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Long-distance magma transport from arc volcanoes inferred from the submarine eruptive fissures offshore Izu-Oshima volcano, Izu–Bonin arc

Long-distance magma transport from arc volcanoes inferred from the submarine eruptive fissures offshore Izu-Oshima volcano, Izu–Bonin arc
Long-distance magma transport from arc volcanoes inferred from the submarine eruptive fissures offshore Izu-Oshima volcano, Izu–Bonin arc
Long-distance lateral magma transport away from volcanic centers in island arcs is emerging as a common phenomenon where the regional stress regime is favorable. It should also be recognized as an important factor in the construction and growth of island arcs, and a potential trigger for devastating eruptions. In this contribution, we report on recent investigations into the magma dynamics of Izu-Oshima volcano, an active basaltic volcano with an extensive fissure system.

Izu-Oshima is flanked by numerous, subparallel NW–SE trending submarine ridges extending up to 22 km to the NW and the SE from the central vent. During a recent submersible survey we have identified that these ridges are fissures which erupted basaltic spatter and lava flows. Furthermore, lavas are petrographically similar along each ridge, while there are noticeable differences between ridges. The subparallel ridges are observed to transect a series of seamounts – the Izu-Tobu monogenetic volcanoes – which are dispersed across this area of the rear-arc. However, there are consistent petrographic and chemical differences between these seamounts and the ridges, indicating that they have different magma sources, yet, they are essentially bounding each other in dive tracks. The most appropriate scenario for their development is one where the Izu-Tobu Volcanoes are fed by an “in-situ” underlying source, while the NW–SE ridges are fed by lateral magma transport from Izu-Oshima.

Magma erupted from each ridge is of a consistent geochemistry along its length, but has experienced crystal fractionation and some plagioclase accumulation. Compositions of the ridges are also very similar to lavas from the subaerial cones that can be traced down the flanks of Izu-Oshima. This implies that pairs of subaerial cones and submarine ridges represent the locus of magma transport events away from the storage system beneath Izu-Oshima. Hence, magma from this crustal reservoir moved upward to feed the on-edifice cones, as well as laterally to supply submarine fissures and dykes to a distance of 22 km.
Lateral magma transport, Izu-Oshima, Satellite cone, Arc volcano, Submarine volcano
0377-0273
1-17
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Geshi, Nobuo
0974d7ec-3252-41ca-b2b7-ba9c5c2a2067
Kawanabe, Yoshihisa
176559a2-8852-48af-ae0d-0c2f95e506e6
Ogitsu, Itaru
b9435704-c312-46f8-af9d-65b662e7415d
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Tuzino, Taqumi
5dea9f20-ec2b-44b9-a26a-30611a3d0870
Sakamoto, Izumi
ebce0c5b-94dc-47e3-a107-243672ed9dfc
Arai, Kohsaku
73c4c27d-d07a-41d3-ad65-5133da3973b8
Nakano, Shun
65071bb7-ce02-42c8-9281-1255da8f2ccb
Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Geshi, Nobuo
0974d7ec-3252-41ca-b2b7-ba9c5c2a2067
Kawanabe, Yoshihisa
176559a2-8852-48af-ae0d-0c2f95e506e6
Ogitsu, Itaru
b9435704-c312-46f8-af9d-65b662e7415d
Taylor, Rex N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Tuzino, Taqumi
5dea9f20-ec2b-44b9-a26a-30611a3d0870
Sakamoto, Izumi
ebce0c5b-94dc-47e3-a107-243672ed9dfc
Arai, Kohsaku
73c4c27d-d07a-41d3-ad65-5133da3973b8
Nakano, Shun
65071bb7-ce02-42c8-9281-1255da8f2ccb

Ishizuka, Osamu, Geshi, Nobuo, Kawanabe, Yoshihisa, Ogitsu, Itaru, Taylor, Rex N., Tuzino, Taqumi, Sakamoto, Izumi, Arai, Kohsaku and Nakano, Shun (2014) Long-distance magma transport from arc volcanoes inferred from the submarine eruptive fissures offshore Izu-Oshima volcano, Izu–Bonin arc. Journal of Volcanology and Geothermal Research, 285, 1-17. (doi:10.1016/j.jvolgeores.2014.08.006).

Record type: Article

Abstract

Long-distance lateral magma transport away from volcanic centers in island arcs is emerging as a common phenomenon where the regional stress regime is favorable. It should also be recognized as an important factor in the construction and growth of island arcs, and a potential trigger for devastating eruptions. In this contribution, we report on recent investigations into the magma dynamics of Izu-Oshima volcano, an active basaltic volcano with an extensive fissure system.

Izu-Oshima is flanked by numerous, subparallel NW–SE trending submarine ridges extending up to 22 km to the NW and the SE from the central vent. During a recent submersible survey we have identified that these ridges are fissures which erupted basaltic spatter and lava flows. Furthermore, lavas are petrographically similar along each ridge, while there are noticeable differences between ridges. The subparallel ridges are observed to transect a series of seamounts – the Izu-Tobu monogenetic volcanoes – which are dispersed across this area of the rear-arc. However, there are consistent petrographic and chemical differences between these seamounts and the ridges, indicating that they have different magma sources, yet, they are essentially bounding each other in dive tracks. The most appropriate scenario for their development is one where the Izu-Tobu Volcanoes are fed by an “in-situ” underlying source, while the NW–SE ridges are fed by lateral magma transport from Izu-Oshima.

Magma erupted from each ridge is of a consistent geochemistry along its length, but has experienced crystal fractionation and some plagioclase accumulation. Compositions of the ridges are also very similar to lavas from the subaerial cones that can be traced down the flanks of Izu-Oshima. This implies that pairs of subaerial cones and submarine ridges represent the locus of magma transport events away from the storage system beneath Izu-Oshima. Hence, magma from this crustal reservoir moved upward to feed the on-edifice cones, as well as laterally to supply submarine fissures and dykes to a distance of 22 km.

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More information

Published date: 15 September 2014
Keywords: Lateral magma transport, Izu-Oshima, Satellite cone, Arc volcano, Submarine volcano
Organisations: Geochemistry

Identifiers

Local EPrints ID: 372352
URI: http://eprints.soton.ac.uk/id/eprint/372352
ISSN: 0377-0273
PURE UUID: abd189aa-9862-43fc-b64c-4b790dcefb02
ORCID for Rex N. Taylor: ORCID iD orcid.org/0000-0002-9367-0294

Catalogue record

Date deposited: 01 Dec 2014 14:12
Last modified: 22 Mar 2022 02:34

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Contributors

Author: Osamu Ishizuka
Author: Nobuo Geshi
Author: Yoshihisa Kawanabe
Author: Itaru Ogitsu
Author: Rex N. Taylor ORCID iD
Author: Taqumi Tuzino
Author: Izumi Sakamoto
Author: Kohsaku Arai
Author: Shun Nakano

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