Water-settling and resedimentation of submarine rhyolitic pumice at Yali, eastern Aegean, Greece

Allen, Sharon; McPhie, Jocelyn

doi:10.1016/s0377-0273(99)00127-4

Cited by 79 publications

(65 citation statements)

References 36 publications

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“…The volume of pumice produced by the shallower-water eruptions was also greater, forming thick aprons of pumice with steep slopes to depths of 1000 m. Transport by grain fl ows caused size segregation of giant pumice clasts into lobe fronts. We predict that these thick pumice aprons are internally bedded and fi nes poor, and they resemble bedded, well-sorted pumice observed in the caldera wall at 500-900 mbsl at Myojin Knoll caldera (Fiske et al, 2001), and >300-150 mbsl at Kolumbo volcano (Carey et al, 2008), and in the uplifted 120-m-thick pumice succession at Yali (Allen and McPhie, 2000).…”

Section: Clast Formation and Eruption Mechanismsmentioning

confidence: 67%

“…Spalled giant pumice clasts rose to the sea surface hissing with steam (e.g., Reynolds et al, 1980;Kano, 2003). Spalled giant pumice clasts have also been produced during sublacustrine dome eruptions (e.g., Taupo eruption- Wilson and Walker, 1985;Sierra La Primavera-Mahood, 1980;Clough et al, 1981), and some examples occur in uplifted submarine arc successions (e.g., Allen and McPhie, 2000). Depth constraints and eruption mechanisms of spalling, however, are unknown.…”

Section: Introductionmentioning

confidence: 99%

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Effects of water depth on pumice formation in submarine domes at Sumisu, Izu-Bonin arc, western Pacific

Allen¹,

Fiske²,

Tamura³

2010

Geology

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Section: Clast Formation and Eruption Mechanismsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effects of water depth on pumice formation in submarine domes at Sumisu, Izu-Bonin arc, western Pacific

Allen¹,

Fiske²,

Tamura³

2010

Geology

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“…As the youngest eruption of the system (Yali rhyolite, [25]) is chemically very similar to the KPT (after a period of more mafic magmatism during the construction of the Nisyros cone), I would argue that the location should be closely monitored for future caldera-forming eruption of silicic magma. …”

Section: Discussionmentioning

confidence: 99%

“…The eruption is inferred to have formed a caldera at least 6-11 km in diameter, and perhaps as much as 20 km [16]. Subsequent activity, such as the Nisyros composite volcano (e.g., [17][18][19][20][21][22][23][24]), the Yali pumice cone and rhyolite lavas [25], the Pleistocene-recent Strongyle basaltic andesitic cone, and several submarine volcanoes in the area of Yali and Nisyros [26] all indicate that the Kos-Nisyros system remains magmatically active at present.…”

Section: Aegean Arcmentioning

confidence: 99%

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

Bachmann

2010

Open Geosciences

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Abstract:The Kos Plateau Tuff is a large (>60 km 3 ) and young (160 k.y.) calc-alkaline, high-SiO 2 rhyolitic ignimbrite from the active Kos-Nisyros volcanic center in the Aegean arc (Greece). Combined textural, petrological and geochemical information suggest that (1) the system evolved dominantly by crystal fractionation from (mostly unerupted) more mafic parents, (2) the magma chamber grew over 250 000 years at shallow depth (∼1.5-2.5 kb) and was stored as a H 2 O-rich crystalline mush close to its solidus (∼670-750°C), (3) the eruption occurred after a reheating event triggered by the intrusion of hydrous mafic magma at the base of the rhyolitic mush. Rare banded pumices indicate that the mafic magma only mingled with a trivial portion of resident crystal-rich rhyolite; most of the mush was remobilized following partial melting of quartz and feldspars induced by advection of heat and volatiles from the underplated, hotter mafic influx.

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“…The pumice clasts are angu- The upper part of the EPF consists of Rentanbau Tuffs (RT) (Figure 1). These tuffs comprise thinly bedded to finely laminated ( Figure 7) volcanic glass shard-rich sands and silts containing calcareous microfossils (Figures 8 and 9) commonly used as indicators of a shallow marine depositional environment [28,29]. They were interpreted as a product of phreatomagmatic eruption as sea water accessed the vents because of the presence of arcuate fracture surfaces on the glass shards [20].…”

Section: Efate Pumice Formationmentioning

confidence: 99%

Is Efate (Vanuatu, SW Pacific) a result of subaerial or submarine eruption? An alternative model for the 1 Ma Efate Pumice Formation

2010

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Abstract:The Efate Pumice Formation (EPF) is a trachydacitic volcaniclastic succession widespread in the central part of Efate Island and also present on Hat and Lelepa islands to the north. The volcanic succession has been inferred to result from a major, entirely subaqueous explosive event north of Efate Island. The accumulated pumice-rich units were previously interpreted to be subaqueous pyroclastic density current deposits on the basis of their bedding, componentry and stratigraphic characteristics. Here we suggest an alternative eruptive scenario for this widespread succession. The major part of the EPF is distributed in central Efate, where pumiceous pyroclastic rock units several hundred meters thick are found within fault scarp cliffs elevated about 800 m above sea level. The basal 200 m of the pumiceous succession is composed of massive to weakly bedded pumiceous lapilli units, each 2-3 m thick. This succession is interbedded with wavy, undulatory and dune bedded pumiceous ash and fine lapilli units with characteristics of co-ignimbrite surges and ground surges. The presence of the surge beds implies that the intervening units comprise a subaerial ignimbritedominated succession. There are no sedimentary indicators in the basal units examined that are consistent with water-supported transportation and/or deposition. The subaerial ignimbrite sequence of the EPF is overlain by a shallow marine volcaniclastic Rentanbau Tuffs. The EPF is topped by reef limestone, which presumably preserved the underlying EPF from erosion. We here propose that the EPF was formed by a combination of initial subaerial ignimbrite-forming eruptions, followed by caldera subsidence. The upper volcaniclastic successions in our model represent intra-caldera pumiceous volcaniclastic deposits accumulated in a shallow marine environment in the resultant caldera. The present day elevated position of the succession is a result of a combination of possible caldera resurgence and ongoing arc-related uplift in the region.

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Water-settling and resedimentation of submarine rhyolitic pumice at Yali, eastern Aegean, Greece

Cited by 79 publications

References 36 publications

Effects of water depth on pumice formation in submarine domes at Sumisu, Izu-Bonin arc, western Pacific

Effects of water depth on pumice formation in submarine domes at Sumisu, Izu-Bonin arc, western Pacific

The petrologic evolution and pre-eruptive conditions of the rhyolitic Kos Plateau Tuff (Aegean arc)

Is Efate (Vanuatu, SW Pacific) a result of subaerial or submarine eruption? An alternative model for the 1 Ma Efate Pumice Formation

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