1,721,023 research outputs found
Structural evolution of the Apenninic-Maghrebian orogen in Eastern Sicily: thermal and thermochronological constraints
No full textTemperature-dependent clay mineral assemblages and vitrinite reflectance data have been used to investigate levels of diagenesis from the Sicilian-Maghrebian fold-and-thrust belt in Eastern Sicily at the footwall of the Kabilian-Peloritan-Calabrian Arc. Data are from units sampled between the Nebrodi Mountains to the north and Mt. Judica to the south. The integration of organic and inorganic thermal indicators allowed us to distinguish portions of the accretionary wedge with different thermal maturity and thermo-chronological evolution and to define the maximum temperature that thrust-top, foredeep basin deposits and accreted passive margin units experienced. VRo% values between 0.60-0.96% and illite content in mixed-layer I-S (60-85%) are found in trench-involved and in accreted passive margin units. Lower VRo% values (0.20-0.50%), and percentage of illite layers in I-S (30-60%) are found in thrust-top and foredeep basin deposits and in units back-thrust toward the hinterland and mainly gravity-mobilized toward the Hyblean Plateau. Apatite fission-track data from the trench-involved deep structural units were partially to totally annealed during wedge accretion and indicate that subsequent exhumation have occurred mainly in Burdigalian times. Shallow structural units of the wedge have been removed by tectonics and erosion
Structural evolution of the Apenninic-Maghrebian orogen in Eastern Sicily: thermal and thermochronological constraints.
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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
Maximum burial and unroofing of Mt. Judica recess area in Sicily: implication for the Apenninic–Maghrebian wedge dynamics
No full textWe integrated X-ray diffraction (XRD) data concerning the illite content in mixed-layer illite–smectite with
data derived from Fourier Transform Infrared spectroscopy (FTIR) on H-rich organic matter to constrain the
burial-exhumation path of the Mt. Judica sedimentary succession cropping out in tectonic window in Eastern
Sicily.
Thermal structural model constrained by organic and inorganic thermal parameters showed that the Mt.
Judica succession experienced paleo-temperatures in the range of 100–130 °C in deep diagenetic conditions
and early mature stage of hydrocarbon generation. Specifically, the illite content in mixed-layer I–S ranges
from 50 to 76% and FTIR-derived indexes suggest a thermal maturity equivalent to VRo values of at least
0.5–0.7%. As a whole, the Mt. Judica succession experienced maximum tectonic burial (ranging between
2.4 and 3.2 km) during the Middle Miocene as a result of the emplacement of the allochthonous units atop
it. The subsequent breaching phase characterized by up-thrust geometries, and erosion during Pliocene
times ruled out the Mt. Judica exhumation. This last tectonic phase did not overprint thermal maturity because
the extent of overthrusting was negligible when compared with the magnitude of vertical movements.
Restoration of balanced cross sections revealed an increase of shortening from the salient to the Mt. Judica
recess with values from 12.3 to 23.9 km, consistent with the increase of tectonic thickening of the foldand-
thrust belt. Integration of maximum burial and shortening values along the curvature of the Sicilian
fold-and-thrust belt allowed us to reconstruct the wedge paleo-geometry in the Mt. Judica recess area, to investigate
the along-strike variations of the tectonic overburden, and to discuss the geodynamic causes of
these changes. These results were compared with theoretical models of wedge dynamics
Tectonics and paleo-seismicity in the Peloritani Mountains: evidences from the Miocene siliciclastic deposits
No full textCarbon uptake dynamics associated to the management of unused lands for urban CO2 planning
No full textTrees absorb CO2 and reduce the impact of GHGs. This paper deals about the carbon uptake dynamics produced by the management of unused lands as tool to help the fulfilment of international commitments on atmospheric CO2. The paper introduces a new perspective of using the unused lands around Municipalities to compensate the carbon emissions of urban contexts, according to the Sustainable Energy Action Plans as answer to climate change, already approved by the most part of Cities in Europe. The model of the carbon dynamics is based on a genetic algorithm which allows to find the sequence of operations on the unused land in space (portions of the land) and time (rotation of cuts and plantations) to ensure the reaching of a given outcome in terms of carbon captured. The algorithm, therefore, behaves as design support of land management, enriching the literature available for the sector. The paper identifies two possible original scenarios of storing carbon referred as “emergency” and “constant rate”; the first produces after fifty years a maximum carbon uptake of the order of 100 tC/ha while the second a maximum uptake rate of the order of 2 tC/(year ha), after an initial start-up period of 40–50 years
Urban context and neighbouring lands: how reforestation could have a role in the implementation of Sustainable Energy and Climate Action Plans
Full text linkThermal evolution of the Meso-Cenozoic pelagic basin of Mt. Judica (Eastern Sicily) by means of FTIR spectroscopy on organic matter and X-ray diffraction analysis on clay mineral assemblages: implications for burial and exhumation history.
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