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Magmatic enclaves in the Euganean Hills (North-Eastern Italy) as a record of the evolution of a within-plate magmatic district
No full text
The Euganean Hills (Northern Italy) show their magmatic evolution also through the magmatic enclaves
No full textChemistry of amphiboles and clinopyroxenes from Euganean (NE Italy) cumulitic enclaves: implications for the genesis of melts in an extensional setting.
No full textU-Pb SHRIMP II geochronology of the magmatic enclaves occurring in the Euganean Hills magmatic complex.
No full textAmphiboles and clinopyroxenes from Euganean (NE Italy) cumulus enclaves: evidence of subduction-related melts below Adria microplate
No full textEuganean Hills are a magmatic district
belonging to the Veneto Volcanic Province, whose magmatism
developed during an extensional tectonic regime
within the Alpine orogenesis in an intra-plate setting (the
Adria microplate). Mafic and ultramafic cumulus enclaves
occur within the Euganean trachytes. We estimated the
trace element composition of liquids in equilibrium with
cumulus minerals, employing a set of partition coefficients.
Parental melts of cumulus clinopyroxenes are characterized
by a marked enrichment in LILE, Th and U relative to
N-MORB. Conversely, HREE and HFSE concentrations
resemble N-MORB contents. These geochemical signatures
are typical of subduction-related magmas, and also
characterized the parental melts of Adamello cumulates.
Conversely, Veneto Volcanic Province mafic lavas show
geochemical patterns typical of anorogenic magmas.
Therefore, those rocks are not cogenetic with Euganean
cumulates, which are interpreted as crystallized from
Alpine subduction-related basaltic magmas. These cumulates
were subsequently dismembered and transported to
shallower levels by ascending lavas related to the Veneto
Volcanic Province magmatism. Therefore, magmatic
products related to Alpine subduction are more widespread
beneath the Adria microplate than previously known
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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