A “rootless” serpentinite seamount on the southern Izu-Bonin forearc: implications for basal erosion at convergent plate margins
A “rootless” serpentinite seamount on the southern Izu-Bonin forearc: implications for basal erosion at convergent plate margins
We use multichannel seismic reflection (MCS) and gravity data from the southern Izu-Bonin convergent plate margin to test for tectonic erosion. The Hahajima Seamount is a serpentinite seamount on the Izu-Bonin forearc. This serpentinite body likely originated from the mantle wedge beneath the Izu-Bonin arc, but it subsequently detached. MCS data and gravity modeling demonstrate that the Ogasawara Plateau on the incoming Pacific plate has been partly subducted beneath the Hahajima Seamount. Our analysis indicates that the Hahajima Seamount is a “rootless” serpentinite seamount, and the “root” of the serpentinite body was eroded during subduction of the western edge of the Ogasawara Plateau. Structural features of the Hahajima Seamount, the Ogasawara Plateau, and the Philippine Sea plate suggest that tectonic erosion, particularly basal erosion, has been occurring throughout this area.
subduction, serpentinite seamount, seismic reflection data, gravity modeling, Izu-Bonin Trench, basal erosion
541-544
Miura, R.
eabce404-2b96-43f4-b1ef-58f41dfca812
Nakamura, Y.
e0f3fa39-599e-4a46-b7db-74c65ac2c66d
Koda, K.
0094a764-11c9-4338-b63d-3b967ebc577b
Tokuyama, H.
61c84b89-7a69-4de7-9f0e-28c9e2383960
Coffin, M.F.
b8285650-5efd-4129-ae91-1cf3f5911e89
June 2004
Miura, R.
eabce404-2b96-43f4-b1ef-58f41dfca812
Nakamura, Y.
e0f3fa39-599e-4a46-b7db-74c65ac2c66d
Koda, K.
0094a764-11c9-4338-b63d-3b967ebc577b
Tokuyama, H.
61c84b89-7a69-4de7-9f0e-28c9e2383960
Coffin, M.F.
b8285650-5efd-4129-ae91-1cf3f5911e89
Miura, R., Nakamura, Y., Koda, K., Tokuyama, H. and Coffin, M.F.
(2004)
A “rootless” serpentinite seamount on the southern Izu-Bonin forearc: implications for basal erosion at convergent plate margins.
Geology, 32 (6), .
(doi:10.1130/G20319.1).
Abstract
We use multichannel seismic reflection (MCS) and gravity data from the southern Izu-Bonin convergent plate margin to test for tectonic erosion. The Hahajima Seamount is a serpentinite seamount on the Izu-Bonin forearc. This serpentinite body likely originated from the mantle wedge beneath the Izu-Bonin arc, but it subsequently detached. MCS data and gravity modeling demonstrate that the Ogasawara Plateau on the incoming Pacific plate has been partly subducted beneath the Hahajima Seamount. Our analysis indicates that the Hahajima Seamount is a “rootless” serpentinite seamount, and the “root” of the serpentinite body was eroded during subduction of the western edge of the Ogasawara Plateau. Structural features of the Hahajima Seamount, the Ogasawara Plateau, and the Philippine Sea plate suggest that tectonic erosion, particularly basal erosion, has been occurring throughout this area.
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Published date: June 2004
Keywords:
subduction, serpentinite seamount, seismic reflection data, gravity modeling, Izu-Bonin Trench, basal erosion
Identifiers
Local EPrints ID: 52443
URI: http://eprints.soton.ac.uk/id/eprint/52443
ISSN: 0091-7613
PURE UUID: da5e7666-c582-4d4b-8bea-fb87f8c41504
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Date deposited: 26 Jun 2008
Last modified: 15 Mar 2024 10:37
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Contributors
Author:
R. Miura
Author:
Y. Nakamura
Author:
K. Koda
Author:
H. Tokuyama
Author:
M.F. Coffin
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