855 research outputs found
TUFFACEOUS DEPOSITS IN THE SEDIMENTARY COVER OF THE STRONA-CENERI ZONE AND IN THE VILLAFORTUNA-TRECATE OIL SYSTEM: PETROLOGICAL, GEOCHEMICAL AND GEOCHRONOLOGICAL CHARACTERIZATION
No full textIn the western sector of the Southern Alps, tuffaceous levels are occasionally found in Triassic sedimentary sequences and the age of the related magmatism is still matter of debate. The few available geochronological data on these tuffites (M. San Giorgio area, Lugano, CH) yield Triassic ages (245±1 Ma; U-Pb zircon [1]), which are slightly older than the stratigraphic position. The precise definition of the tuffite age is, however, important for the Triassic evolution of the western Alps. In particular, if the magmatism is synchronous with their stratigraphic position, tuffites might be linked to the Triassic magmatism documented by the Finero area (NE Ivrea-Verbano Zone [2]). However, it cannot be presently excluded that they are the product of erosion and re-deposition of the Permian acid volcanics located at the base of the Mesozoic sedimentary cover [3].In this work, we have considered the tuffaceous deposits occurring within a late Anisian-Ladinian succession in the Mesozoic sedimentary cover of the Strona-Ceneri Zone in the Borgosesia area [3,4] and the tuffites at the same stratigraphic position found in some wells of the Villafortuna-Trecate oil system field (western Po Plain, Piedmont region, NW Italy) [5]. These tuffaceous deposits are constituted by a variable mixture of magmatic and sedimentary components. Available chamical data on the magmatic component suggests a calc-alkaline affinity. Zircons have been separated with conventional methods from four samples, mounted in epoxy resin and characterised under cathodoluminescence (CL). Based on colour, morphology and internal structure, zircons have been divided in two populations. One group is constituted by light-pink coloured zircons with prismatic habits and tight osciscillatory zoning suggesting growth under magmatic conditions. Zircons from the second group are colourless, rounded in shape and with only relics of magmatic zoning. They most likely suffered metamorphic recrystallization.Ongoing ELA-ICP-MS characterizations of both trace elements composition and U-Pb age of these zircons is expected to provide valuable constraints on the geodynamic evolution of the Southern Alps Domain in Permo-Triassic times.References. [1] Mundil, R., Brack, P., Meier, M., Rieber, H., Oberli, F. (1996): Earth and Planetary Science Letters, 141, 137-151; [2] Peressini, G., Mazzucchelli, M., Rivalenti, G., Hofmann, A.W. (2004): Geophysical Research Abstracts, 6, 05072, SRef-ID: 1607-7962/gra/EGU04-A-05072; [3] Carraro, F., Fiora, L. (1974): Riv. It. Paleont. Strat., 80, 167-191; [4] Fantoni, R., Decarlis, A., Fantoni, E. (2004): Atti Tic. Sc. Terra, 44, 97-110; [5] Fantoni, R., Bello, M., Ronchi, P., Scotti, P. (2002): Extended Abstracts Book EAGE Conference Florence
What remains of Yugoslavia? From the geopolitical space of Yugoslavia to the virtual space of the Web Yugosphere
No full textThe article works from the double hypothesis that: (1) a Yugoslav socio-cultural space still exists in spite of the dissolution of the former Socialist Federal Republic of Yugoslavia; (2) the communities ‘occupying’ this space can be considered, in some measure, ‘diasporic’, if the ‘Yugoslav diaspora’ is defined by not only the geographic displacement of people but also by the loosening of the connections between the members of an ex-nation who still consider themselves a national community. The ‘space’ mapped in the essay is the so-called ‘virtual space’ of the Web, including all websites that reconnect to the ‘cultural languages’ of the ‘past-country’. The author observes how these ‘different Yugoslavias’ are ‘staged’ and linked together on the Web, and verifies how some far-flung communities rally around the ‘virtual re-foundation’ and ‘virtual representations’ of Yugoslavia. The corpus is constituted mainly of ‘yugonostalgic’ websites that are subjected to a content analysis. The 191 websites of the corpus and the hyper-textual map of their edges are analysed using semantic features together with other tools of categorization
The Italian journal of geosciences is increasing its appeal among geoscientists
No full textThis is an Editorial of the new Editorial Board of the Italian Journal of Geosciences, composed by Marco Balini (Milan), Hugo Bucher (Zürich), Simonetta Cirilli (Perugia), Laura Crispini (Genoa), Maurizio Mazzucchelli (Modena), and Giulio Ottonello (Genoa), which underlines the progress in the appeal of the journal among Geoscientists
Da Gian Giacomo Valeri a Pietro Mazzucchelli: Cose degne di essere vedute et considerate nella grande Città di Milano.
No full textGian Giacomo Valeri (1572-1651) wrote a description of Milan in the first half of the 17th century with her principal monuments, palaces and collections. Pietro Mazzucchelli (1572-1651) found this unknown and very important source and he realized a copy, now in Biblioteca Ambrosiana
Transizioni familiari
No full textIl contributo delinea il concetto di transizione familiare nella vasta produzione scientifica di Donat
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