The magmatic plumbing of the submarine Hachijo NW volcanic chain, Hachijojima, Japan: Long‐distance magma transport?

Ishizuka, Osamu; Geshi, Nobuo; Itoh, Jun’ichi; Kawanabe, Yoshihisa; TuZino, Taqumi

doi:10.1029/2007jb005325

Cited by 35 publications

(44 citation statements)

References 53 publications

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“…In most other cases, the volcanism extends no further than 7.5 km west the main volcanoes. Similar flank volcanism toward the rear-arc in the Izu-Bonin arc is interpreted to result from lateral flow of magma in dykes away from the central volcanoes (Kaneko et al, 2005;Ishizuka et al, 2008).…”

Section: Seamount Cross-chains and Rear-arc Volcanismmentioning

confidence: 99%

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Leat

Day

Tate

et al. 2013

Journal of Volcanology and Geothermal Research

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New multibeam bathymetry data are presented for the South Sandwich intra-oceanic arc which occupies the small Sandwich plate in the South Atlantic, and is widely considered to be a simple end-member in the range of intra-oceanic arc types. The images show for the first time the distribution of submarine volcanic, tectonic and erosional-depositional features along the whole length of the 540 km long volcanic arc, allowing systematic investigation of along-arc variations. The data confirm that the volcanic arc has a simple structure composed of large volcanoes which form a well-defined volcanic front, but with three parallel crosscutting seamount chains extending 38-60 km from near the volcanic front into the rear-arc. There is no evidence for intra-arc rifting or extinct volcanic lines. Topographic evidence for faulting is generally absent, except near the northern and southern plate boundaries. Most of the volcanic arc appears to be built on ocean crust formed at the associated back-arc spreading centre, as previously proposed from magnetic data, but the southern part of the arc appears to be underlain by older arc or continental crust whose west-facing rifted margin facing the back-arc basin is defined by the new bathymetry. The new survey shows nine main volcanic edifices along the volcanic front and ca. 20 main seamounts. The main volcanoes form largely glaciated islands with summits 3.0-3.5 km above base levels which are 2500-3000 m deep in the north and shallower at 2000-2500 m deep in the south. Some of the component seamounts are interpreted to have been active since the last glacial maximum, and so are approximately contemporaneous with the volcanic front volcanism. Seven calderas, all either submarine or ice-filled, have been identified: Adventure volcano, a newly discovered submarine volcanic front caldera volcano is described for the first time. All but one of the calderas are situated on summits of large volcanoes in the southern part of the arc, and most are associated with current or historic volcanic or hydrothermal activity. Shallow shelves around the islands are generally 1-10 km wide. Submerged banks up to 1100 m deep are interpreted as subsided erosional surfaces. Seamounts and emergent volcanoes experienced a range of mass wasting processes including by landsliding and smaller mass flows. KeywordsVolcanic arc, subduction zone, caldera, seamount, submarine volcanism The importance of the South Sandwich volcanic arcThe South Sandwich volcanic arc, situated in the South Atlantic ( Fig. 1), is a tectonically simple, active, intra-oceanic arc, and is ideally suited to studies of volcanic arc crustal structure, geochemical investigation of mantle processes above a subduction zone, and sedimentation in an early stage of arc evolution. The active arc is built largely on oceanic crust of the small Sandwich plate which formed about 10 Ma at the back-arc East Scotia ridge spreading centre . The arc is forming in response to steeply inclined subduction of the South American plate beneath the Sand...

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Section: Seamount Cross-chains and Rear-arc Volcanismmentioning

confidence: 99%

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Leat

Day

Tate

et al. 2013

Journal of Volcanology and Geothermal Research

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“…1b, 2). These cones form chains aligned NW-SE, extending onto the submarine domain of the edifice and beyond, reaching 22 km NW and 15 km SE from the summit (Ishizuka et al, 2014). Details of the recent eruptive activity (younger than 1.7 ka) of these satellite cones are summarised in Ishizuka et al (2014).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…All the analytical work was conducted at Geological Survey of Japan/AIST. Analytical procedures for the geochemical analysis in this study are the same as reported in Ishizuka et al (2014), which were conducted in the same period. A detailed description of analytical procedures, and all the analytical data are included in the Supplementary data.…”

Section: Geochemistrymentioning

confidence: 99%

Progressive mixed-magma recharging of Izu-Oshima volcano, Japan: A guide to magma chamber volume

Ishizuka

Taylor

Geshi

et al. 2015

Earth and Planetary Science Letters

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“…The Izu-Oshima volcano, ∼60 km north of Miyakejima, also has volcanic chains on its flank trending in the WNW-ESE direction in the northwestern flank and in the NW-SE direction in the southeastern flank (Ishizuka et al, 2014). The Hachijojima volcano, ∼100 km south of Miyakejima, has volcanic chains trending in the NW-SE direction (Ishizuka et al, 2008). A regional dike trending in the N45 • W direction intruded the submarine area between Miyakejima Island and Kozushima Island during the 2000 AD eruption ( Figure 1A: Ito and Yoshida, 2002;Yamaoka et al, 2005).…”

Section: Background Of Miyakejima Tectonic Settingmentioning

confidence: 99%

Orientation of the Eruption Fissures Controlled by a Shallow Magma Chamber in Miyakejima

Geshi

Oikawa

2016

Front. Earth Sci.

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Orientation of the eruption fissures and composition of the lavas of the Miyakejima volcano is indicative of the competitive processes of the regional tectonic stress and the local stress generated by the activity of a magma plumbing system beneath the volcano. We examined the distributions and magmatic compositions of 23 fissures that formed within the last 2800 years, based on a field survey and a new dataset of 14 C ages. The dominant orientation of the eruption fissures in the central portion of the volcano was found to be NE-SW, which is perpendicular to the direction of regional maximum horizontal compressive stress (σ Hmax ). Magmas that show evidence of mixing between basaltic and andesitic compositions erupted mainly from the eruption fissures with a higher offset angle from the regional σ Hmax direction. The presence of a dike pattern perpendicular to the direction of maximum compression σ Hmax is an unusual and uncommon feature in volcanoes. Here we investigate the conditions possibly controlling this unexpected dike pattern. The distribution and magmatic compositions of the eruption fissures in Miyakejima volcano highlight the tectonic influence of shallow magma chamber on the development of feeder dikes in a composite volcano. The presence of a shallow dike-shaped magma chamber controls the eccentric distribution of the eruption fissures perpendicular to the present direction of σ Hmax . The injection of basaltic magma into the shallow andesitic magma chamber caused the temporal rise of internal magmatic pressure in the shallow magma chamber which elongates in NE-SW direction. Dikes extending from the andesitic magma chamber intrude along the local stress field which is generated by the internal excess pressure of the andesitic magma chamber. As the result, the eruption fissures trend parallel to the elongation direction of the shallow magma chamber. Some basaltic dikes from the deep-seated magma chamber reach the ground surface without intersection with the andesitic magma chamber. These basaltic dikes develop parallel to the regional compressive stress in NW-SE direction. The patterns of the eruption fissures can be modified in the future as was observed in the case of the destruction of the shallow magma chamber during the 2000 AD eruption.

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The magmatic plumbing of the submarine Hachijo NW volcanic chain, Hachijojima, Japan: Long‐distance magma transport?

Cited by 35 publications

References 53 publications

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry

Progressive mixed-magma recharging of Izu-Oshima volcano, Japan: A guide to magma chamber volume

Orientation of the Eruption Fissures Controlled by a Shallow Magma Chamber in Miyakejima

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