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'Rootless' serpentinite seamount on the southern Izu-Bonin forearc: implications for basal erosion at convergent plate margins

journal contribution
posted on 2023-05-17, 08:39 authored by Miura, R, Nakamura, Y, Koda, K, Tokuyama, H, Mike CoffinMike Coffin
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.

History

Publication title

Geology (Boulder)

Volume

32

Issue

6

Pagination

541-544

ISSN

0091-7613

Department/School

Institute for Marine and Antarctic Studies

Publisher

Geological Soc America

Place of publication

Inc, Po Box 9140, Boulder, USA, Co, 80301-9140

Rights statement

Copyright © 2004 Geological Society of America

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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