<sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province
Seamounts are features generated by hot spots and associated intraplate volcanic activity. The geochemical characteristics of igneous rocks constituting seamounts provide evidence of important details of dynamic processes in the Earth, such as mantle magma source areas, and are key to understanding...
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MDPI AG
2022-01-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/10/1/54 |
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| author | Qian Liu Limei Tang Ling Chen Peng Gao |
| author_facet | Qian Liu Limei Tang Ling Chen Peng Gao |
| author_sort | Qian Liu |
| collection | DOAJ |
| description | Seamounts are features generated by hot spots and associated intraplate volcanic activity. The geochemical characteristics of igneous rocks constituting seamounts provide evidence of important details of dynamic processes in the Earth, such as mantle magma source areas, and are key to understanding how mantle plume processes control the formation and evolution of seamounts and their resulting geochemical characteristics. The Pacific Ocean contains a large number of hitherto unstudied seamounts, whose ages and geochemical characteristics remain poorly known. This study presents the geochemical characteristics of six basalt samples from five seamounts in the Western Pacific and the <sup>40</sup>Ar/<sup>9</sup>Ar ages of three samples are determined. The new analysis yielded <sup>40</sup>Ar/<sup>39</sup>Ar ages for seamounts samples MP3D21, MP5D11, and MP5D15A of 95.43 ± 0.33, 62.4 ± 0.26, and 99.03 ± 0.4 Ma, respectively. The geochemical profiles of seamounts samples MP3D04, MP3D21, MP5D11, MP5D15A, MPID201, and MPID202 are consistent with alkaline basalts, as evidence by alkali-rich, silicon-poor compositions along with high titanium concentrations. The primitive mantle normalized rare-earth elements and trace elements spider pattern are similar to those of ocean island basalts. The Ta/Hf and Nb/Zr ratios and La/Zr-Nb/Zr discriminant diagrams indicate that the six seamounts formed from magma that originated in the deep mantle. |
| first_indexed | 2024-03-10T01:12:46Z |
| format | Article |
| id | doaj.art-f4937d34c9704e98bf79f582dc200984 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T01:12:46Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-f4937d34c9704e98bf79f582dc2009842023-11-23T14:16:14ZengMDPI AGJournal of Marine Science and Engineering2077-13122022-01-011015410.3390/jmse10010054<sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific ProvinceQian Liu0Limei Tang1Ling Chen2Peng Gao3Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, ChinaKey Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, ChinaKey Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, ChinaKey Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, ChinaSeamounts are features generated by hot spots and associated intraplate volcanic activity. The geochemical characteristics of igneous rocks constituting seamounts provide evidence of important details of dynamic processes in the Earth, such as mantle magma source areas, and are key to understanding how mantle plume processes control the formation and evolution of seamounts and their resulting geochemical characteristics. The Pacific Ocean contains a large number of hitherto unstudied seamounts, whose ages and geochemical characteristics remain poorly known. This study presents the geochemical characteristics of six basalt samples from five seamounts in the Western Pacific and the <sup>40</sup>Ar/<sup>9</sup>Ar ages of three samples are determined. The new analysis yielded <sup>40</sup>Ar/<sup>39</sup>Ar ages for seamounts samples MP3D21, MP5D11, and MP5D15A of 95.43 ± 0.33, 62.4 ± 0.26, and 99.03 ± 0.4 Ma, respectively. The geochemical profiles of seamounts samples MP3D04, MP3D21, MP5D11, MP5D15A, MPID201, and MPID202 are consistent with alkaline basalts, as evidence by alkali-rich, silicon-poor compositions along with high titanium concentrations. The primitive mantle normalized rare-earth elements and trace elements spider pattern are similar to those of ocean island basalts. The Ta/Hf and Nb/Zr ratios and La/Zr-Nb/Zr discriminant diagrams indicate that the six seamounts formed from magma that originated in the deep mantle.https://www.mdpi.com/2077-1312/10/1/54Western Pacific seamountsbasalt<sup>40</sup>Ar-<sup>39</sup>Ar agegeochemistry |
| spellingShingle | Qian Liu Limei Tang Ling Chen Peng Gao <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province Journal of Marine Science and Engineering Western Pacific seamounts basalt <sup>40</sup>Ar-<sup>39</sup>Ar age geochemistry |
| title | <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province |
| title_full | <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province |
| title_fullStr | <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province |
| title_full_unstemmed | <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province |
| title_short | <sup>40</sup>Ar/<sup>39</sup>Ar Ages and Geochemistry of Seamount Basalts from the Western Pacific Province |
| title_sort | sup 40 sup ar sup 39 sup ar ages and geochemistry of seamount basalts from the western pacific province |
| topic | Western Pacific seamounts basalt <sup>40</sup>Ar-<sup>39</sup>Ar age geochemistry |
| url | https://www.mdpi.com/2077-1312/10/1/54 |
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