E. Bozzo
University of Genoa
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Featured researches published by E. Bozzo.
Tectonophysics | 2002
Fausto Ferraccioli; E. Bozzo; Detlef Damaske
Abstract Aeromagnetic signatures over the Edward VII Peninsula (E7) provide new insight into the largely ice-covered and unexplored eastern flank of the Ross Sea Rift (RSR). Positive anomalies, 10–40 km in wavelength and with amplitudes ranging from 50 to 500 nT could reveal buried Late Devonian(?)–Early Carboniferous Ford Granodiorite plutons. This is suggested by similar magnetic signature over exposed, coeval Admiralty Intrusives of the Transantarctic Mountains (TAM). Geochemical data from mid-Cretaceous Byrd Coast Granite, contact metamorphic effects on Swanson Formation and hornblende-bearing granitoid dredge samples strengthen this magnetic interpretation, making alternative explanations less probable. These magnetic anomalies over formerly adjacent TAM and western Marie Byrd Land (wMBL) terranes resemble signatures typically observed over magnetite-rich magmatic arc plutons. Shorter wavelength (5 km) 150 nT anomalies could speculatively mark mid-Cretaceous mafic dikes of the E7, similar to those exposed over the adjacent Ford Ranges. Anomalies with amplitudes of 100–360 nT over the Sulzberger Bay and at the margin of the Sulzberger Ice Shelf likely reveal mafic Late Cenozoic(?) volcanic rocks emplaced along linear rift fabric trends. Buried volcanic rock at the margin of the interpreted half-graben-like “Sulzberger Ice Shelf Block” is modelled in the Kizer Island area. The volcanic rock is marked by a coincident positive Bouguer gravity anomaly. Late Cenozoic volcanic rocks over the TAM, in the RSR, and beneath the West Antarctic Ice Sheet exhibit comparable magnetic anomaly signature reflecting regional West Antarctic Rift fabric. Interpreted mafic magmatism of the E7 is likely related to mid-Cretaceous and Late Cenozoic regional crustal extension and possible mantle plume activity over wMBL. Magnetic lineaments of the E7 are enhanced in maximum horizontal gradient of pseudo-gravity, vertical derivative and 3D Euler Deconvolution maps. Apparent vertical offsets in magnetic basement at the location of the lineaments and spatially associated mafic dikes and volcanic rocks result from 2.5D magnetic modelling. A rift-related fault origin for the magnetic lineaments, segmenting the E7 region into horst and graben blocks, is proposed by comparison with offshore seismic reflection, marine gravity, on-land gravity, radio-echo sounding, apatite fission track data and structural geology. The NNW magnetic lineament, which we interpret to mark the eastern RSR shoulder, forms the western margin of the “Alexandra Mountains horst”. This fundamental aeromagnetic feature lies on strike with the Colbeck Trough, a prominent NNW half-graben linked to Late Cretaceous(?) and Cenozoic(?) faulting in the eastern RSR. East–west and north–north–east to NE magnetic trends are also imaged. Magnetic trends, if interpreted as reflecting the signature of rift-related normal faults, would imply N–S to NE crustal extension followed by later northwest–southeast directed extension. NW–SE extension would be compatible with Cenozoic(?) oblique RSR rifting. Previous structural data from the Ford Ranges have, however, been interpreted to indicate that both Cretaceous and Cenozoic extensions were N–S to NE–SW directed.
Geological Society, London, Special Publications | 2003
Fausto Ferraccioli; E. Bozzo
Abstract Tectonic modelling of regional aeromagnetic anomaly patterns suggests Cenozoic right-lateral strike-slip faulting along an inherited fault system of the Transantarctic Mountains and adjacent hinterland. We name it here the Prince Albert Fault System. The Reeves Fault and David Fault are Cenozoic right-lateral strike-slip faults and form part of the NW-SE-striking segment of this complex fault system, extending to the eastern margin of the Wilkes Subglacial Basin. Our aeromagnetic interpretation suggests therefore that the Wilkes Subglacial Basin may be connected to the Cenozoic strike-slip kinematic framework of the Transantarctic Mountains and western Ross Sea Rift. The southernmost segment of the Prince Albert Fault System parallels the N-S-striking McMurdo Sound Fault Zone and, together with it, defines a transtensional western Ross Sea Rift margin. High-resolution aeromagnetic images define the Cape Roberts pull-apart basin and suggest that Cenozoic magmatism may have focused along the transtensional western Ross Sea Rift margin itself.
Geophysics | 2009
Andrea Zunino; F Benvenuto; E. Armadillo; M. Bertero; E. Bozzo
In archaeological magnetic prospecting, most targets can be modeled by a single layer of constant burial depth and thickness. With this assumption, recovery of the magnetization distribution of the buried layer from magnetic surface measurements is a 2D deconvolution problem. Because this problem is ill posed, it requires regularization techniques to be solved. In analogy with image reconstruction, the solution showing the resolved subsoil features can be considered a focused version of the blurred and noisy magnetic image. Exploiting image deconvolution tools, two iterative reconstruction methods are applied to minimize the least-squares functional: the standard projected Landweber method and a proposed modification of the iterative space reconstruction algorithm. Different regularization functionals inject a priori information in the optimization problem, and the split-gradient method modifies the algorithms. Numerical simulations in the case of perfect knowledge of the impulse response functions demonstrate that the edge-preserving, total-variation functionals give the best results. An iterative semiblind deconvolution method to estimate the burial depth of the source layer was used with a real data set to test the effectiveness of the method.
Tectonophysics | 1992
E. Bozzo; S. Campi; Giovanni Capponi; G. Giglia
Abstract A ground magnetic survey was carried out over a wide area of northwestern Italy, including western and central Liguria, the southeastern Piedmont and a part of the Ligurian Sea. Several cross-sections, cutting the main structural elements (the Ligurian Sea, the Ligurian Alps, the Monferrato Hills) have been performed and magnetic models have been developed. The interpretation of the most characteristic cross-section (A1-NNW), is presented in this paper. A model involving the presence of a major suture between the Ligurian Alps and the Monferrato Hills fits the positive magnetic anomaly running from the surroundings of Turin towards Asti. This model implies that slabs of upper mantle or lower continental crust were trapped in the suture, as in the internal zone of the Western Alps, where the Ivrea body comes in contact at depth with the Pennidic nappes. To the south, this suture line does not appear throughout the Ligurian Sea, probably owing to the recent crustal thinning, which is revealed by both the magnetic and the gravimetric features.
Geophysical Research Letters | 2004
E. Armadillo; Fausto Ferraccioli; G. Tabellario; E. Bozzo
A Geomagnetic Depth Sounding profile was performed across the glaciated Rennick Graben and the adjacent fault-bounded terranes of northern Victoria Land in East Antarctica. Induction arrows analysis and a 2D inversion model provide a unique deep electrical resistivity window beneath these fault zones. The electrical resistivity break across the Lanterman Fault is apparently restricted to the upper crust, suggesting that this strike-slip fault may not represent a deep lithospheric suture. Further east, a westward-dipping conductor is traced to a depth of 40 km beneath the Robertson Bay Terrane. It may image a remnant of the paleo-Pacific oceanic plate, which subducted beneath the Bowers Terrane. Within the Wilson Terrane, the Rennick Graben is an upper-crust resistive block. The Rennick Graben lacks a deep crustal or upper mantle conductor, in contrast to several continental rifts. However, similar resistive lower crust underlies some other major strike-slip fault belts.
Geophysical Research Letters | 2018
Alexander Golynsky; Fausto Ferraccioli; Jongkuk Hong; Dmitry Golynsky; R. R. B. von Frese; Duncan A. Young; D. D. Blankenship; J. W. Holt; Sergey Ivanov; A.V. Kiselev; Valery N. Masolov; Graeme Eagles; Karsten Gohl; Wilfried Jokat; Detlef Damaske; Carol A. Finn; Alan Aitken; Robin E. Bell; E. Armadillo; Tom A. Jordan; Jamin S. Greenbaum; E. Bozzo; G. Caneva; René Forsberg; Marta E. Ghidella; Jesús Galindo-Zaldívar; Fernando Bohoyo; Y. M. Martos; Y. Nogi; E. Quartini
The second generation Antarctic magnetic anomaly compilation for the region south of 60°S includes some 3.5 million line‐km of aeromagnetic and marine magnetic data that more than doubles the initial maps near‐surface database. For the new compilation, the magnetic data sets were corrected for the International Geomagnetic Reference Field, diurnal effects, and high‐frequency errors and leveled, gridded, and stitched together. The new magnetic data further constrain the crustal architecture and geological evolution of the Antarctic Peninsula and the West Antarctic Rift System in West Antarctica, as well as Dronning Maud Land, the Gamburtsev Subglacial Mountains, the Prince Charles Mountains, Princess Elizabeth Land, and Wilkes Land in East Antarctica and the circumjacent oceanic margins. Overall, the magnetic anomaly compilation helps unify disparate regional geologic and geophysical studies by providing new constraints on major tectonic and magmatic processes that affected the Antarctic from Precambrian to Cenozoic times.
Tectonophysics | 1985
E. Bozzo; Claudio Eva; V. Pasquale
Abstract Geomagnetic effects related to the stresses induced by the water load of the Chiotas reservoir (NW Italy) were studied, with measurements of the geomagnetic field at different stages of filling. The highest effect, mean 7 nT, was recorded at three-quarters full; subsequently, as the volume of water increased, the anomalous variations fell to about 2 nT.
Tectonophysics | 2009
Fausto Ferraccioli; E. Armadillo; Tom A. Jordan; E. Bozzo; Hugh F. J. Corr
Geophysical Prospecting | 1998
Fausto Ferraccioli; Marco Gambetta; E. Bozzo
Geophysical Research Letters | 2002
Fausto Ferraccioli; E. Bozzo; G. Capponi