Search results for "Trias"
showing 10 items of 168 documents
On the origin of the southern Permian Basin, Central Europe.
2000
A detailed study of the structural and stratigraphic evolution of the Southern Permian Basin during latest Carboniferous to Early Jurassic times, supported by quantitative subsidence analyses and forward basin modelling for 25 wells, leads us to modify the conventional model for the Rotliegend-Zechstein development of this basin. The Late Permian-Early Jurassic tectonic subsidence curves are typical for a Permian to Early Triassic extensional stage that is followed by thermal subsidence. However, a purely extensional model is extremely problematic because active faulting during this time is 'minor' and generally hard to document. Using inverse techniques to model the subsidence curves, we q…
End Triassic karstification of a south Tethyan carbonate platform: the genesis of the “Libeccio Antico” a famous Baroque dimension stone.
2010
Record of the end-Triassic crisis in south-western Sicily: palaeoenvironmental changes reflected by the carbonate facies architecture.
2009
New biostratigraphic data from the Ladinian pelagic limestones of Pizzo di Sant’Otiero - Madonie Mountains, Sicily
2014
New biostratigraphic data, based on conodont investigations, were collected from the Ladinian limestones recently described at Sant’Otiero, a locality near the Village of Petralia Sottana in the Madonie Mountains (Central-Northern Sicily). At this locality a new calcareous succession lying at the base of a major tectonic unit of the Maghrebian chain is described. This succession consists of a lower massive part formed by a carbonate megabreccia, the elements of which are shallow water extraclasts with dasycladalean algae (Diplopora annulatissima Pia), benthic foraminifers, “Tubiphytes” and problematic organisms commonly described from Anisian carbonate platforms. Upward a well-bedded succes…
Acidification processes in a peritidal carbonate succession across the Triassic/Jurassic boundary (Sicily)
2017
For the first time, a correlation between biostratigraphic events and δ13C curve was attempted along an UpperTriassic-Lower Jurassic peritidal limestone succession cropping out in westernmost Sicily. The peritidal carbonates are organized in shallowing upward cycles characterized by subtidal skeletal mudstone to grainstone, intertidal microbial mats and supratidal paleosoils. About 300 meters of this succession covering the Triassic-Jurassic interval were studied in details. On the base of the macro- and microfossil assemblages from the subtidal facies, four informal units have been recognized along the studied section. Unit R1 (at the base, 111 m thick) is dominated by large megalodonts, r…
Triassic/Jurassic boundary in peritidal carbonates from western Tethys
2016
A carbonate platform from the western margin of the Ionian Tethys has been investigated for biotic and geochemical variations across the Triassic/Jurassic boundary (TJB). The section of Mount Sparagio (north-western Sicily) exposes a peritidal succession of Rhaetian-Hettangian age with a thickness of about 400 m. The peritidal sediments are organized in metre-scale shallowing upward cycles formed by subtidal, intertidal and supratidal facies. Along the section, the subtidal facies vary from bioturbated mud/wackestones with rare mollusc shells, to Megalodont-rich wacke/packstones to, more rarely, coral bafflestones, most likely as response to variations of the accommodation space and water e…
Dolomitization as an eventualdetermining factor in the colour alteration index (CAI)
1993
Abstract The Colour Alteration Index of conodonts (CAI) is indicative of the degree of alteration of organic material that exists in the interior of the conodonts. This CAI is used ordinarily in the determination of paleotemperatures. More frequent findings of abnormally high CAI values, equivalent to paleotemperatures that are not compatible with temperatures obtained by other more trustworthy methods, has taken us to use values not superior to 6 for the establishment of paleotemperatures. The CAI values measured in specimens proceding from dolostones in the Iberian Range (Spain) show in this way a certain degree of incompatibility with geological data. These anomalous values are the conse…
Pinna, Salvatore: Gavino Penducho Carta: ministro di Felipe IV. Truffe, tradimenti e omicide nella Madrid de los Austrias
2021
Bufones sobre lienzo. Nuevas miradas a la corte de los Austrias
2022
Esta tesis propone una regeneración bibliográfica e historiográfica de las representaciones pictóricas de enanos y bufones en el escenario de corte española de los Austrias durante los siglos XVI y XVII, con la voluntad de ofrecer hipótesis renovadas con que despejar parte de las profundas lagunas que envuelven estos peculiares retratos. Basándonos en un enfoque transversal y en el uso de nuevas herramientas metodológicas, atendemos a las inexploradas visualidad y recepción de estas imágenes y sus conexiones desde una perspectiva integradora que entrelaza las tradicionales investigaciones de la Historia del Arte con las miradas compartidas de la historia social y cultural de la corte, la im…