Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting
<p>We present geochemical and <span class="inline-formula"><sup>40</sup>Ar∕<sup>39</sup>Ar</span> age data for a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in the northeast Tsushima Basin, southwest Sea of Japan...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-01-01
|
| Series: | Solid Earth |
| Online Access: | https://www.solid-earth.net/11/23/2020/se-11-23-2020.pdf |
| _version_ | 1817976905467428864 |
|---|---|
| author | T. Morishita T. Morishita T. Morishita N. Hirano H. Sumino H. Sato T. Shibata M. Yoshikawa S. Arai R. Nauchi A. Tamura |
| author_facet | T. Morishita T. Morishita T. Morishita N. Hirano H. Sumino H. Sato T. Shibata M. Yoshikawa S. Arai R. Nauchi A. Tamura |
| author_sort | T. Morishita |
| collection | DOAJ |
| description | <p>We present geochemical and <span class="inline-formula"><sup>40</sup>Ar∕<sup>39</sup>Ar</span> age data
for a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM
basalt) in the northeast Tsushima Basin, southwest Sea of Japan. An
<span class="inline-formula"><sup>40</sup>Ar∕<sup>39</sup>Ar</span> plateau age of <span class="inline-formula">8.33±0.15</span> Ma (2<span class="inline-formula"><i>σ</i></span>) was
obtained for the SSM basalt, indicating that it erupted shortly after the
termination of back-arc spreading in the Sea of Japan. The SSM basalt is a
high-K to shoshonitic alkali basalt that is characterized by light rare
earth element enrichment. The trace element features of the basalt are
similar to those of ocean island basalt, although the Yb content is much
higher, indicating formation by the low-degree partial melting of spinel
peridotite. The Nd, Sr, and Pb isotopic compositions of the SSM basalt
differ from those of back-arc basin basalts in the Sea of Japan. The Sr–Nd
isotopic composition of the SSM basalt suggests its source was depleted
mid-ocean ridge mantle containing an enriched mantle (EM1) component. The SSM basalt was
formed in a post-back-arc extension setting by the low-degree partial melting of
an upwelling asthenosphere that had previously been associated with the main
phase of back-arc magmatism.</p> |
| first_indexed | 2024-04-13T22:09:04Z |
| format | Article |
| id | doaj.art-7b9624f786b04a82a10327d09362661f |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-04-13T22:09:04Z |
| publishDate | 2020-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-7b9624f786b04a82a10327d09362661f2022-12-22T02:27:49ZengCopernicus PublicationsSolid Earth1869-95101869-95292020-01-0111233610.5194/se-11-23-2020Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc settingT. Morishita0T. Morishita1T. Morishita2N. Hirano3H. Sumino4H. Sato5T. Shibata6M. Yoshikawa7S. Arai8R. Nauchi9A. Tamura10Faculty of Geosciences and Civil Engineering, Kanazawa University, Kanazawa 920-1192, JapanLamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USAVolcanoes and Earth's Interior Research Center, Japan Agency for Marine-Earth Science and Technology, 2–15 Natsushima, Kanagawa, 237-0061, JapanCenter for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai 980-8576, JapanGraduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-0041, JapanDepartment of Business Administration, Senshu University, 2-1-1, Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8580, JapanDepartment of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, JapanDepartment of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, JapanSchool of Natural System, Kanazawa University, Kanazawa 920-1192, JapanSchool of Natural System, Kanazawa University, Kanazawa 920-1192, JapanSchool of Natural System, Kanazawa University, Kanazawa 920-1192, Japan<p>We present geochemical and <span class="inline-formula"><sup>40</sup>Ar∕<sup>39</sup>Ar</span> age data for a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in the northeast Tsushima Basin, southwest Sea of Japan. An <span class="inline-formula"><sup>40</sup>Ar∕<sup>39</sup>Ar</span> plateau age of <span class="inline-formula">8.33±0.15</span> Ma (2<span class="inline-formula"><i>σ</i></span>) was obtained for the SSM basalt, indicating that it erupted shortly after the termination of back-arc spreading in the Sea of Japan. The SSM basalt is a high-K to shoshonitic alkali basalt that is characterized by light rare earth element enrichment. The trace element features of the basalt are similar to those of ocean island basalt, although the Yb content is much higher, indicating formation by the low-degree partial melting of spinel peridotite. The Nd, Sr, and Pb isotopic compositions of the SSM basalt differ from those of back-arc basin basalts in the Sea of Japan. The Sr–Nd isotopic composition of the SSM basalt suggests its source was depleted mid-ocean ridge mantle containing an enriched mantle (EM1) component. The SSM basalt was formed in a post-back-arc extension setting by the low-degree partial melting of an upwelling asthenosphere that had previously been associated with the main phase of back-arc magmatism.</p>https://www.solid-earth.net/11/23/2020/se-11-23-2020.pdf |
| spellingShingle | T. Morishita T. Morishita T. Morishita N. Hirano H. Sumino H. Sato T. Shibata M. Yoshikawa S. Arai R. Nauchi A. Tamura Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting Solid Earth |
| title | Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting |
| title_full | Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting |
| title_fullStr | Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting |
| title_full_unstemmed | Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting |
| title_short | Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting |
| title_sort | alkali basalt from the seifu seamount in the sea of japan post spreading magmatism in a back arc setting |
| url | https://www.solid-earth.net/11/23/2020/se-11-23-2020.pdf |
| work_keys_str_mv | AT tmorishita alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT tmorishita alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT tmorishita alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT nhirano alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT hsumino alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT hsato alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT tshibata alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT myoshikawa alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT sarai alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT rnauchi alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting AT atamura alkalibasaltfromtheseifuseamountintheseaofjapanpostspreadingmagmatisminabackarcsetting |