Evidence of incremental growth in the Vulsinian calderas (central Italy)

Nappi, Giovanni; Renzulli, Alberto; Santi, Patrizia

doi:10.1016/0377-0273(91)90098-k

Cited by 56 publications

(42 citation statements)

References 13 publications

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“…The NE-SW structural control, possibly related to strike-slip faults [Fazzini and Gelmini, 1982], is highlighted by the NE-SW trending gravity anomalies ( Figure 5a) [Orlando et al, 1991] and elongation of the K seismic horizon isobaths [Gianelli et al, 1997]. At Vulsini, several vents at Latera form a NE-SW trending eruptive fissure, subparallel to the elongated Vepe Caldera (Figure 5b) [Capaccioni et al, 1987;Vezzoli et al, 1987;Nappi et al, 1991]. The related products are the most primitive within the Vulsini District [Peccerillo et al, 1987].…”

Section: Main Fissure Eruptionsmentioning

confidence: 99%

“…The main feature is the down-sag Bolsena Caldera (Figure 4a), along a NW-SE trending graben (Figure 3a). A NE-SW graben-like structure partly controls volcanic activity within the NE-SW elongated Latera Caldera (0.60 -0.10 Ma) (Figure 4a) [Vezzoli et al, 1987;Nappi et al, 1991]. Vico District (0.80 -0.09 Ma) erupted alkaline potassic lavas, forming a caldera at the intersection between NW-SE and NE-SW faults (Figure 3a) La Torre et al, 1981].…”

Section: Main Volcanic Edificesmentioning

confidence: 99%

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Transverse systems along the extensional Tyrrhenian margin of central Italy and their influence on volcanism

2006

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[1] The Tyrrhenian margin of central Italy has undergone Plio-Quaternary extension, developing NW-SE normal faults and NE-SW faults. The NE-SW faults decrease in frequency toward NE with the stretching factor b, becoming negligible for b < 1.3. Plio-Quaternary volcanoes, aligned NW-SE, formed at the intersection among NE-SW and NW-SE faults; fissure eruptions are mostly controlled by NE-SW faults. Structural field data show normal motions for 76% of NW-SE Quaternary faults and transtensive for 73% of NE-SW Quaternary faults. Analogue experiments simulating the NE-SW Tyrrhenian extension show that transverse transtensive faults form with differential extension Db > 0.21. These data suggest that the NE-SW transtensive structures are transfer faults of the NW-SE normal faults due to relevant differential extension (Db > 0.21) within a stretched crust (b > 1.3). The minor dip-slip and strikeslip components of the NE-SW and NW-SE faults, respectively, possibly result from the NW-SE extension due to the southeastward slab retreat beneath the Calabrian arc. The NE-SW and NW-SE extensions in the central southern Tyrrhenian Sea account for the composite kinematics of the NE-SW structures, which, in turn, exert a twofold role in controlling volcanism. Where their dip-slip component forms basins, the associated decompression induces magma accumulation (developing central volcanoes) at the intersection among NW-SE and NE-SW systems. Where transfer faults are mainly strike slip, their inferred subvertical attitude enhances their permeability to magma, accounting for the observed NE-SW fissure eruptions. Regional extension, forming NW-SE faults, enhances the overall generation and rise of magma along the margin, but NE-SW structures focus magma rise and emplacement at shallower levels. Citation: Acocella, V., and R.

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Section: Main Fissure Eruptionsmentioning

confidence: 99%

Section: Main Volcanic Edificesmentioning

confidence: 99%

Transverse systems along the extensional Tyrrhenian margin of central Italy and their influence on volcanism

2006

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“…Lakes Vico and Nemi are smaller (0.26 and 0.03 km 3 ), but are also of interest as they also occupy volcanic basins. These lakes are largely the result of Pleistocene volcanic activity (Barbanti & Carollo 1966;Carollo & Barbanti 1971;Camponeschi & Lombardi 1969); the formation of lakes Bolsena and Bracciano in particular is related to subsidence and caldera formation during the final stages of volcanic activity (Pichler 1970), with direct control by large-scale tectonic processes (Nappi et al 1991;Niessen et al 1993). A complex volcano-tectonic origin for the lake Bolsena and Bracciano basin was suggested by Locardi et al (1976).…”

Section: Introductionmentioning

confidence: 99%

Lake Bolsena (Central Italy): an updating study on its water chemistry

Mosello¹,

Arisci²,

Bruni³

2004

J Limnol

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“…1) consists of a huge polygenetic structure produced by a series of ig nimbrite-forming eruptions (Sparks, 1975;Metzeltin and Vezzoli, 1983;Nappi et al, 1991) occutring during a period of about 0.17 m.y. Its youngest activity has been dated at 110,000 years ago (Santi, 1990).…”

Section: Areas Of Recently Exhausted Volcanismmentioning

confidence: 99%