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Architecture and dynamics of a Triassic/Jurassic carbonate platform-basin transition in the Sciacca area, South Central Sicily: implications for the Neogene accretion of the Maghrebian orogen

Cacciatore M., Di Stefano P.

Volumina Jurassica

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2006

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Vol. 4, no. 1

81-82

EN

The Sciacca area, in Southwestern Sicily, belongs to the external zone of the Neogene Maghrebian thrust and fold belt. Two different groups of south-verging thrust sheets crop out in this area: the so called "Saccense" units that consist of thick Mesocenozoic neritic and pelagic platform carbonates; the "Sicanian" units made of Permian to Cenozoic deeper-water sediments. The tectonic boundary between Saccense and Sicanian units runs NW-SE from Monte Genuardo to Caltabellotta. This boundary is orthogonal to the main thrust fronts and nearly parallel to the direction of thrust propagation. Thrust-top-basin deposits of Pliocene age obscure the tectonic relationships along this alignment leaving different solutions open for its structural interpretation and for the palinspastic restorations between platform and basin-derived units. Recent sedimentological and stratigraphical studies focused in this zone document the presence of Upper Triassic reef limestones in the Saccense units (Pizzo Telegrafo unit), close to the tectonic alignment. The macro and microfacies analysis reveal a typical Dachstein-type reef composition of these deposits. As consequence they can be interpreted as markers of platform edges facing high-energy, open marine basins. The collected data are thus consistent with the presence of a Late Triassic platform-basin transition close to the present-day tectonic boundary. An intense Jurassic paleotectonic activity along this margin is proved by in situ brecciation and the presence of large polyphase neptunian dykes crosscutting the reef deposits and the overlying Lower Jurassic platform limestones (Inici Formation). The dykes are filled up by Middle to Upper Jurassic Rosso Ammonitico type condensed limestones. Basaltic pillow lavas occur as thick wedges intercalated to the Jurassic pelagic limestones. They indicate repeated episodes of (trans)tensional stresses along the paleomargin. An anomalous thin Cretaceous to Miocene sedimentary cover (Scaglia type calcilutites and glauconitic sandstones) is punctuated by deep erosional truncations and megabreccias. These sediments fill up later generations of neptunian dykes confirming the paleotectonic activity in this zone throughout the Jurassic-Miocene times. In the Sicanian basinal units flanking the tectonic alignment the influence of the platform paleomargin is recorded by extensive Lower Jurassic carbonate aprons interbedded to cherty calcilutites. Upper Triassic reef-derived elements are common constituents of these clastics as recently documented at Campofiorito and Monte Triona. Looking at the present day structural relationships in the studied area we can conclude that the Triassic/Jurassic paleomargin has played an important role as major transpressional dextral escape during the Neogene Sicanian mountain building.

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The Aquitanian marine deposits in the basement of Polish Western Carpathgians and its palaeogeogrraphical and palaeotectonic implications

Oszczypko N., Oszczypko-Clowes M.

Acta Geologica Polonica

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2003

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Vol. 53, nr 2

101-122

EN

Early Miocene mudstones and conglomerates were discovered in the Andrychów 6 borehole, beneath the Polish Western Carpathians. These dark grey mudstones contain calcareous nannoplankton belonging to the Aquitanian NN1 zone, which can be correlated with the Egerian Stage of the Central Paratethys. The marine mudstones are underlain by conglomerates and sandy-silty deposits of Oligocene age, which overlapped the Early Palaeozoic-Precambrian platform basement. The conglomerates display features of fan delta deposits, and were supplied with material derived from erosion of the uplifted part of platform basement (Cieszyn-Slavkov Ridge). The Egerian mudstones from the Andrychów 6 borehole, and the Eggenburgian Zebrzydowice Formation known from the Karvina and Cieszyn area, reflect a progressive flooding of the European Platform during the Egerian/Eggenburgian transgression. The Egerian-Oligocene mudstones and conglomerates, as well as the Zebrzydowice Formation are equivalents of the youngest flysch deposits in the Outer Carpathians. The Egerian deposits from the Andrychów area and the Eggenburgian Zebrzydowice Formation from the Cieszyn and Ostrava areas are relicts of a broad marine embayment which flooded southern Poland and linked terminal flysch basinand the adjacent European shelf. The sub-thrust Aquitanian (Egerian) to Langhian (Early Badenian) deposits in the Andrychów-Zawoja-Cieszyn area recorded a sedimentary-tectonic evolution of the southern edge of the European Platform. This time span covers the Egerian-Eggenburgian/Ottnangian marine deposition, the Late Ottnangian overthrust of the Outer Carpathians, the Karpatian alluvial fan deposition, uplift of the Cieszyn-Slavkov Ridge, the Late Karpatian-Early Badenian marine transgression and the subsequent Late Badenian to Sarmatian telescopic thrusting of the Outer Carpathians.

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Obserwowalność procesów triady: zmęczenie - pękanie - przemieszczanie skał

Kowalski W. C.

Przegląd Geologiczny

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2000

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Vol. 48, nr 3

259-262

PL

Wśród procesów wyróżniono: nieobserwowalne i obserwowalne, a wśród obserwowalnych: trudno-, średnio- i łatwo obserwowalne. Przechodzące w siebie procesy: zmęczenia skał, ich pękania i przemieszczania połączono w jedną triadę. Przedstawiono wyniki badań zmęczenia, pękania i przemieszczania skał w drugiej połowie XX w. w Polsce. Określono obserwowalność poszczególnych procesów badanej triady. Wskazano na wagę przedstawionych rozważań dla właściwego rozwiązania problemów geodynamiki współczesnej, paleodynamiki oraz tektoniki i paleotektoniki.

EN

There are distinguished among processes: inobserved and observed: hardly-, moderatly-, easily to distinguish. The transitive themselves processes: rock fatigue, rock fractures and rock displacements are jointed in one triad. There are presented results of studies in the rock fatigue, fracture and displacements in the second half of the XX Century in Poland. The observation of the particular processes in the studied triad is defined. Some consequences from the presented considerations for the proper solutions of the recently geodynamical, paleodynamical, tectonical andpaleotectonicalproblems were noticed.

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Paleotectonic criteria for location and prognosis of the phase state of hydrocarbon pools in the Boryslav-Pokuttia zone of the Carpathian Foredeep

Vul M. Y., Ladyzhensky G. M., Maksimova O. O.

Biuletyn Państwowego Instytutu Geologicznego

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1999

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nr 387

195--196