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Age of the deformation phases in the Internal Liguride Units: evidences from Lower Oligocene Val Borbera Conglomerates of Tertiary Piedmont Basin (Northern Italy)
No full textThe Tertiary Piedmont Basin (Northern Italy) represents an episutural basin developed onto Alpine and Apenninic units previously deformed during the Late Cretaceous to Eocene tectonic events. In its eastern sector a thick pile of lower Oligocene conglomerates, known as Val Borbera conglomerate, crops out. The Val Borbera conglomerate consists of an up to 2500 m thick succession of prevalently massive to crudely bedded conglomerates. The source areas of these conglomerates were characterized by the occurrence of sedimentary and metamorphic rocks. In two beds from uppermost level of the Val Borbera conglomerate pebbles derived from very Low-grade metamorphic rocks have been recognized. Their petrographical features indicate that these rocks can be correlated with the lithologies of the Internal Liguride units. The petrographical and microstructural analyses of these pebbles suggest that almost two deformation phases affected the Internal Liguride units before their subaerial erosion to supply the detritic materials of the Val Borbera conglomerate. Consequently, these folding phases are older than the Val Borbera conglomerate (Early Oligocene), and predate the emplacement of the Liguride units onto the sub-Ligurian and Tuscan domains
La rappresentazione della deformazione a livelli strutturali superficiali: l’esempio della Val Borbera.
No full textIntegration of outcrop, core and wireline log facies analysis for reservoir characterization: an example from Salsomaggiore area (Northern Apennnines)
No full textPolyphase folding at upper structural levels in the Borbera valley (Northern Apennines, Italy): implications for the tectonic evolution of the linkage area between Alps and Apennines
Full text linkThe Borbera Valley (northwestern Italy) is located in a complex geological area where the linkage between Alps and Apennines occurs. In this area the Antola Unit (Late Cretaceous–Palaeocene) is unconformably overlain by the Upper Eocene–Miocene succession of the Tertiary Piedmont Basin. The structural analysis indicates the occurrence of a folding phase of Late Oligocene–Early Miocene age, characterised by recumbent F2 folds. These folds are superposed onto D1 structures related to an early folding phase of Middle Eocene, affecting only the Antola Unit. The occurrence of map-scale D2 folding phase structures that affect the Tertiary Piedmont Basin succession suggests that the linkage area between Alps and Apennines was reactivated during the Late Oligocene–Early Miocene
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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