Search results for "PAntelleria"
showing 10 items of 73 documents
Contributo alla conoscenza dei licheni e funghi lichenicoli di Pantelleria (Trapani, Sicilia, Italia)
2011
Nell’ambito del progetto di censimento dei licheni del territorio dell’Isola di Pantelleria (Sicilia) sono stati sino ad oggi rilevati 234 taxa di questi 229 sono Ascomiceti lichenizzati e 5 funghi lichenicoli.
I costi della meccanizzazione nelle aziende viticole di Pantelleria
2008
Low-P hydrous phase equilibria of a pantellerite melt: constraints on pre-eruptive conditions of recent felsic explosive volcanism at Pantelleria.
2007
Recent felsic explosive magmatism at Pantelleria island: an experimental study
2009
LICHENI E FUNGHI LICHENICOLI DI PANTELLERIA (TRAPANI, SICILIA, ITALIA)
2009
LICHENI E FUNGHI LICHENICOLI DI PANTELLERIA (TRAPANI, SICILIA, ITALIA) Domenico OTTONELLO1, Domenico PUNTILLO2 1Dipartimento di Scienze Botaniche, Università degli Studi di Palermo, Via Archirafi 38, 90123 Palermo; 2Museo di Storia Naturale della Calabria ed Orto Botanico, Università degli Studi della Calabria, 87036 Arcavacata di Rende (CS) L'Isola di Pantelleria è stata oggetto di numerosi studi floristici e fitosociologici sulla flora vascolare. Per quanto concerne i licheni, i pochi lavori risalgono al secolo scorso e agli inizi di quello attuale. La flora lichenica di Pantelleria consta di 219 taxa di cui 74 nuovi per l'isola e uno nuovo per l’Europa (Bacidia insularis Zahlbr.). Le spe…
The behavior of Rare-Earth Elements, Zr and Hf during biologically-mediated deposition of silica-stromatolites and carbonate-rich microbial mats
2015
Abstract Venere Lake, in the Pantelleria Island thermal system (Central Mediterranean Sea) consists of a mix of seawater and hydrothermal volcanic fluids containing high levels of dissolved SiO 2 . Close to the lake's thermal springs, siliceous stromatolites are deposed under high bacterial activity conditions whereas roughly interlaminated Ca-carbonates and microbial mats are widely scattered in the lake. The dissolved REE speciation in lake waters is dominated by [REE(CO 3 ) 2 ] − , [REE(CO 3 )] + and [REE(H 3 SiO 4 )] 2 + complexes. On the contrary the most abundant Zr and Hf species are hydroxyl- and fluoride-complexes. The behavior of REE Zr and Hf in the Venere lake waters is controll…
Correlation of welded ignimbrites on Pantelleria (Strait of Sicily) using paleomagnetism
2011
Although the oldest volcanic rocks exposed at Pantelleria (Strait of Sicily) are older than 300 ka, most of the island is covered by the 45–50 ka Green Tuff ignimbrite, thought to be related to the Cinque Denti caldera, and younger lavas and scoria cones. Pre-50 ka rocks (predominantly rheomorphic ignimbrites) are exposed at isolated sea cliffs, and their stratigraphy and chronology are not completely resolved. Based on volcanic stratigraphy and K/Ar dating, it has been proposed that the older La Vecchia caldera is related to ignimbrite Q (114 ka), and that ignimbrites F, D, and Z (106, 94, and 79 ka, respectively) were erupted after caldera formation. We report here the paleomagnetic direc…
Pantelleria island (Strait of Sicily): volcanic history and geomorphological landscape
2017
Pantelleria is a volcanic island located in the Strait of Sicily, 95 km far from the Sicilian coastline and 67 km from Cape Bon (Tunisia). The volcanological history of the island begins approximately 324 ka BP and the last eruptive event was a submarine eruption that occurred on 1891 A.D. Eruptive activity was characterized by seven very intense explosive events, the latest being the Green Tuff (44 ka). They have all produced ignimbrite sheets that covered large sectors of the island. The landscape of the island mirrors the variety of the eruptive styles and their interplay with volcano-tectonics. The most evident geomorphological features are represented by: (i) the mantle-like distributi…
Geologia e geomorfologia di Pantelleria con particolare riferimento al settore costiero di Scauri
2009
A revision of the structure and stratigraphy of pre-Green Tuff ignimbrites at Pantelleria (Strait of Sicily)
2013
International audience; At Pantelleria, peralkaline silicic magmas were erupted across a range of eruptive typologies and magnitudes: pyroclastic flows, Plinian to strombolian pumice fallout and lava flows. In this paper we focus on the intermediate cycle of eruptive activity which is bracketed by ignimbrite units slightly older than the two caldera collapses which marked the volcanological activity of the island. This age interval (180-85 ka) was punctuated by six ignimbrite-forming eruptions (silicic and variably peralkaline) for a cumulative erupted magma volume of approximately 6 km3 dense rock equivalent. Based on new 40Ar/39Ar (Na,K)-feldspar ages and petrographic data, we propose an …