The Fukutoku Volcanic Complex: Implications for the northward extension of Mariana rifting and its tectonic controls on arc volcanism

Minami, Hiroki; Tani, Kazuo

doi:10.1016/j.margeo.2023.106996

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…(a) Total alkalis versus silica diagram showing the whole‐rock compositions of the dredged samples and literature data. The ranges of the previously collected rocks around FOB compiled by Minami and Tani (2023) are also shown. (b, c) Plots of selected trace element ratios versus SiO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Compositions were normalized to N‐MORB (Sun & McDonough, 1989). Y22a, Yoshida, Tamura, Sato, Hanyu, et al (2022); Y22b, Yoshida, Tamura, Sato, Sangmanee, et al (2022); M22, Maeno et al (2022); K88, Kato (1988); S98, Sun et al (1998); Y87, Yoshida et al (1987); MT23, Minami and Tani (2023).…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the studied dredged samples show low‐ and high‐SiO 2 compositions (61.0–62.5 and 63.5–64.5 mass%, respectively). Minami and Tani (2023) compiled rock compositions collected around FOB, suggesting that the inner caldera samples were mostly trachyte while mafic rocks were broadly recovered from the outward of the caldera. Most of the studied samples fell within the range of the previously reported range while the most SiO 2 ‐ and alkali‐rich samples of this study exceeds the range of previous reports (Figure 3a).…”

Section: Discussionmentioning

confidence: 99%

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The proximal volcaniclastic materials of Fukutoku‐Oka‐no‐Ba in the Izu‐Bonin arc show contrasting characteristics to the drift pumice of the 2021 eruption

Yoshida,

Tamura,

Sato

et al. 2023

Island Arc

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Fukutoku‐Oka‐no‐Ba is a submarine volcano located at 24°17.1′ N/141°28.9′ E in the Izu–Bonin arc, and is one of the most active volcanoes in Japan. This volcano produced an explosive eruption in August 2021 that generated a large amount of volcaniclastic material, some of which drifted westward to Japan and the coastal area of East Asia as a pumice raft. The pumice clasts that drifted for >1000 km were mostly homogeneous and identical to those produced by past historical eruptions. The clasts have trachytic compositions (SiO2 = 61–63 mass% and Na2O + K2O = 8.6–10.0 mass%) and contain augite, plagioclase, olivine (Mg# ~65), and magnetite, along with a small number of mafic enclaves containing diopside and high‐Mg olivine (Mg# ~ 92). We undertook a research cruise to investigate the proximal volcaniclastic materials by dredging. The proximal materials include pumice, weakly vesiculated lapilli, and volcanic blocks, which have trachytic composition (SiO2 contents up to 64.5 mass%). The main minerals in the proximal material are similar to those in the drift pumice, although remnants of mafic magma do not occur in the SiO2‐rich samples. The petrographic and geochemical characteristics of the proximal and drift ejecta from Fukutoku‐Oka‐no‐Ba suggest the magma reservoir was stratified into two parts. The major part experienced magma mixing with a limited volume of mafic magma, whereas the other part was more differentiated. The differentiated high‐SiO2 magma accumulated in the upper part of the magma reservoir and avoided the mixing with and feed of volatile from the mafic magma, then were pushed out from the volcanic vent without extensive bubbling to sunk in the proximal area.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The proximal volcaniclastic materials of Fukutoku‐Oka‐no‐Ba in the Izu‐Bonin arc show contrasting characteristics to the drift pumice of the 2021 eruption

Yoshida,

Tamura,

Sato

et al. 2023

Island Arc

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“…S1). FOB is one of the most active volcanoes in Japan and multiple eruptions producing pumice rafts have been recorded in the last hundred years (e.g., Tsuya, 1937;Kato, 1988;Ito et al, 2011;Minami and Tani, 2023). The latest eruption occurred on 13-15 August, 2021, and produced a large volume of pumice rafts that drifted to several locations in eastern Asia, including Japan, Taiwan, the Philippines, and Thailand (Yoshida et al, 2022a, b, c).…”

Section: Introductionmentioning

confidence: 99%

A cristobalite-bearing syenitic enclave in a drift pumice derived from the 2021 eruption of Fukutoku-Oka-no-Ba

YOSHIDA,

SAWADA,

MARUYA

et al. 2024

Journal of Mineralogical and Petrological Sciences

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The 2021 eruption of Fukutoku-Oka-no-Ba (FOB), which is a submarine volcano located at the southern end of the Izu-Ogasawara arc, produced a large number of pumice clasts that drifted to many places in the islands of Japan and eastern Asia. Amongst the typical gray pumice clasts, several peculiar clasts have been discovered, such as those with a black coloration and containing mafic enclaves. This study found a mostly bimineralic enclave consisting of plagioclase phenocrysts and an alkali feldspar matrix, with minor cristobalite, TiO2 minerals (anatase and rutile), and Fe sulfide. The chemical composition of the plagioclase phenocrysts is similar to that reported from the FOB pumice, and the tie line of the alkali feldspar and plagioclase in a Ca-Na-K ternary diagram indicates that they originated from melt extracted from the crystal mush of the FOB magma reservoir. The cristobalite occurs in the voids in the matrix, in which surrounding alkali feldspar compositions changed gradually along the ternary feldspar solvus of ~850 °C. The formation of a cristobalite-bearing bimineralic enclave can be explained by (1) the melt was extracted and accumulated at the shallow part of the magma reservoir, which crystallized as syenitic rocks; (2) subsequent degassing-related alteration within the volcanic conduit that caused plagioclase breakdown and cristobalite crystallization; and (3) entrainment of the syenitic rock fragment by the nanolite-bearing magma being erupted from the conduit.

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Minami-Ioto's Summit Covered with a Cloud

2023

Journal of Geography(Chigaku Zasshi)

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The Fukutoku Volcanic Complex: Implications for the northward extension of Mariana rifting and its tectonic controls on arc volcanism

Cited by 3 publications

References 42 publications

The proximal volcaniclastic materials of Fukutoku‐Oka‐no‐Ba in the Izu‐Bonin arc show contrasting characteristics to the drift pumice of the 2021 eruption

The proximal volcaniclastic materials of Fukutoku‐Oka‐no‐Ba in the Izu‐Bonin arc show contrasting characteristics to the drift pumice of the 2021 eruption

A cristobalite-bearing syenitic enclave in a drift pumice derived from the 2021 eruption of Fukutoku-Oka-no-Ba

Minami-Ioto's Summit Covered with a Cloud

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