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Origin and age of magmatism in the Northern Philippine Sea basins

Origin and age of magmatism in the Northern Philippine Sea basins
Origin and age of magmatism in the Northern Philippine Sea basins
A Robust tectonic reconstruction of the Philippine Sea Plate around ∼52 Ma is a prerequisite in understanding the process of subduction initiation and establishment of the Izu-Bonin-Mariana arc. This study investigates origins and timing of basin formation in the still poorly understood oldest part of the northern Philippine Sea plate. We have established that andesitic magmatism in the form of the Northern Philippine Sea volcanics is widely distributed across this area. It is founded on both a Mesozoic arc terrane (Daito Ridge Group) and an intervening basin (Kita-Daito Basin). Their narrow Eocene age range (45-41 Ma) and lack of systematic spatial variation in geochemistry implies that this magmatism was not associated with on-going subduction, but related to the rifting/spreading event forming the Kita-Daito Basin. The arc-like geochemistry of the volcanics seems to indicate melting of lithospheric mantle which had been previously metasomatized by Mesozoic subduction of a plate with Pacific-MORB isotopic characteristics. Late Eocene basaltic magmatism also found in the Kita-Daito Basin does not have arc-like characteristics, and could have formed from low-degree melts of asthenospheric mantle associated with the final stage of Kita-Daito Basin spreading. As onset of activity of the Northern Philippine Sea volcanics is essentially synchronous with the magmatism associated with the Oki-Daito mantle plume, it is possible that both magmatism and rifting of the Kita-Daito Basin were triggered by the arrival of the Oki-Daito mantle plume in this region. These results demonstrate that the Kita-Daito Basin postdates subduction initiation of the Pacific Plate along the Izu-Bonin-Mariana arc.
Kita-Daito Basin, Philippine Sea, rifting, subduction initiation
1525-2027
Ishizuka, Osamu
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Tani, Kenichiro
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Taylor, Rex N
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Umino, Susumu
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Sakamoto, Izumi
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Yokoyama, Yuka
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Shimoda, Gen
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Harigane, Yumiko
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Ohara, Yasuhiko
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Conway, Chris E.
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Perez, Americus
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Sekimoto, Shun
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Ishizuka, Osamu
1fb98a88-bff7-4200-a09d-92ddf1616058
Tani, Kenichiro
3aaca9a9-6de3-4938-a853-ea07210a918b
Taylor, Rex N
094be7fd-ef61-4acd-a795-7daba2bc6183
Umino, Susumu
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Sakamoto, Izumi
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Yokoyama, Yuka
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Shimoda, Gen
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Harigane, Yumiko
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Ohara, Yasuhiko
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Conway, Chris E.
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Perez, Americus
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Sekimoto, Shun
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Ishizuka, Osamu, Tani, Kenichiro, Taylor, Rex N, Umino, Susumu, Sakamoto, Izumi, Yokoyama, Yuka, Shimoda, Gen, Harigane, Yumiko, Ohara, Yasuhiko, Conway, Chris E., Perez, Americus and Sekimoto, Shun (2022) Origin and age of magmatism in the Northern Philippine Sea basins. Geochemistry, Geophysics, Geosystems, 23 (4), [e2021GC010242]. (doi:10.1029/2021GC010242).

Record type: Article

Abstract

A Robust tectonic reconstruction of the Philippine Sea Plate around ∼52 Ma is a prerequisite in understanding the process of subduction initiation and establishment of the Izu-Bonin-Mariana arc. This study investigates origins and timing of basin formation in the still poorly understood oldest part of the northern Philippine Sea plate. We have established that andesitic magmatism in the form of the Northern Philippine Sea volcanics is widely distributed across this area. It is founded on both a Mesozoic arc terrane (Daito Ridge Group) and an intervening basin (Kita-Daito Basin). Their narrow Eocene age range (45-41 Ma) and lack of systematic spatial variation in geochemistry implies that this magmatism was not associated with on-going subduction, but related to the rifting/spreading event forming the Kita-Daito Basin. The arc-like geochemistry of the volcanics seems to indicate melting of lithospheric mantle which had been previously metasomatized by Mesozoic subduction of a plate with Pacific-MORB isotopic characteristics. Late Eocene basaltic magmatism also found in the Kita-Daito Basin does not have arc-like characteristics, and could have formed from low-degree melts of asthenospheric mantle associated with the final stage of Kita-Daito Basin spreading. As onset of activity of the Northern Philippine Sea volcanics is essentially synchronous with the magmatism associated with the Oki-Daito mantle plume, it is possible that both magmatism and rifting of the Kita-Daito Basin were triggered by the arrival of the Oki-Daito mantle plume in this region. These results demonstrate that the Kita-Daito Basin postdates subduction initiation of the Pacific Plate along the Izu-Bonin-Mariana arc.

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Ishizuka et al 2022 G3 Origin and Age of Magmatism in the Northern Philippine Sea Basins - Version of Record
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Accepted/In Press date: 15 March 2022
Published date: 8 April 2022
Additional Information: Funding Information: Part of this study was conducted under the project entitled Basic Researches on Exploration Technologies for Deep Sea Natural Resources, which is commissioned to JOGMEC by METI. We thank METI for approving publication of the data. We thank the officers, crews, and onboard scientists of the R/V Hakurei-maru No. 2, R/V Yokosuka, R/V Hakuho maru and R/V Shinsei maru, and submersible pilots of Shinkai 6500. We would like to thank K. Yamanobe for preparation of glass beads and assistance with the ICP-MS measurements. We appreciate A. Owada, T. Sato and E. Hirabayashi for preparation of thin sections. We also thank T. Sasaki, T. Shimono, A. Tokumoto, and H. Nagato for helping preparation of rock powder, and N. Geshi and Y. Ishizuka for the maintenance of XRF at GSJ-lab. We appreciate M. Narui and M. Yamazaki at IMR, Tohoku University, and Oregon State University for neutron irradiation. We would like to thank R. Okumura, H. Yoshinaga,Y. Iinuma for irradiation of dated samples at KUR, Institute for Integrated Radiation and Nuclear Science, Kyoto University. This work was supported by JSPS KAKENHI Grant Nos. JP17K05686, JP25287133, and JP21H01183, and JSPS bilateral grant (Japan-UK) for OI. The authors acknowledge the constructive reviews by Michael Bizimis, Maryjo Brounce, and 2 anonymous reviewers and helpful editorial comments by Janne Blichert-Toft. Funding Information: Part of this study was conducted under the project entitled Basic Researches on Exploration Technologies for Deep Sea Natural Resources, which is commissioned to JOGMEC by METI. We thank METI for approving publication of the data. We thank the officers, crews, and onboard scientists of the R/V , R/V and R/V , and submersible pilots of . We would like to thank K. Yamanobe for preparation of glass beads and assistance with the ICP‐MS measurements. We appreciate A. Owada, T. Sato and E. Hirabayashi for preparation of thin sections. We also thank T. Sasaki, T. Shimono, A. Tokumoto, and H. Nagato for helping preparation of rock powder, and N. Geshi and Y. Ishizuka for the maintenance of XRF at GSJ‐lab. We appreciate M. Narui and M. Yamazaki at IMR, Tohoku University, and Oregon State University for neutron irradiation. We would like to thank R. Okumura, H. Yoshinaga,Y. Iinuma for irradiation of dated samples at KUR, Institute for Integrated Radiation and Nuclear Science, Kyoto University. This work was supported by JSPS KAKENHI Grant Nos. JP17K05686, JP25287133, and JP21H01183, and JSPS bilateral grant (Japan‐UK) for OI. The authors acknowledge the constructive reviews by Michael Bizimis, Maryjo Brounce, and 2 anonymous reviewers and helpful editorial comments by Janne Blichert‐Toft. Hakurei‐maru No. 2 Yokosuka, R/V Hakuho maru Shinsei maru Shinkai 6500 Publisher Copyright: © 2022. The Authors.
Keywords: Kita-Daito Basin, Philippine Sea, rifting, subduction initiation

Identifiers

Local EPrints ID: 456807
URI: http://eprints.soton.ac.uk/id/eprint/456807
ISSN: 1525-2027
PURE UUID: 6cc2fae1-3f6e-4394-9121-78474d9901e5
ORCID for Rex N Taylor: ORCID iD orcid.org/0000-0002-9367-0294

Catalogue record

Date deposited: 11 May 2022 16:51
Last modified: 17 Mar 2024 02:43

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Contributors

Author: Osamu Ishizuka
Author: Kenichiro Tani
Author: Rex N Taylor ORCID iD
Author: Susumu Umino
Author: Izumi Sakamoto
Author: Yuka Yokoyama
Author: Gen Shimoda
Author: Yumiko Harigane
Author: Yasuhiko Ohara
Author: Chris E. Conway
Author: Americus Perez
Author: Shun Sekimoto

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