Last Glacial Maximum.
2003, Articolo in rivista
Cagatay M.N.(1), .Görür N.(2), Polonia A.(3), Demirbag E.(1), Sakinç M.(1) , Cormier M.H.(4), Capotondi L. (3), McHugh C(4), Emre O.(5), Eris K. (1)
Offshore and onshore stratigraphic studies, together with high-resolution shallow seismic reflection profiling and multibeam bathymetric mapping, were carried out in the western and central part of the Izmit Gulf. These studies indicate that the Izmit Gulf was a lacustrine environment as part of the Marmara lake during the late glaciation and early deglaciation until ~12 kyr BP, when the Marmara basin was inundated by the Mediterranean waters. Correlation of 14C-dated onshore and offshore stratigraphic units in the western Izmit Gulf indicates that generally coarse late glacial sediments overlie a marked erosion surface formed during the low water level of the Marmara Lake. These coarse sediments are succeeded by 10.4-7 kyr BP old transgressive and by late Holocene post-transgression mud units. The bathymetry and subbottom chirp profiles clearly show that the palaeoshoreline of this lake was located at -85 m, having been controlled by the bedrock sill depth of the Çanakkale Strait. Another palaeoshoreline observed 65 m on northern margin of the Western Izmit and Karamürsel basins was probably formed during the Younger Dryas sea-level stillstand. The shelf areas during about this time were colonized by bioherms, which were subsequently drowned and disappeared after further rise of the sea level. The presence of a 65 m marine paleoshoreline in the Karamürsel basin indicate that the sill restricting this basin to the west was much deeper than its present 55 m level and placed further south. The Gölcük basin restricted by a 38 m sill to its west, was probably not flooded by marine waters until ~9 kyr BP.
2002, Articolo in rivista, ENG
De Rita, Donatella; Fabbri, Marina; Mazzini, Ilaria; Paccara, Paolo; Sposato, Andrea; Trigari, Alessandra
The geometry and facies characteristics of volcaniclastic and marine sequences have been investigated in relation to synvolcanic and intervolcanic episodes and to Quaternary sea level changes, in an area of relative recent tectonic stability. The studied area is a coastal sector of northern Latium, where the products of three different Quarternary volcanoes reached the coast, during a period ranging between 0.45 and 0.1 Ma. The onshore sedimentation area includes lowland situated between pre-existing structural and volcanic constructional highlands with no clearly defined structural basin margins, called the Tuscania basin. Detailed stratigraphic field work has allowed analysis of lateral facies relationships between marine and volcaniclastic sediments, using volcanic horizons, mainly geochronologically dated, pyroclastic flow deposits. and fallout deposits as stratigraphical markets. The successions have been organized in Unconformity Bounded Stratigraphic Units, and the Synthems are bounded by primary order unconformities recognized throughout the continental area down to the coast. The stratigraphies have been compared with the oxygen isotope scale of Pisias et al. (Marine Geol. 59 (1994) 217). The analysis of the components and of the lithofacies of each Synthem has proven to be a powerful tool to correlate marine and volcano-sedimentary successions in areas affected by the interaction between volcanic activity and sea level changes. © 2002 Elsevier Science Ltd and INQUA. All rights reserved.