Mass Transport Deposits and geo-hazard assessment in the Bradano Foredeep (Southern Apennines, Ionian Sea)

Seafloor bathymetry, combined with multi-scale seismic reflection profiles, were used to describe the morphostructural setting of the Bradano Foredeep (Gulf of Taranto, northern Ionian Sea), where a submerged portion of the Southern Apennines is facing the Apulia Platform in the Calabrian Arc convergent margin. In this complex area, marine geophysical data highlight the presence of two mega-slide deposits at the shelf-slope transition, which are most likely the largest ever described in the region. These slid masses, named the Bradano Basento MegaSlide (BBMS) and Bradano Basento MegaSlide 1 (BBMS1), form a Mass Transport Deposit Complex (MTDC) affecting and eroding the topmost portion of the outer Apennines deformation front and the Apulian Foreland Ramp. It was emplaced in late Pleistocene times inside the narrow (about 10 km wide) Bradano Foredeep basin, a Plio-Pleistocene submarine trough developing at the chain front. The youngest of these deposits (BBMS1) likely predates the Last Glacial Maximum. Location of the MTDC within the subduction complex suggests that active tectonics and seismic shaking might represent the main triggering mechanisms for gravitative instability in this area, although gravitational tectonics and sediment creeping mechanisms cannot be excluded. On the other hand, size and distribution of the MTDC in the sedimentary record of the Bradano Foredeep suggest the need of re-evaluating the potential for large earthquakes/tsunamis, and more in general geological hazard related to submarine sliding masses, along the coast of this highly populated area

Mass transport deposits and geo-hazard assessment in the Bradano Foredeep (Southern Apennines, Ionian Sea)

Seafloor bathymetry, combined with multi-scale seismic reflection profiles, were used todescribe the morphostructural setting of the Bradano Foredeep (Gulf of Taranto,northern Ionian Sea), where a submerged portion of the Southern Apennines isfacing the Apulia Platform in the Calabrian Arc convergent margin. In thiscomplex area, marine geophysical data highlight the presence of two mega-slidedeposits at the shelf-slope transition, which are most likely the largest everdescribed in the region. These slid masses, named the Bradano Basento MegaSlide(BBMS) and Bradano Basento MegaSlide 1 (BBMS1), form a Mass Transport DepositComplex (MTDC) affecting and eroding the topmost portion of the outer Apenninesdeformation front and the Apulian Foreland Ramp. It was emplaced in latePleistocene times inside the narrow (about 10 km wide) Bradano Foredeep basin,a Plio- Pleistocene submarine trough developing at the chain front. The youngestof these deposits (BBMS1) likely predates the Last Glacial Maximum. Location ofthe MTDC within the subduction complex suggests that active tectonics andseismic shaking might represent the main triggering mechanisms for gravitativeinstability in this area, although gravitational tectonics and sedimentcreeping mechanisms cannot be excluded. On the other hand, size anddistribution of the MTDC in the sedimentary record of the Bradano Foredeepsuggest the need of re-evaluating the potential for large earthquakes/tsunamis,and more in general geological hazard related to submarine sliding masses,along the coast of this highly populated area

Platelet activation supports the development of venous thrombosis in hyperlipidemic rats

This investigation sought to determine how different components of the hemostatic system affect the development of venous thrombosis in rats displaying hyperlipidemia, either on a genetic basis or secondary to metabolic disorders. On employing an experimental model of collagen-triggered venous thrombosis, both spontaneously hyperlipidemic (Yoshida strain) and streptozotocin-induced diabetic rats generated about 2.3-fold greater thrombi than normolipidemic controls. This was associated with significant platelet activation, as revealed by increased levels of serum thromboxane B-2 in diabetics (1.5-fold) as well as in Yoshida (8-fold) rats, in comparison with controls. In contrast, ex vivo total fibrinolytic activity, as measured by euglobulin lysis time, did not differ between normo-and hyperlipidemic or diabetic animals. Plasminogen activator inhibitor activity was lower in both Yoshida and diabetic rats than in controls. However, tissue-type plasminogen activator activity was differently affected by the genetic or the diabetes-related hyperlipidemia, showing significantly lower values in Yoshida (-26%), but significantly higher values in diabetic rats (+29%) than in normolipidemic controls. We conclude that platelet activation, rather than consistent modifications of the fibrinolytic system, is likely to influence the enhanced thrombus development associated with primary or secondary forms of hyperlipidemia

Oblique plate collision and orogenic translation of the Southern Apennines revealed by post-Messinian interregional unconformities in the Bradano Basin (Ionian Sea - Central Mediterranean)

The Bradano Basin is a foreland basin along the Africa/Eurasia plate boundary. Due to its location and physiography, between Southern Apennines (SA) and Calabrian Arc (CA), it represents a natural recorder of Plio-Pleistocene tectonic processes. Integrated analysis of seismic reflection data, exploration well logs and seafloor bathymetry allowed us to unravel the basin architecture and the interplay between tectonics and sedimentation, providing stratigraphic and structural evidences on deep processes and shallow morpho-structural development. It results, that the post-Messinian tectonic evolution on this area is marked by two major tectonic events, whose effects are recorded in four sedimentary sequences bounded by interregional unconformities. During Pliocene times, an obliquely convergent margin led to collision between SA and CA, associated with shelf to deep marine turbiditic deposits. Around the Pliocene-Pleistocene boundary (2.58 Ma), a sudden and widespread rearrangement took place. The SA front, along with portions of the earlier obliquely collisional margin, started to move toward the NE, along progressively deeper detachments involving the lower Apulia plate. During this phase, a fast (3.8–8.3 cm/yr) ~50 km translation of the orogenic wedge was followed by uplift and slow-rate shortening (1.9 mm/year), associated with seafloor folding. This second phase is marked by deep marine deposits in the central part of the basin, and clinoforms in shallower western and northern sectors. Our data suggest that no oceanic crust is presently subducting below the Bradano Basin, although we cannot exclude that a narrow sliver of oceanic lithosphere was subducted before and/or during Pliocene times. The complex deformation pattern observed, represents the response to the interaction of (small-) plates, which is still active and important to be considered in neotectonics and paleoseismological reconstructions

The Plio-Pleistocene Bradano basin and the Southern Apennine Orogenic Wedge: evidences of accretion collision and segmentation of Apulian continental plate

The Pliocene-Pleistocene tectono-stratigraphic evolution of the Bradano Basin in the Gulf of Taranto is investigated by means of multi-scale, high-resolution seismic reflection profiles combined with exploration wells and seafloor bathymetry. Being located between the Ionian Calabrian Margin, to the West, and the Apulian Margin, to the East, the Bradano Basin is the site of pervasive tectonic deformations part of the southward and seaward prolongation of the Southern Apennines orogenic wedge. Within the Gulf of Taranto, five main domains surround the Bradano Basin: the Calabrian Arc, the Calabrian Accretionary Wedge, the Southern Apennines and the subducting Apulian Foreland Ramp. The external fronts of the Calabrian Accretionary Wedge and Southern Apennines progressively migrated toward ESE overriding and colliding with the subducting Apulian lithosphere during the Pliocene-Pleistocene. As previously recognized, this collisional setting has been responsible for the formation of the Pliocene-Pleistocene Bradano Foreland Basins System while the Apulian Foreland Ramp was uplifted and down-flexed toward west but generally considered as an “undeformed” foreland area. The multi-scale analyses of geophysical data reveals active deformation involving the foreland ramp which was affected by different tectonic phases: contraction and transcurrent deformations along E-W trending faults active from the Miocene to recent times; thrusts and thrust-related anticlines even underneath the Southern Apennine fronts; NW-SE and N-S striking thrust-related folds affecting the whole Apulian continental plate, likely inverting inherited Mesozoic-Pliocene extensional faults and gently folding the Pliocene-Recent deposits. Two main transcurrent systems have been recognized to segment the continental margin: the Amendolara Transpressive System and the new Apulian Transtensive System on the foreland ramp never described before this study. The above structures played a major role in the Bradano basin tectonic evolution during two main tectono-stratigraphic events. During middle-upper Pliocene, the Amendolara Transpressive System, a left-lateral strike-slip zone, segmented the Southern Apennine thrust fronts actively moving toward E onto the Apulian plate along a shallow detachment surface. At the end of this stage, the Southern Apennines frontal thrusts could thrust over the Pliocene Bradano Foredeep Basin as well as the underlying western portion of the Apulian Plate. The Apulian Transtensive System was active and, locally, extensional faults were inverted. During the second event (from Pleistocene to Present), the compressional deformations were localized at depths deeper than the subducted Bradano Foredeep Basin. Out-of-sequence thrusting reshaped the Southern Apennines orogenic wedge while, to the east, the Apulian Transpressive System and the inversion of extensional faults were still active. The proposed evolutionary model suggests that Bradano Basin, laying on top of the western margin of Apulian Plate, and the Apulian Foreland ramp are part of the Southern Apennines orogenic wedge whose outermost front can be located in the Apulian Foreland Ramp since Pliocene

RORSCHACH EN NIÑOS: UN ESTUDIO COMPARATIVO ENTRE POBLACIÓN MIGRADA Y NO MIGRADA

La presente comunicación se inscribe dentro de la inves-tigación: “Los efectos de la migración en las diferentes franjas etarias” (UBACyT 2011-2014), dirigid...This communication is part of the research: “The effects of migration on different age groups” (UBACyT 2011-2014), led by Prof. Alicia Martha Passalacqua.Pre..