Evolution of the 120 ka caldera-forming eruption of Kutcharo volcano, eastern Hokkaido, Japan: Geologic and petrologic evidence for multiple vent systems and rapid generation of pyroclastic flow

Hasegawa, Takeshi; Matsumoto, Akiko; Nakagawa, Mitsuhiro

doi:10.1016/j.jvolgeores.2016.04.030

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…The eruption could be phreatoplinian, as unit 1 seems to be widely dispersed. Initial phreatomagmatic fallout ash has also been reported from other caldera-forming eruptions: the 1875 eruption of Askja volcano in Iceland (Self and Sparks, 1978;Sparks et al, 1981;Carey et al, 2010) , the 1.8 ka Taupo eruption in New Zealand (Houghton et al, 2010) , the 161 ka Kos Plateau Tuff in eastern Aegean Sea (Allen, 2001) , and the 120 ka eruption at Kutcharo caldera in Japan (Hasegawa et al, 2016) . Unit 2a is a base surge deposit consisting mainly of fine-grained ash and containing accretionary lapilli, suggesting that it was produced by a phreatomagmatic eruption.…”

Section: )Stratigraphy Of the Toya Ignimbritementioning

confidence: 68%

“…Previous geological studies of large-volume pyroclastic deposits (e.g., Barberi et al, 1978;Self and Sparks, 1978;Bacon, 1983;Aramaki, 1984;Sparks et al, 1985;Self et al, 1986;Bacon and Druitt, 1988;Orsi et al, 1992;Allen and Cas, 1998;Allen, 2001;Milner et al, 2003;de Silva et al, 2006;Hildreth and Wilson, 2007;Maeno and Taniguchi, 2007;Carey et al, 2009Carey et al, , 2010Houghton et al, 2010;Hasegawa et al, 2016) suggest that caldera-forming eruptions vary in eruption style, intensity, and degree of interaction with external water. As the rarity of caldera-forming eruptions, the processes leading to caldera formation remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy and Lithofacies of the Toya Ignimbrite in Southwestern Hokkaido, Japan: Insights into the Caldera-forming Eruption at Toya Caldera

Goto

Suzuki

Shinya

et al. 2018

Journal of Geography(Chigaku Zasshi)

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A stratigraphic study of the Toya Ignimbrite in southwestern Hokkaido, Japan, was performed to clarify the sequence of caldera-forming eruption at Toya caldera. The Toya Ignimbrite (thickness < 80 m) is rhyolitic in composition and comprises six stratigraphic units: (1) a finegrained ash-fall deposit at the base; (2) a base surge deposit and an overlying, voluminous, pumiceous pyroclastic flow deposit, both of which contain accretionary lapilli; (3) a number of base surge deposits and associated ash-fall deposits; (4) a pumiceous pyroclastic flow deposit that contains large lithic clasts up to 50 cm in diameter; (5) a pumiceous pyroclastic flow deposit with a basal lithic-rich layer (lag breccia) ; and (6) a pumiceous pyroclastic flow deposit at the top. The stratigraphy suggests that the caldera-forming eruption at Toya caldera commenced with a phreatomagmatic explosive eruption (forming unit 1) , followed by violent phreatomagmatic eruptions that generated a voluminous pyroclastic flow (unit 2) , and small-scale phreatomagmatic eruptions that generated a number of base surges (unit 3). The next phreatomagmatic eruption triggered caldera collapse (unit 4) , which reached the climax with a violent phreatomagmatic eruption (unit 5) and ended with a magmatic eruption (unit 6). These eruptions occurred continuously without any significant time breaks. Component analysis of non-juvenile lithic clasts suggests that the vent-opening phase of the caldera-forming eruption involved a single vent. Pyroclastic flows during the caldera collapse may have erupted from multiple vents. Textural studies of pumice clasts suggest that white pumice was ejected during the initial to final stages, while banded pumice and grey pumice were ejected during the final stage. Geochemical data indicate that there was no significant change in magma composition during the caldera-forming eruption, with the exception of a small amount of mafic magma was mixed into the rhyolitic magma during the final stage.

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Section: )Stratigraphy Of the Toya Ignimbritementioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Stratigraphy and Lithofacies of the Toya Ignimbrite in Southwestern Hokkaido, Japan: Insights into the Caldera-forming Eruption at Toya Caldera

Goto

Suzuki

Shinya

et al. 2018

Journal of Geography(Chigaku Zasshi)

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“…Katsui and Satoh, 1963;Hirose and Nakagawa, 1995;Goto et al, 2000;Hasegawa et al, 2011), during which time the activity peaked in ~115-120 ka (e.g. Machida and Arai, 2003) with an erupted volume of ~175 km 3 (Hasegawa et al, 2012;Hasegawa et al, 2016); this erupted volume has not been corrected to dense rock equivalent (DRE). The post-caldera period commenced at ~35 ka, after which time Atosanupuri and Nakajima volcanoes were formed at ~30-20 ka (e.g.…”

Section: Deformation Of the Kutcharo Caldera Eastern Hokkaidomentioning

confidence: 99%

Viscoelastic crustal deformation by magmatic intrusion: A case study in the Kutcharo caldera, eastern Hokkaido, Japan

Yamasaki

Kobayashi

Wright

et al. 2018

Journal of Volcanology and Geothermal Research

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“…; Maeno and Taniguchi, 2007;Hasegawa et al, 2016 noes of Shikotsu volcano. Opoppu area is located south of the Shikotsu volcano.…”

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confidence: 99%

Eruption Sequence of the 46 ka Caldera-forming Eruption of Shikotsu Volcano, Inferred from Stratigraphy of Proximal Deposits at South of Lake Shikotsu, Japan

Nakagawa

Amma-Miyasaka

Tomijima

et al. 2018

Journal of Geography (Chigaku Zasshi)

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Proximal pyroclastic deposits of the 46 ka caldera-forming eruption of Shikotsu volcano are investigated at new outcrops along the Opoppu river, south of the volcano. The deposits can be divided into 6 units, from A to F in ascending order, according to lithofacies, components, and time intervals. Based on the stratigraphy of the deposits, the sequence of the 46 ka Shikotsu eruption is revealed. Activity started with phreatomagmatic and phreatoplinian eruptions （Phase 1: Unit A） . The eruption style changed to magmatic without a time interval before the plinian eruption （Phase 2: Unit B） . The eruption column was intermittently unstable, producing pyroclastic surge and flow deposits during the latter period of Phase 2. The lithic breccia content also increased in the latter period. After a possible erosional interval, explosive eruptions occurred, producing voluminous pyroclastic flows and ended with the effusion of lag breccia （Phase 3: Unit C） . After a dormant period, pyroclastic flows effused intermittently （Phase 4: Units D and E） . At the final stage, small plinian eruption occurred, associated with a pyroclastic surge （Phase 5: Unit F） . Juvenile materials of the 46 ka Shikotsu eruption are mainly crystal-poor （CP type） rhyolite pumice from Phases 1 to 3. Small amounts of crystal-rich （CR type） dacite and andesite pumice occurred from the final stage of the Phase 3. Two types of silicic material coexisted during Phases 4 and 5. According to temporal changes of lithic contents, the caldera collapse was almost completed at the end of Phase 3 with the formation of lag breccia. Therefore, it could be considered that activity in Phases 4 and 5 was either the terminal phase of calderaforming activity or the initial activity of post-Shikotsu caldera volcanoes.

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Evolution of the 120 ka caldera-forming eruption of Kutcharo volcano, eastern Hokkaido, Japan: Geologic and petrologic evidence for multiple vent systems and rapid generation of pyroclastic flow

Cited by 14 publications

References 44 publications

Stratigraphy and Lithofacies of the Toya Ignimbrite in Southwestern Hokkaido, Japan: Insights into the Caldera-forming Eruption at Toya Caldera

Stratigraphy and Lithofacies of the Toya Ignimbrite in Southwestern Hokkaido, Japan: Insights into the Caldera-forming Eruption at Toya Caldera

Viscoelastic crustal deformation by magmatic intrusion: A case study in the Kutcharo caldera, eastern Hokkaido, Japan

Eruption Sequence of the 46 ka Caldera-forming Eruption of Shikotsu Volcano, Inferred from Stratigraphy of Proximal Deposits at South of Lake Shikotsu, Japan

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