Animating Place: Exploring Encounters in the Diverse City          下载免费PDF全文

Elizabeth Chacko  Michele Lobo  Adeline Tay 《Geographical review》2016,106(2):157-162

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Enriched asthenosphere melting beneath the nascent North African margin: trace element and Nd isotope evidence in middle–late Triassic alkali basalts from central Sicily (Italy)     

Rosolino Cirrincione  Patrizia Fiannacca  Michele Lustrino  Vanessa Romano  Annunziata Tranchina  Igor M. Villa 《International Journal of Earth Sciences》2016,105(2):595-609

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Disturbance and Community Pattern of Polychaetes Inhabiting Valle Magnavacca (Valli di Comacchio,Northern Adriatic Sea,Italy)     

Michele Mistri  Elisa A. Fano  Francesco Ghion  Remigio Rossi 《Marine Ecology》2002,23(1):31-49

Abstract. Polychaete community structure in Valle Magnavacca, the largest basin of the Valli di Comacchio (Northern Adriatic Sea) lagoonal ecosystem, was analyzed in a three‐year study. Three shallow‐water stations were sampled at about 3‐month intervals. Univariate and multivariate analyses were utilized to investigate community structure changes in relation to natural and man‐induced disturbance. The polychaete community at station 3, in the central area of the lagoon, was the most disturbed, while that of station 2 was the most well structured. We hypothesize that polychaete community structure results from regular seasonal disturbances which lead to almost predictable fluctuations in species abundance. Superimposed on these regular cycles are acute disturbance events that further reduce species abundance or exclude species from the habitat.  相似文献   

Ecological Differences in the Distribution of two Tethya (Porifera, Demospongiae) Species Coexisting in a Mediterranean Coastal Lagoon     

Giuseppe Corriero  rea Balduzz  Michele Sarà 《Marine Ecology》1989,10(4):303-315

Abstract. In the Sicilian lagoon Stagnone di Marsala, Tethya aurantium and T. citrina show different ecological distributions, although some overlapping occurs. The first species reaches its highest density where linear currents are maximal, and in this habitat it is particularly frequent on Posidonia oceanica rhizomes. The second species is more abundant in still water locations and is equally common on Posidonia rhizomes and on calcareous concretions. Such distributions can be related to water movement, Posidonia shoot density, and associated factors such as sedimentation and food availability. These observations are consistent with an adaptive interpretation of the morphofunctional features distinguishing the two species.  相似文献   

Coastal uplift rate at Matanzas (Cuba) inferred from MIS5e phreatic overgrowths on speleothems          下载免费PDF全文

Jo De Waele  Ilenia M. D'Angeli  Nicola Tisato  Paola Tuccimei  Michele Soligo  Joaquín Ginés  Angel Ginés  Joan J. Fornós  Igor M. Villa  Esteban R. Grau González  Stefano M. Bernasconi  Tomaso R. R. Bontognali 《地学学报》2017,29(2):98-105

Many morphological elements in Cuba's landscape (e.g. marine terraces, tidal notches) demonstrate that coastal uplift has taken place, but the rate at which this occurs is not known. Carbonate phreatic overgrowths on speleothems have been found in a cave in Central North Cuba, ~1 km from the present coastline at 16 m asl. They form exceptional and unique mushroom‐shaped speleothems and balconies decorating the walls of the rooms. These phreatic overgrowths on speleothems (POS) formed at the oscillating air–water interface in sea‐level controlled anchialine lakes. U/Th dating of these overgrowths suggests ages that are compatible with the Marine Isotope Stage 5e (i.e. 130–115 ka). These POS have fixed this sea‐level highstand and demonstrate that this part of Cuba has been subjected to a much lower uplift rate than previously reported, that is, less than 0.1 mm/year since the last interglacial.  相似文献   

Erratum to: Melilite-type and melilite-related compounds: structural variations along the join Sr2?x Ba x MgSi2O7 (0?≤?x?≤?2) and high-pressure behavior of the two end-members     

Matteo Ardit  Michele Dondi  Marco Merlini  Giuseppe Cruciani 《Physics and Chemistry of Minerals》2012,39(7):599-599

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Detection of Miocene saucer‐shaped sills (offshore Senegal) via integrated interpretation of seismic,magnetic and gravity data     

Sergio Rocchi  Alfredo Mazzotti  Michele Marroni  Luca Pandolfi  Paolo Costantini  Bertozzi Giuseppe  Davide di Biase  Francesco Federici  Papa Goumbo L 《地学学报》2007,19(4):232-239

The Atlantic margin offshore Senegal has been explored by seismic reflection and GRAV‐MAG surveys. High‐amplitude, laterally transgressive seismic reflectors are found to coincide with gravimetric and magnetic highs. Once seismic data are integrated with potential fields modelling, these reflectors can be safely interpreted as saucer‐shaped igneous sills, up to some hundreds of metres thick, some km wide. The occurrence of hydrothermal vent complexes and forced folds in the stratigraphic sequence above the sills constrain the intrusion age to the Miocene. Field observations and in‐situ magnetic susceptibility measurements of Oligocene–Miocene and Quaternary igneous rocks emplaced in coastal Senegal support this interpretation.  相似文献   

A numerical procedure for predicting rainfall‐induced movements of active landslides along pre‐existing slip surfaces     

Michele Calvello  Leonardo Cascini  Giuseppe Sorbino 《国际地质力学数值与分析法杂志》2008,32(4):327-351

A numerical model to predict landslide movements along pre‐existing slip surfaces from rainfall data is presented. The model comprises: a transient seepage finite‐element analysis to compute the variations of pore water pressures due to rainfall; a limit equilibrium stability analysis to compute the factors of safety along the slip surface associated with transient pore pressure conditions; an empirical relationship between the factor of safety and the rate of displacement of the slide along the slip surface; an optimization algorithm for the calibration of analyses and relationships based on available monitoring data. The model is validated with reference to a well‐monitored active slide in central Italy, characterized by very slow movements occurring within a narrow band of weathered bedrock overlaid by a clayey silt colluvial cover. The model is conveniently divided and presented in two parts: a groundwater model and a kinematic model. In the first part, monthly recorded rainfall data are used as time‐dependent flow boundary conditions of the transient seepage analysis, while piezometric levels are used to calibrate the analysis by minimizing the errors between monitoring data and computed pore pressures. In the second part, measured inclinometric movements are used to calibrate the empirical relationship between the rate of displacement along the slip surface and the factor of safety, whose variation with time is computed by a time‐dependent stability analysis. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

The transition between ‘orogenic’ and ‘anorogenic’ magmatism in the western Mediterranean area: the Middle Miocene volcanic rocks of Isola del Toro (SW Sardinia,Italy)     

Michele Lustrino  Vincenzo Morra  Lorenzo Fedele  Marcello Serracino 《地学学报》2007,19(2):148-159

The Isola del Toro is a small island (∼1 km²) about 5 nautical miles SW of Sardinia entirely made up of mildly alkaline sodic evolved rocks (benmoreites and trachytes) related to each other by fractionation processes. ⁴⁰Ar/³⁹Ar dating of an anorthoclase mineral separate from a trachyte gave an age of 11.83 ± 0.10 Ma. This age estimate falls within an interval previously considered a‐magmatic in Sardinia. The results of this study shift the beginning of the Middle Miocene–Quaternary anorogenic volcanism of Sardinia back to the Late Serravalian. The transition between orogenic and anorogenic activity in Sardinia is markedly different from that recorded in the rest of the circum‐Mediterranean area, where this transition is much more gradual, both in time and in terms of magma composition. On the other hand, the transition between orogenic and anorogenic magmatism in Sardinia is rather sharp and lacks hybrid compositions. The Isola del Toro volcanic rocks represent the first anorogenic products produced during the opening of the western Mediterranean Sea.  相似文献   

Absorption-line strengths of 18 late-type spiral galaxies observed with SAURON     

Katia Ganda  Reynier F. Peletier  Richard M. McDermid  Jesús Falcón-Barroso  P. T. de Zeeuw  Roland Bacon  Michele Cappellari  Roger L. Davies  Eric Emsellem  Davor Krajnovi&#;  Harald Kuntschner  Marc Sarzi  Glenn van de Ven † 《Monthly notices of the Royal Astronomical Society》2007,380(2):506-540

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