101 research outputs found
Eastern Adriatic magnetic anomaly: an evidence for a Thetian thinned crust
No full textThis paper deals with the intriguing and still not extensively treated evidence of an high amplitude, long wavelength magnetic anomaly covering a large area of the north-eastern – central Adriatic Sea (Croatian offshore, Fig. 1). The presence of intruded gabbroid rocks in the Croatian archipelago (Jabuka Island, Fig.1) represents an additional open question. A 2D geophysical model and the derived conceptual geological section will be presented as realized along two sections (the NW-SE Adria profile and the WSW-ENE L’Aquila-Sibenik profile) which cross cut the magnetic anomaly (Fig.1). The model has been carried out by integration of surface and geophysical data (many of them already published), the latter concerning magnetic and gravimetric anomalies, tomographic and heat flow data. These data have been merged in an integrated data-base by using the
MOVE software while geophysical modelling have been done using GM-SYS 4.7
Inner vs Outer wedge-top depozone “sequences” in the Late Miocene (late Tortonian – early Messinian) Sicilian Foreland Basin System; new data from the Terravecchia Formation of NW Sicily.
No full text“Inner” and “outer” wedge-top sequences in the Late Miocene Sicilian Foreland Basin System; inferences from the Upper Tortonian – Lower Messinian Terravecchia Fm. of NW Sicily
No full textDepositional architecture and geometric arrangement of Terravecchia Formation within the Scillato Basin (NW Sicily)
No full textThe Camporeale wedge-top basin (NW Sicily; Italy) in the frame of the Late Miocene Sicilian Foreland Basin System; inferences from the Upper Tortonian - Lower Messinian Terravecchia Formation
No full textTectonically-enhanced deposition in the Late Tortonian Scillato Basin (N Sicily): a sequence stratigraphic view
No full textUsing high-resolution stratigraphy and structural analysis to constrain a “polyphase” tectonics in wedge-top basins. Inferences from the Late Tortonian Scillato Basin (central-northern Sicily).
No full textThe present paper aims to show, both from a stratigraphic and structural points of view, the main features of
a wedge-top syntectonic basin which evolved recording polyphase and non-coaxial tectonics. The study area
is the Scillato Basin (SB), a roughly N–S-oriented structural depression located in the central-northern sector
of the Sicililian Maghrebides. There, an approximately 1300 m-thick upper Serravallian to upper Tortonian
succession of clastic units outcrops as a portion of the Neogene syntectonic covers of the Sicilian fold and
thrust belt. Within the outcropping succession the upper Tortonian Terravecchia Fm represents the main
topic of this paper. A multidisciplinary approach was carried out through an integration of sedimentology, facies,
stratal pattern and structural analyses; this was applied to the formation enabling one to recognize in
the Scillato Basin afining to coarsening upward succession, deposited recording an early transgressive and
a late regressive depositional stage. In our model these two main depositional stages developed and are directly
relatable to a two-step structural evolution of the basin. During thefirst step, a NW–SE-oriented structural
depression existed, enclosed between structural highs and accommodating the lower and middle
portion of the upper Tortonian succession. Subsequently, during the second step, the NW–SE depression
was non-coaxially deformed by superimposition of high-angle transpressive faults (many of which were
SE-dipping), developed in response to the upward propagation of structures enucleated at deeper structural
levels. This step was recorded in the basin by development of both depositional and structural interferences
recognizable along the upper portion of the Scillato Basin succession. A comparison betweenfield data and
deep geophysical data interpreted at the preliminary stage, raises questions about the late Miocene geological
evolution of this sector of the Sicilian chain, including: (i) the syn-tectonic deposition of the Terravecchia
Fm. in the Scillato Basin clearly recorded the interference of two main and non-coaxial tectonic events;
(ii) the younger of these two events has a clear tranpressional character and was active during the very
late Tortonian; (iii) as also indicated by many authors in neighboring orogenic wedges, the main control
on the location, geometry and depositional evolution of the Scillato wedge-top Basin was carried out by compressional
and transpressional structures developed at a deeper structural level. Their deformation propagated
upward both into the shallow structural level and sedimentary covers; therefore (iv) the late Miocene
structural scenario here depicted is not consistent either with the back-arc-related extension or with the
late orogenic gravitational collapse models previously invoked by other authors with regard to this sector
of the Sicilian thrust belt
Evidences of a polyphasic tectonics in a sedimentary basin developed above an orogenic belt; the Scillato Basin study case (N Sicily)
No full textOn the Calogero-Moser space associated with dihedral groups
No full textInternational audienceUsing the geometry of the associated Calogero-Moser space, R. Rouquier and the author have attached to any finite complex reflection group several notions (Calogero-Moser left, right or two-sided cells, Calogero-Moser cellular characters), completing the notion of Calogero-Moser families defined by Gordon. If moreover is a Coxeter group, they conjectured that these notions coincide with the analogous notions defined using the Hecke algebra by Kazhdan and Lusztig (or Lusztig in the unequal parameters case). In the present paper, we aim to investigate these conjectures whenever is a dihedral group
La “Dorsale di Camporeale” (Sicilia NW):significato strutturale nel contesto della tettonica deep-seated.
No full textThe “Camporeale Ridge” (NW Sicily): structural significance within deep-seated tectonics.
The “Camporeale Ridge” is a morphostructural element cropping out in NW Sicily. Detailed structural and stratigraphic analysis carried out in the study area allows us to reconstruct a main E-W-trending anticline partially exposed along the ridge. Its development is due to the action of high-angle transpressive faults which bound both northwards and southwards site of the ridge. Seismic reflection profile crossing the study area images a tectonic stack made up of carbonates rocks (Trapanese Units, TP) overlain a numidian flysch and Neogene terrigenous units along a low angle thrust plane. The profile images also that high angle faults affected the Trapanese Unit (TP) locally producing a back-verging younger structural high.
The tectonic strain associated to high angle faults, within the TP units, is transferred along the oldest thrust plane to the upper structural layers moving northward to the innermost sectors
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