Structural diagenesis of shallow platform carbonates: Role of early embrittlement on fracture setting and distribution, case study of Monte Alpi (Southern Apennines, Italy)
JOURNAL OF STRUCTURAL GEOLOGY
Authors: La Bruna, Vincenzo; Lamarche, Juliette; Agosta, Fabrizio; Rustichelli, Andrea; Giuffrida, Alessandro; Salardon, Roland; Marie, Lionel
Bed-perpendicular, opening-mode diffuse fractures are common features in carbonate rocks because they become brittle during the first stages of diagenesis. Early-fractures could be independent of tectonics and form a background structural network from sub-millimeter to 10's of centimetres scale. This study focuses on the outcrop-to-micro scales structural, stratigraphic, and petrographic characterization of Lower Cretaceous, shallow-water, tight limestones of the Inner Apulian Platform exposed along the axial sector of the southern Apennines foldand-thrust belt, Italy. This work aims at understanding the formation of early diagenetic fractures during the first stages of sediment lithification, and on their impact on subsequent deformation mechanisms associated to polyphase tectonics. The results of field structural surveys, of petrographic and cathodoluminescence analyses of representative samples unravel the main structural-diagenetic processes in shallow-water carbonates. We document that early brittle fractures were intrinsically related to the host rock pore type and cementation processes, and summarize the overall time-dependant evolution of the structural assemblages in a conceptual model. This model includes all abutting and crosscutting relationships among the various structural elements from field to thin-section observation, and form the now days fracture network.
New perspectives for studies of reaction mechanisms at low-medium energies
ACTA PHYSICA POLONICA B
Authors: Gramegna, F; Mastinu, PF; Vannucci, L; Marchi, EB; Cherubini, R; Moroni, A; Bracco, A; Camera, F; Million, B; Wieland, O; Benzoni, G; Leoni, S; Airoldi, A; Sacchi, R; Galbusera, E; Giussani, A; Ottolenghi, A; Gadioli, E; Ballarini, F; Maj, A; Brekiesz, M; Kmiecik, M; Barlini, S; Lanchais, A; Bruno, M; D'Agostino, M; Geraci, E; Vannini, G; Ordine, A; Casini, G; Nannini, A; Chiari, M; Abbondanno, U; Milazzo, PM; Margagliotti, GV; Bonasera, A
Many open questions regarding the study of reaction mechanisms with heavy ions have still to be solved, even in the energetic range between 5 and 20 MeV/u, which is covered by the accelerating system Tandem XTU-Linac ALPI of the Laboratori Nazionali of Legnaro. Using complex apparatuses like GARFIELD, coupled with different ancillary detectors, it is possible to perform exclusive measurements, which should be capable of giving new important information, in order to better understand both nuclear structure problems, like for example the study of the mechanisms underlying the Giant Dipole Resonance Damping, and reaction mechanisms phenomena, like the characterization of those mechanisms which are responsible for the many-fragment emission. Preliminary results and future plans to be performed with the GARFIELD facility have been described.