Search

Back‐arc basins (BABs) are associated with plate margins where crustal shortening, seafloor spreading, and volcanism coexist. The Vavilov basin (Tyrrhenian Sea) is a Pliocene BAB associated with the Apennine‐Tyrrhenian Sea subduction system and characterized by mantle exhumation. The NNE‐SSW elongated Vavilov seamount represents the easternmost and younger spreading ridge of the Vavilov basin. Here we present results of a morphological and magnetic study of the Vavilov seamount. Our results show that the seamount represents the last stage of the eastward asymmetric opening of the BAB. Its plumbing system consists of a dike swarm emplaced during the reversed Matuyama epoch and a younger shallow reservoir feeding the central and eastern sectors during the normal Brunhes epoch. This evolution is associated with the progressive loading of the edifice due to lava flow emplacement. The asymmetry of the seamount mirrors the asymmetric opening of the Vavilov back‐arc basin. Stretching of the crust, seafloor spreading, and volcanism occur in the overriding plate above roll‐backing slabs in subduction settings. The Vavilov basin (Tyrrhenian Sea) is a back‐arc associated with the eastward retreating of the Apennine‐Tyrrhenian Sea subduction system. The NNE‐SSW elongated Vavilov submarine volcano represents the easternmost and younger spreading center of this back‐arc basin. Combined morphological and magnetic studies of the Vavilov seamount show that the plumbing system of the seamount consists of an early sheet‐like intrusion system and a younger, central reservoir feeding the magmatism of the central and eastern sectors of the spreading ridge. This evolution is associated with the progressive growth of the edifice due to lava flow emplacement. The morphological and magnetic asymmetry of the seamount is due to the eastward, asymmetric opening of the Vavilov back‐arc basin. Magnetic inverse model images the multi‐level plumbing system of the spreading ridge of the Pliocene Vavilov back‐arc basinThe spreading ridge evolves from a fissural to a central‐type activityThe migration of volcanism in spreading ridges mirrors the asymmetric opening of back‐arc basins Magnetic inverse model images the multi‐level plumbing system of the spreading ridge of the Pliocene Vavilov back‐arc basin The spreading ridge evolves from a fissural to a central‐type activity The migration of volcanism in spreading ridges mirrors the asymmetric opening of back‐arc basins

In the recent years Additive Manufacturing (AM) methods, such as the Direct Metal Laser Melting (DMLM) technology, are getting more and more attractive and feasible for the realization of components and subcomponents of gas turbines. In particular, they are receiving much attention since, on the one hand, the manufacturing of complex 3D geometries is allowed and, on the other, manufacturing and delivery times can be cut down. Lately, Baker Hughes is studying the possibility to manufacture film-cooling holes via the DMLM technology in order to exploit the flexibility of such innovative manufacturing method and hence eliminate additional processes and lead time. From the open literature, it is known that additively manufactured holes can have a more irregular shape and higher roughness than traditional ones, which may lead not only to a reduction in coolant flow but more importantly to decay of the film-cooling adiabatic effectiveness. For this reason, a test campaign has been conducted in collaboration with the University of Florence (Italy) with the objective of characterizing the performance (minimum passage diameter, flow check, and adiabatic effectiveness) of AM versus traditional cylindrical holes on simple-geometry coupons built upon different construction angles. Ultimately, the dependency of AM holes performance on print angles is sought with the purpose of characterizing the impact of such manufacturing technology on film-cooling holes design.

Abstract This paper shows the results of a detailed reprocessing of aeromagnetic data, obtained by the downward projection to the seabed. The area of interest is centered over the Tyrrhenian Basin, whose bathymetric–topographic lay-out is characterized by a somewhat irregular trend. The origin of the intense depth variations depends on the Tyrrhenian structural setting, that is associated with the presence of several tectonic lineaments, seamounts or volcanic islands. The data were characterized by good quality and dense sampling, but they have been reprocessed in order either to solve some problems in the original compilation, and to reduce the distortion of the geomagnetic anomaly field caused by the difference of distance between the survey level and the magnetic source. The reprocessed magnetic map is proposed as an effective analysis tool for the Tyrrhenian area that is characterized by high susceptibility lithotypes. Downward projection of the aeromagnetic data by BTM algorithm increases the definition of the anomalous magnetic signal without distortions in the geometric pattern of the field, thus showing a more stable and effective association between the magnetic anomalies and their geological sources. This effect is particularly true for high frequency anomalies that are directly comparable after the topographic projection because the depth filtering effect is attenuated. Moreover, the BTM method has been applied for the first time to a regional scale survey that shows substantial advantages because no fictitious anomalies in the high frequency sector of the spectrum were generated. This has been a typical effect of the traditional downward projection methods widely used before. The final result is a BTM anomaly map that is able to show the structural connections between the geological magnetic sources of the Tyrrhenian Sea area.