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Il ruolo dell’architettura del paleomargine mesozoico di Adria nel sistema orogenico del Gran Sasso d’Italia (Appennino centrale)
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Gran Sasso D’Italia: dai Prati di Tivo ai Prati di Tivo attraverso il Ghiacciaio del Calderone, il Corno Grande, Campo Pericoli e la Val Maone
No full textInherited mesozoic architecture of the Adria continental paleomargin in the Neogene Central Apennines evolution
No full textStructural analysis carried out in the outer zones of the Central Apennines of Italy, integrating surface and subsurface data with seismic profiles, has made it possible to define the main modes of interaction between the architecture of the Mesozoic palaeomargin of the Adria plate and the central-Apennines orogenic system (namely the thrust-foredeep-foreland system) during the Neogene- Quaternary contractional events.
A complex architecture of the Mesozoic palaeomargin is well defined in the central Apennines by the occurrence of alternating Triassic-Miocene platforms and basins. These palaeogeographic domains were differentiated following the onset of extensional def- ormation during Upper Triassic and Middle Liassic times, and the consequent drowning of distinct parts of a formerly wider platform. Within the Apennine fold-and-thrust system, the main features rec- ognised are: a) the distribution of the Triassic-Miocene platform and basin domains, which are transverse and longitudinal with respect to the trends of younger contractional structures; b) the cor- respondance of the Neogene-Quaternary syn-orogenic depocentres with older pelagic basins; c) the occurrence, in the thrust belt, of salient geometries, as seen in map view, corresponding to the pala- leomargin architecture and to the physiography of the syn-orogenic basins.
Balanced and restored cross-section construction across the Adriatic offshore area, i.e. the present foreland of the Apennine belt, and the axial zone of the thrust system through the orogenic front, has made it possible to outline the role of the architecture of the Mesozoic palaeomargin in the evolution of the Messinian-Quater- nary syn-orogenic basins. These depressions are characterised by wide antiformal and synformal flexures with wavelength of 50-80 km, located respectively on carbonate platform and pelagic basin domains.
The reconstructed geometry suggests that crustal- and/or lithos- pheric-scale buckling was more important than foreland bending as a driving deformation process. The development of reverse/trans- pressive and normal faults further accentuated the prominent phys- iographic differences within syn-orogenic basins. Some of these nor- mal faults accommodated outer-arc extension and reactivated pre-orogenic extensional structures. During development of the thrust system, the palaeomargin architecture and pre/syn-orogenic normal faults controlled the location of thrust ramps, producing the salient geometries characteristic of the outer zones of the Apennine belt. In particular, pre-existing normal faults were truncated by thrusts that propagated upwards following «short-cut» trajectories, but also were rotated in steep fold limbs and/or partly reactivated.
Therefore, the tectonic setting of the belt results from interac- tion of the orogenic system and the architecture of the palaeomar- gin. The syn-orogenic basins were characterised by structural highs and depocentres that appear controlled by crustal-lithospheric anisotropies related to buckling and foreland flexure induced by oro- genic load. This geometry, in turn, controlled the final geometry of the thrust belt, where it is possible to document that thrust sheet culminations and depressions reflect syn-orogenic structural highsand basins, respectively. The modes of palaeomargin-foredeep-thrust belt interaction recognised provide important information on the estimate of orogenic shortening, and on the burial-exhumation path of the Central Apennines
Inherited mesozoic architecture of the Adria continental palaeomargin in the neogene central apennines orogenic system, Italy
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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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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