Debris-avalanche deposits of the Milo Lahar sequence and the opening of the Valle del Bove on Etna volcano (Italy)

Calvari, Sonia; Tanner, Lawrence H.; Groppelli, Gianluca

doi:10.1016/s0377-0273(98)00089-4

Cited by 51 publications

(49 citation statements)

References 35 publications

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“…These volcanogenic sequences are similar to volcanogenic deposits commonly identifiable in ring plain associations, on the outer flanks of a volcanic edifice (i.e. Hackett & Houghton 1989;Palmer and Neall 1991;Calvari & Groppelli 1996;Cronin et al 1996;Calvari et al 1998;Bret et al 2003;Roa 2003) with individual volcanogenic horizons commonly interrelated, with transitions (i.e. debris flow to stream flow) causing facies changes with distance from catchment/valley regions, directly influencing the observed depositional characteristics.…”

Section: Comparison Of Intra-volcanic Sedimentation With Ring Plain Asupporting

confidence: 53%

“…Etna (Calvari & Groppelli 1996;Calvari et al 1998), La Palma (Roa 2003), and Reunion (Bret et al 2003). This paper describes a newly exposed Hays Bay Volcanogenic Sequence (hereafter referred to as HBVS) at Black Point, a small peninsula between Hays and Church Bays, on the northeastern side of Lyttelton Harbour, Banks Peninsula, New Zealand (Fig 1, 2).…”

Section: Introductionmentioning

confidence: 99%

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Syn-eruptive alluvial and fluvial volcanogenic systems within an eroding Miocene volcanic complex, Lyttelton Volcano, Bank Peninsula, New Zealand

Hampton

Cole

Bell

2012

New Zealand Journal of Geology and Geophysics

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The Diamond Harbour Volcanic Group (DHVG; 8.1Á5.8 Ma) was deposited during the last stage of volcanism on Banks Peninsula, New Zealand. Interbedded with eruptives of the DHVG are volcanogenic sequences that constrain erosional extent, processes, timing, and degradation of Lyttelton Volcano. Such phases of erosion and deposition are commonly recorded in volcanic ring plains, but exposures within the highly eroded Lyttelton Volcano provide an excellent example of degradation processes and deposition in the interior of an eroding volcano. At Black Point, eastern Lyttelton Harbour, the Hays Bay Volcanogenic Sequence of the DHVG comprises interbedded conglomerate and sandstone, formed by debris flows to stream flows in an EÁW valley-controlled alluvial fan system. Volcanogenic sequences elsewhere around Lyttelton Harbour are formed from multiple alluvial fan systems depositing into a braided alluvial/fluvial, single outlet depositional basin, indicating the inception of a NNE draining proto-Lyttelton Harbour by 8.1 Ma.

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Section: Comparison Of Intra-volcanic Sedimentation With Ring Plain Asupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Syn-eruptive alluvial and fluvial volcanogenic systems within an eroding Miocene volcanic complex, Lyttelton Volcano, Bank Peninsula, New Zealand

Hampton

Cole

Bell

2012

New Zealand Journal of Geology and Geophysics

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“…The carbon contamination problem has previously been recognized at Etna, and has been proposed by Guest et al (1984) to explain a suite of wide-ranging 14 C ages on the upper tephra ashes, exposed in a number of valleys truncated by the southern rim of the Valle del Bove. Consequently, it may be that the age of emplacement of the stürtzstrom material within the Milo Lahars is somewhat younger than that proposed by the single 8.4 ka 14 C age of Calvari et al (1998).…”

Section: Implications Of Exposure Ages For the Formation Of The Vallementioning

confidence: 80%

“…While an origin owing to prehistoric lateral collapse is now corroborated by subaerial and offshore stürtzstrom deposits adjacent to the amphitheatre's open, downslope, outlet (e.g. Calvari et al 1998;Del Negro & Napoli 2002;Pareschi et al 2006), important aspects of the Valle del Bove have remained a matter of debate; most notably, the nature and cause of its excavation, and its age. Models for its origin are diverse and include marine (Lyell 1849) or fluvial (Lyell 1858) erosion, glacial excavation (Vagliasindi 1949), gravity-driven progressive landsliding (Guest et al 1984), edifice spreading (Borgia et al 1992), eruption-triggered catastrophic failure (Kieffer 1977;McGuire 1982), and tectonically or magmatically driven failure following formation of the Ellittico caldera (Calvari et al 2004).…”

Section: Volcano Lateral Collapse At Mount Etnamentioning

confidence: 99%

“…Accumulating evidence, however, increasingly supports a Holocene age for Valle del Bove formation. Calvari et al (1998) allocate a 14 C age of 8.4 ka BP (corresponding to an intercept of radiocarbon age with calibration curve at 6400 BC) to a palaeosol on top of a debris flow unit immediately above a stürtzstrom component within a sequence of debris flows (the Milo Lahars; ML in figure 1) exposed immediately east of the Valle del Bove's seaward outlet. The authors link the stürtzstrom to an initial excavation phase of the Valle del Bove that they propose, on a petrological basis, involved the northern part of the Valle del Bove only and was linked to lateral collapse of the Ellittico eruptive centre.…”

Section: Volcano Lateral Collapse At Mount Etnamentioning

confidence: 99%

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Climate forcing of volcano lateral collapse: evidence from Mount Etna, Sicily

Deeming

McGuire

Harrop

2010

Phil. Trans. R. Soc. A.

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In this study, we present evidence for early Holocene climatic conditions providing circumstances favourable to major lateral collapse at Mount Etna, Sicily. The volcano's most notable topographic feature is the Valle del Bove, a 5 × 8 km cliff-bounded amphitheatre excavated from the eastern flank of the volcano. Its origin due to prehistoric lateral collapse is corroborated by stürtzstrom deposits adjacent to the amphitheatre's downslope outlet, but the age, nature and cause of amphitheatre excavation remain matters for debate. Cosmogenic 3 He exposure ages determined for eroded surfaces within an abandoned watershed flanking the Valle del Bove support channel abandonment ca 7.5 ka BP, as a consequence of its excavation in a catastrophic collapse event. Watershed development was largely dictated by pluvial conditions during the early Holocene, which are also implicated in slope failure. A viable trigger is magma emplacement into rift zones in the eastern flank of a water-saturated edifice, leading to the development of excess pore pressures, consequent reduction in sliding resistance, detachment and collapse. Such a mechanism is presented as one potential driver of future lateral collapse in volcanic landscapes forecast to experience increased precipitation or melting of ice cover as a consequence of anthropogenic warming.

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Three‐Dimensional Modeling of Mount Etna Volcano: Volume Assessment, Trend of Eruption Rates, and Geodynamic Significance

2018

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3‐D modeling of Mount Etna, the largest and most active volcano in Europe, has for the first time enabled acquiring new information on the volumes of products emitted during the volcanic phases that have formed Mount Etna and particularly during the last 60 ka, an issue previously not fully addressed. Volumes emitted over time allow determining the trend of eruption rates during the volcano's lifetime, also highlighting a drastic increase of emitted products in the last 15 ka. The comparison of Mount Etna's eruption rates with those of other volcanic systems in different geodynamic frameworks worldwide revealed that since 60 ka ago, eruption rates have reached a value near to that of oceanic‐arc volcanic systems, although Mount Etna is considered a continental rift strato‐volcano. This finding agrees well with previous studies on a possible transition of Mount Etna's magmatic source from plume‐related to island‐arc related. As suggested by tomographic studies, trench‐parallel breakoff of the Ionian slab has occurred north of Mount Etna. Slab gateway formation right between the Aeolian magmatic province and the Mount Etna area probably induced a previously softened and fluid‐enriched suprasubduction mantle wedge to flow toward the volcano with consequent magmatic source mixing.

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Debris-avalanche deposits of the Milo Lahar sequence and the opening of the Valle del Bove on Etna volcano (Italy)

Cited by 51 publications

References 35 publications

Syn-eruptive alluvial and fluvial volcanogenic systems within an eroding Miocene volcanic complex, Lyttelton Volcano, Bank Peninsula, New Zealand

Syn-eruptive alluvial and fluvial volcanogenic systems within an eroding Miocene volcanic complex, Lyttelton Volcano, Bank Peninsula, New Zealand

Climate forcing of volcano lateral collapse: evidence from Mount Etna, Sicily

Three‐Dimensional Modeling of Mount Etna Volcano: Volume Assessment, Trend of Eruption Rates, and Geodynamic Significance

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