Articles | Volume 11, issue 1
https://doi.org/10.5194/se-11-23-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-11-23-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting
Tomoaki Morishita
CORRESPONDING AUTHOR
Faculty of Geosciences and Civil Engineering, Kanazawa University,
Kanazawa 920-1192, Japan
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY
10964, USA
Volcanoes and Earth's Interior Research Center, Japan Agency for
Marine-Earth Science and Technology, 2–15 Natsushima, Kanagawa, 237-0061,
Japan
Naoto Hirano
Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi,
Aoba-ku, Sendai 980-8576, Japan
Hirochika Sumino
Graduate School of Arts and Sciences, University of Tokyo, 3-8-1
Komaba, Meguro-ku, Tokyo 153-0041, Japan
Hiroshi Sato
Department of Business Administration, Senshu University, 2-1-1,
Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8580, Japan
Tomoyuki Shibata
Department of Earth and Planetary Systems Science, Graduate School of
Science, Hiroshima University,
1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan
Masako Yoshikawa
Department of Earth and Planetary Systems Science, Graduate School of
Science, Hiroshima University,
1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan
Shoji Arai
School of Natural System, Kanazawa University, Kanazawa 920-1192,
Japan
Rie Nauchi
School of Natural System, Kanazawa University, Kanazawa 920-1192,
Japan
Akihiro Tamura
School of Natural System, Kanazawa University, Kanazawa 920-1192,
Japan
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Short summary
We report a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in the northeast Tsushima Basin, southwest Sea of Japan, which is one of the western Pacific back-arc basin swarms. An 40Ar / 39Ar plateau age of 8.33 ± 0.15 Ma (2 σ) was obtained for the SSM basalt, indicating that it erupted shortly after the termination of back-arc spreading. The SSM basalt was formed in a post-back-arc extension setting by the low-degree partial melting of an upwelling asthenosphere.
We report a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in...