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Meccariello, Melania
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Meccariello, Melania
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- PublicationRestrictedNew insights on the tectonics of the Lampedusa Plateau from the integration of offshore, onland and space geodetic data(2017)
; ; ; ; ; ; ; Joint analysis of multichannel seismic reflection profiles calibrated with well-logs across the northern part of the Lampedusa Plateau (central sector of the Pelagian Block, Sicily Channel), of structural data collected on Lampedusa island, and of GNSS geodetic velocities of sites on the islands and on the northern shore of the Channel, suggests that this part of the plateau forms an anticlinorium (Lampedusa Plateau Anticlinorium, LPA). The LPA developed during Paleogene to Early Miocene intraplate contraction followed by Miocene to current strike-slip deformation. It is formed by WNW-ESE striking highs and lows, which have an ~20 km average wavelength and culminate at the Lampione-Lampedusa High. These broad folds are bounded by high-angle faults with a reverse component of displacement, which cut Eocene to Lower Pliocene strata offshore, and Late Miocene strata on Lampedusa. Extensional faults, that have a bathymetric expression and are responsible for marked stratal tilting due to their listric geometry, are only found to the NE of the island and are associated to the rifting that affected the central part of the Sicily Channel in the Pliocene-Quaternary. Seismic reflection profiles show that normal fault activity peaked during the middle part of the Pliocene and strongly diminished afterward. Appraisal of recent plate motion reconstructions and of published and new structural data offshore and on-land suggest that the main growth phase of the LPA occurred during (Late Cretaceous?) Paleocene-Early Miocene ~N-S convergence between Nubia and Eurasia and associated intraplate shortening. Starting from Early Miocene, likely in response to a CCW rotation of the plate convergence direction, strike-slip deformation occurred with a ~NW-SE shortening axis and ~NE-SW extension axis. During this time span the previous contractional structures were locally reactivated in transpression. The two different strain regimes, extensional and transpressional that established since Miocene NE and W to NW of Lampedusa, respectively, still persist today as documented by geodetic velocities.125 2 - PublicationOpen AccessMulti-temporal tectonic evolution of Capo Granitola and Sciacca foreland transcurrent faults (Sicily channel)(2019-08-20)
; ; ; ; ; ; ; ; ; Joint analysis of high-penetration multi-channel and high-resolution single-channel seismic reflection profiles, calibrated by deep well boreholes, allowed a detailed reconstruction of the Late Miocene to Recent tectonic history of the Capo Granitola and Sciacca fault systems offshore southwestern Sicily. These two fault arrays are part of a regional system of transcurrent faults that dissect the foreland block in front of the Neogene Sicilian fold and thrust belt. The Capo Granitola and Sciacca faults are thought to reactivate inherited Mesozoic to Miocene normal faults developed on the northern continental margin of Africa. During Latest Miocene-Pliocene, the two ~NNE-SSW striking faults were active in left transpression, which inverted Late Miocene extensional half-grabens and created push-up ridges along both systems. Tectonic activity decreased during the Pleistocene, but transpressional folds deform Middle-Late Pleistocene sediments as well, suggesting that the two fault systems are active. The ~40 km long longitudinal amplitude profile of 1st order folds (Capo Granitola and Sciacca anticlines) shows ~15–20 km bell-shaped undulations that represents 2nd order folds. The length of these undulations together with the map pattern of faults allowed to divide the CGFS and SFS into two segments, northern and southern, respectively. Total uplift of the Sciacca Anticline is twice than the uplift of the Capo Granitola Anticline. Incremental fold growth rates decreased during time from 0.22 mm/yr (Capo Granitola Anticline) and 0.44 mm/yr (Sciacca Anticline) in the Pliocene, to 0.07 and 0.22 mm/yr, respectively, during the last ~1.8 Ma.66 79