Missing western half of the Pacific Plate

Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

Takashi Miyazaki, Jun Ichi Kimura, Ryoko Senda, Bogdan S. Vaglarov, Qing Chang, Toshiro Takahashi, Yuka Hirahara, Folkmar Hauff, Yasutaka Hayasaka, Sakae Sano, Gen Shimoda, Osamu Ishizuka, Hiroshi Kawabata, Naoto Hirano, Shiki Machida, Teruaki Ishii, Kenichiro Tani, Takeyoshi Yoshida

研究成果: ジャーナルへの寄稿記事

15 引用 (Scopus)

抄録

The source mantle of the basaltic ocean crust on the western half of the Pacific Plate was examined using Pb-Nd-Hf isotopes. The results showed that the subducted Izanagi-Pacific Ridge (IPR) formed from both Pacific (180-∼80 Ma) and Indian (∼80-70 Ma) mantles. The western Pacific Plate becomes younger westward and is thought to have formed from the IPR. The ridge was subducted along the Kurile-Japan-Nankai-Ryukyu (KJNR) Trench at 60-55 Ma and leading edge of the Pacific Plate is currently stagnated in the mantle transition zone. Conversely, the entire eastern half of the Pacific Plate, formed from isotopically distinct Pacific mantle along the East Pacific Rise and the Juan de Fuca Ridge, largely remains on the seafloor. The subducted IPR is inaccessible; therefore, questions regarding which mantle might be responsible for the formation of the western half of the Pacific Plate remain controversial. Knowing the source of the IPR basalts provides insight into the Indian-Pacific mantle boundary before the Cenozoic. Isotopic compositions of the basalts from borehole cores (165-130 Ma) in the western Pacific show that the surface oceanic crust is of Pacific mantle origin. However, the accreted ocean floor basalts (∼80-70 Ma) in the accretionary prism along the KJNR Trench have Indian mantle signatures. This indicates the younger western Pacific Plate of IPR origin formed partly from Indian mantle and that the Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous. Key Points: The isotope geochemistry of the western Pacific Plate slab is reported The Pacific Plate originated from both Indian and Pacific mantle The Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous.

元の言語英語
ページ(範囲)3309-3332
ページ数24
ジャーナルGeochemistry, Geophysics, Geosystems
16
発行部数9
DOI
出版物ステータス出版済み - 9 1 2015

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Pacific plate
ridges
Earth mantle
mantle
Isotopes
Geochemistry
interactions
Prisms
Boreholes
basalt
Chemical analysis
trench
seafloor
crusts
Japan
oceans
isotope
isotopes
Cretaceous
accretionary prism

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Missing western half of the Pacific Plate : Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles. / Miyazaki, Takashi; Kimura, Jun Ichi; Senda, Ryoko; Vaglarov, Bogdan S.; Chang, Qing; Takahashi, Toshiro; Hirahara, Yuka; Hauff, Folkmar; Hayasaka, Yasutaka; Sano, Sakae; Shimoda, Gen; Ishizuka, Osamu; Kawabata, Hiroshi; Hirano, Naoto; Machida, Shiki; Ishii, Teruaki; Tani, Kenichiro; Yoshida, Takeyoshi.

:: Geochemistry, Geophysics, Geosystems, 巻 16, 番号 9, 01.09.2015, p. 3309-3332.

研究成果: ジャーナルへの寄稿記事

Miyazaki, T, Kimura, JI, Senda, R, Vaglarov, BS, Chang, Q, Takahashi, T, Hirahara, Y, Hauff, F, Hayasaka, Y, Sano, S, Shimoda, G, Ishizuka, O, Kawabata, H, Hirano, N, Machida, S, Ishii, T, Tani, K & Yoshida, T 2015, 'Missing western half of the Pacific Plate: Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles', Geochemistry, Geophysics, Geosystems, 巻. 16, 番号 9, pp. 3309-3332. https://doi.org/10.1002/2015GC005911
Miyazaki, Takashi ; Kimura, Jun Ichi ; Senda, Ryoko ; Vaglarov, Bogdan S. ; Chang, Qing ; Takahashi, Toshiro ; Hirahara, Yuka ; Hauff, Folkmar ; Hayasaka, Yasutaka ; Sano, Sakae ; Shimoda, Gen ; Ishizuka, Osamu ; Kawabata, Hiroshi ; Hirano, Naoto ; Machida, Shiki ; Ishii, Teruaki ; Tani, Kenichiro ; Yoshida, Takeyoshi. / Missing western half of the Pacific Plate : Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles. :: Geochemistry, Geophysics, Geosystems. 2015 ; 巻 16, 番号 9. pp. 3309-3332.
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title = "Missing western half of the Pacific Plate: Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles",
abstract = "The source mantle of the basaltic ocean crust on the western half of the Pacific Plate was examined using Pb-Nd-Hf isotopes. The results showed that the subducted Izanagi-Pacific Ridge (IPR) formed from both Pacific (180-∼80 Ma) and Indian (∼80-70 Ma) mantles. The western Pacific Plate becomes younger westward and is thought to have formed from the IPR. The ridge was subducted along the Kurile-Japan-Nankai-Ryukyu (KJNR) Trench at 60-55 Ma and leading edge of the Pacific Plate is currently stagnated in the mantle transition zone. Conversely, the entire eastern half of the Pacific Plate, formed from isotopically distinct Pacific mantle along the East Pacific Rise and the Juan de Fuca Ridge, largely remains on the seafloor. The subducted IPR is inaccessible; therefore, questions regarding which mantle might be responsible for the formation of the western half of the Pacific Plate remain controversial. Knowing the source of the IPR basalts provides insight into the Indian-Pacific mantle boundary before the Cenozoic. Isotopic compositions of the basalts from borehole cores (165-130 Ma) in the western Pacific show that the surface oceanic crust is of Pacific mantle origin. However, the accreted ocean floor basalts (∼80-70 Ma) in the accretionary prism along the KJNR Trench have Indian mantle signatures. This indicates the younger western Pacific Plate of IPR origin formed partly from Indian mantle and that the Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous. Key Points: The isotope geochemistry of the western Pacific Plate slab is reported The Pacific Plate originated from both Indian and Pacific mantle The Indian-Pacific mantle boundary has been stationary in the western Pacific at least since the Cretaceous.",
author = "Takashi Miyazaki and Kimura, {Jun Ichi} and Ryoko Senda and Vaglarov, {Bogdan S.} and Qing Chang and Toshiro Takahashi and Yuka Hirahara and Folkmar Hauff and Yasutaka Hayasaka and Sakae Sano and Gen Shimoda and Osamu Ishizuka and Hiroshi Kawabata and Naoto Hirano and Shiki Machida and Teruaki Ishii and Kenichiro Tani and Takeyoshi Yoshida",
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T2 - Geochemical nature of the Izanagi-Pacific Ridge interaction with a stationary boundary between the Indian and Pacific mantles

AU - Miyazaki, Takashi

AU - Kimura, Jun Ichi

AU - Senda, Ryoko

AU - Vaglarov, Bogdan S.

AU - Chang, Qing

AU - Takahashi, Toshiro

AU - Hirahara, Yuka

AU - Hauff, Folkmar

AU - Hayasaka, Yasutaka

AU - Sano, Sakae

AU - Shimoda, Gen

AU - Ishizuka, Osamu

AU - Kawabata, Hiroshi

AU - Hirano, Naoto

AU - Machida, Shiki

AU - Ishii, Teruaki

AU - Tani, Kenichiro

AU - Yoshida, Takeyoshi

PY - 2015/9/1

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