263,381 research outputs found
Le Fumarole di Vulcano
No full textIn tempi storici l’Isola di Vulcano è stata interessata da numerose eruzioni. Come già detto l’ultima
attività vulcanica è avvenuta fra il 1888 e il 1890. Da allora l’attività del vulcano è caratterizzata dalla presenza di numerose aree fumarolizzate...Published65 - 733.5. Geologia e storia dei vulcani ed evoluzione dei magmiope
Type Minerals from the Island of Vulcano, Aeolian archipelago, Sicily, Italy
No full textThe Aeolian archipelago consists of seven islands of volcanic origin, arranged along an arc 90
km long that extends westward with other submerged volcanoes. The Vulcano Island is the
southernmost and the third largest of these islands.
The island of Vulcano has an age of about 120,000 years...Istituto Nazionale di Geofisica e VulcanologiaPublishedNICOLOSI (CATANIA)3.5. Geologia e storia dei vulcani ed evoluzione dei magmiope
The iconography of Vulcan at the Este court: from Borso to Alfonso I d'Este.
No full textreservedIl presente lavoro di tesi magistrale cerca di ricostruire il rapporto denso e complesso tra la corte Estense e il mito di Vulcano dal primo decennio del XV secolo con il ducato di Borso I d’Este al primo del XVI secolo con Alfonso I. La ricerca si avvia con una panoramica delle origini del mito: il primo autore ad inserire il mito di Vulcano all’interno di un’opera letteraria fu Omero che nell’ Iliade lo descrive come protettore del fuoco e creatore di manufatti straordinari, mentre nell’ Odissea come il marito geloso di Venere. Generato dalla sola Era secondo Esiodo, figlio di Zeus e della sua consorte in base al racconto di Omero, sarebbe precipitato dall’ Olimpo per mano della madre, disgustata dal suo aspetto. La zoppaggine che lo caratterizza è stata recepita dalla ceramica attica che costituisce una precoce attestazione pittorica dell’iconografia del dio, raffigurato con attributi come tenaglie e martello. Nella letteratura classica egli è spesso esaltato per la creatività, elemento in comune con la dea Atena, con cui è stato sovente posto in relazione. Fonti come Omero e Filostrato lo citano come instancabile guerriero, dimentichi del suo difetto fisico. Un altro elemento che concorre a definire l’iconografia di Vulcano è la presenza dei Ciclopi che solo con la poesia alessandrina diventano stabilmente i mitici aiutanti di Efesto-Vulcano. Il corpo centrale della tesi è dedicato alle commissioni dei principali esponenti della casa d’Este: assiso su un carro trascinato da scimmie, il Vulcano di Palazzo Schifanoia si dirige verso la fucina con i Ciclopi; posto a rappresentanza del Mese di Settembre, viene affrescato tra il 1467 e il 1470 da Ercole de’ Roberti chiaramente ispirato dai versi dell’Odissea. Il paragrafo su Borso sottolinea la volontà del committente di ribadire una propria linea di successione attraverso la legittimazione del potere e il rimando ad antichi valori. L’interesse per Vulcano sembra diminuire negli anni della dominazione di Ercole I con la conseguente diminuzione delle occasioni per rappresentarne le vicende. Questo periodo storico apporta comunque grandi novità per Ferrara a partire dall’addizione erculea che vedrà la concretizzazione di un’ulteriore attestazione in città del dio del fuoco, con la decorazione della parasta d’angolo di Palazzo Diamanti attribuita a Gabriele Frisoni.
Alfonso I d’Este amerà, invece, identificarsi con questa divinità controversa, non solo per motivi di tipo propagandistico-militare, ma anche per una notevole affinità personale. Qualche decennio dopo il ciclo astrologico-celebrativo commissionato da Borso, Antonio Lombardo scolpiva un pannello con la mitica fucina per i Camerini d’Alabastro, mentre Benvenuto Tisi da Garofalo affrescava diciotto lunette della Sala del Tesoro a Palazzo Costabili, con il primo e il quattordicesimo voltino che offrono un focus su Vulcano al lavoro nella fucina, omaggio alle virtù civili del committente. Dosso Dossi nella sua Allegoria musicale coglie l’interesse del duca per la musica e raffigura il dio con un trappo rosso mosso dal vento, un attributo che diventa quasi costante nell’iconografia vulcaniana del XVI secolo. Si lega al drappo scarlatto anche la figura dipinta dal Mantegna per il Parnaso di Isabella d’Este.
Si analizzano poi anche le opere letterarie: tra gli autori Ludovico Ariosto presenta il dio fabbro nell’Orlando Innamorato, nei Suppositi e in altre opere teatrali e poetiche minori quasi sempre in relazione ad Alfonso I; Matteo Maria Boiardo ne sottolinea la folle gelosia nei Tarocchi.
L’indagine si estende, infine, per consentire un’adeguata comprensione della fortuna visiva del soggetto: importanti artisti come Vasari, Velázquez e Rubens tornano sul tema del dio fabbro, divenuto poi nel XIX secolo emblema della crescente industrializzazione
Aeromagnetic data provide new insights on the volcanism and tectonics of Vulcano Island and offshore areas (southern Tyrrhenian Sea, Italy)
No full textThe active Vulcano Island (Southern Tyrrhenian Sea)
represents the southernmost portion of a NW-SE elongated
volcanic ridge that includes also Lipari and Salina islands.
The ridge is affected by a regional, NW-SE to N-S striking
fault system. The elaboration and analysis of data from
three high-resolution aeromagnetic surveys carried out
between 1999 and 2004 on Vulcano and offshore allow us
to recognize high intensity magnetic anomalies related to
volcanic centers/conduits or shallow intrusions. Previously
unreported offshore submarine vents have been also
recognized. Some of them may correspond with source
areas of outcropping exotic pyroclastics on Vulcano. The
spatial analysis of the recognized magnetic anomalies and
volcanic structures shows that they are preferably aligned
along the strikes of the main regional faults that affect the
volcanic ridge. Submarine volcanic conduits revealed by
the aeromagnetic survey might represent potential sources
for future submarine, effusive or explosive activity.PublishedL153053.8. Geofisica per l'ambienteJCR Journalreserve
Time series analysis of high temperature fumaroles monitored on the island of Vulcano (Aeolian Archipelago, Italy)
No full textThe continuous monitoring shows short term dynamics and allows multidisciplinary comparisons. Sharp increases and trending variations were recorded in fumarole temperatures. The trends highlighted by punctual monitoring characterized the main fumaroles. A new phase of increasing temperature begun after the year 2001 at the rim fumaroles.The exhalation activity at the La Fossa cone (Vulcano Island, Aeolian Archipelago, Italy) has been ongoing for more than 1 century. Many of the monitored geochemical and geophysical parameters have showed transient
variations of energy release. The time-series analyses of fumarole temperatures presented in this paper enabled
the sequence of observations to be defined and information from different monitoring stations to be integrated. The motion of fluids feeding the fumaroles of the La Fossa cone is driven by the thermal and kinetic energies that balance the seismic and volcanic forces active in the region, and the temperatures of the fumaroles reflect the
local response of the hydrothermal system to these forces. During a 14-year period of observation, from 1998 to 2012, fumarole temperatures showed various trends but also cyclic variations characterized by sharp increases. The repetition of these variations during periods with different trends indicates that no physical variation
occurred from the hydrothermal source to the surface during the analyzed period, and after each periodic geochemical crisis the previous thermal conditions were restored. Although the continuous monitoring of hightemperature fumaroles was limited to only a few sites, the observed trends characterized the most important fumaroles in the area of Vulcano Island. An evaluation of thermal-energy release based on these spatially discrete measurements would be a speculative exercise in thermodynamics, but the analyses of the recorded data represent
a step forward in interpreting the signals from ongoing volcanic activity and in assessing the seismic risk.
© 2013 Elsevier B.V. All rights reserved.INGV-DPC projectPublished150-1631.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveJCR Journalrestricte
Bolboceroides Vulcano
No full textBolboceroides Vulcano et al. (®gures 21a±i, 22a, b, 23) Bolboceroides Vulcano et al., 1969; 167 (Tax.); Krikken 1984: 36. Type species: Bolboceras capense Klug, 1843, by original designation. The genus Bolboceroides is monotypic and the species description will therefore also serve as generic description.Published as part of Gussmann S. M. & Scholtz, C. H., 2000, Systematic revision of endemic southern African genera of Bolboceratinae (Coleoptera: Scarabaeoidea: Bolboceratidae), pp. 1045-1123 in Journal of Natural History 34 on page 1093, DOI: 10.1080/00222930050020122, http://zenodo.org/record/474797
Successione vulcano-sedimentaria triassica
No full textSuccessione vulcano-sedimentaria triassica delle Alpi Meridionali
Convective heat flux from hydrothermal system: First monitoring results at La Fossa of Vulcano
No full textFluids circulating inside hydrothermal systems drive thermal and kinetic energy to balance the acting forces. Convective heat flux variations can be affected either by change in regional tectonic factor and by magma migration, both processes accountable for volcanic risk. The thermal release on quiescent volcano is not negligible if compared to that associated to eruptions, according to balances on hydrothermal activity and eruptive activity (Nuccio & Valenza, 1986, Chiodini et al., 2001). Moreover outlet temperature of La Fossa fumaroles (Vulcano, Aeolian Islands), indicates that thermal energy release is not stationary (Chiodini et al., 1992), showing relationships either with changes in the magmatic components of fluids and with seismic energy release (Badalamenti et al 1987, Nuccio et al 2000, Diliberto et al 2002). However at Vulcano, to estimate the time variation of convective heat flux, mainly steam output has been measured so far (Italiano & Nuccio ,1992; Italiano et al., 1998)…(b).. Indeed some interesting changes of heat flux from soil have been recorded, in 1998 and in 2004-2005, with anew method tested out of fumarole area. The first variation was related to the seismic crisis of November 1998 (Aubert & Alparone, 2000, Diliberto & Alparone, 2004); the second one (November 2004) was probably due to both magmatic fluids migration and little seismic activity. These results indicate that with this method future changes in the heat power (range or distribution) could be monitored to obtain new clues on the evolution of the activity.PublishedIstituto Nazionale di Geofisica e Vulcanologia Palermo1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveope
Convective heat flux from hydrothermal system: First monitoring results at La Fossa of Vulcano
No full textFluids circulating inside hydrothermal systems drive thermal and kinetic energy to balance the acting forces. Convective heat flux variations can be affected either by change in regional tectonic factor and by magma migration, both processes accountable for volcanic risk. The thermal release on quiescent volcano is not negligible if compared to that associated to eruptions, according to balances on hydrothermal activity and eruptive activity (Nuccio & Valenza, 1986, Chiodini et al., 2001). Moreover outlet temperature of La Fossa fumaroles (Vulcano, Aeolian Islands), indicates that thermal energy release is not stationary (Chiodini et al., 1992), showing relationships either with changes in the magmatic components of fluids and with seismic energy release (Badalamenti et al 1987, Nuccio et al 2000, Diliberto et al 2002). However at Vulcano, to estimate the time variation of convective heat flux, mainly steam output has been measured so far (Italiano & Nuccio ,1992; Italiano et al., 1998)…(b).. Indeed some interesting changes of heat flux from soil have been recorded, in 1998 and in 2004-2005, with anew method tested out of fumarole area. The first variation was related to the seismic crisis of November 1998 (Aubert & Alparone, 2000, Diliberto & Alparone, 2004); the second one (November 2004) was probably due to both magmatic fluids migration and little seismic activity. These results indicate that with this method future changes in the heat power (range or distribution) could be monitored to obtain new clues on the evolution of the activity.PublishedIstituto Nazionale di Geofisica e Vulcanologia Palermo1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveope
Demicheleite-(I), BiSI, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy
No full textDemicheleite-(I), ideally BiSI, is the iodine-dominant analogue of demicheleite-(Br) and demicheleite-
(Cl). It was found in an active medium-temperature intracrateric fumarole at La Fossa crater, Vulcano
Island, Aeolian archipelago, Sicily, Italy. The mineral is the first bismuth sulphoiodide so far
discovered in a wholly natural environment, and corresponds to the already known synthetic
compound. It occurs as acicular to stout, translucent crystals up to 0.25 mm long in an altered
pyroclastic breccia, together with demicheleite-(Br), bismoclite, bismuthinite, godovikovite, panichiite,
aiolosite, brontesite, adranosite and other new phases under study. The colour is dark red to black, the
lustre submetallic. The unit cell is orthorhombic, space group Pnam, with a = 8.4501(7) A ̊ , b =
10.1470(9) A ̊ , c = 4.1389(4) A ̊ , V = 354.88(4) A ̊ 3, and Z = 4. The crystal habit is prismatic, with the
main forms {110} and {111} inferred from analogy with demicheleite-(Br). Twinning was not
observed. The strongest 6 lines in the X-ray powder diffraction pattern [dobs.(A ̊ ) (I/I0) (hkl)] are: 6.490
(100) (110); 4.346 (94) (120); 3.896 (90) (210); 2.709 (60) (310); 2.161 (38) (330); 3.243 (22) (220).
The chemical analysis obtained by WDS electron microprobe gave: Bi 58.32, S 9.43, I 23.69, Br 5.66,
Cl 1.01, totalling 98.11 wt.%, corresponding to an empirical formula (based on 3 a.p.f.u.) of:
Bi0.97S1.03(I0.65Br0.25Cl0.10)S1.00. The unit-cell data are close to those of the synthetic compound, whose
crystal structure is already known. The calculated density is 6.411 g cm 3
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