| Autor: |
Akira Ijiri, Ryoma Setoguchi, Yuki Mitsutome, Tomohiro Toki, Masafumi Murayama, Kyoko Hagino, Yohei Hamada, Takeyasu Yamagata, Hiroyuki Matsuzaki, Wataru Tanikawa, Osamu Tadai, Kazuya Kitada, Tatsuhiko Hoshino, Takuro Noguchi, Juichiro Ashi, Fumio Inagaki |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Frontiers in Earth Science, Vol 11 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2296-6463 |
| DOI: |
10.3389/feart.2023.1206810 |
| Popis: |
Mud volcanoes are topographic features through which over-pressurized sediments are intruded upward and erupted, transporting fluids and sediments from the deep subsurface to the surface/seafloor. To understand material and biogeochemical cycling through mud volcanoes, we investigated the origins of sediments and fluids erupted by four submarine mud volcanoes off Tanegashima Island, along the northern Ryukyu Trench: MV#1–3 and MV#14. We estimated the ages of the source sequences of the mud volcano sediments to be middle to late Miocene based on nannofossils and 10Be ages. The sediments were characteristically enriched in illite. The similar mineral compositions and vitrinite reflectance values (0.42%–0.45%) of sediments erupted by the mud volcanoes strongly suggest that each is rooted in the same source sequence. Pore waters had Cl− concentrations ∼40% that of seawater and were proportionally enriched in 18O and depleted in D, indicating the addition of freshwater from the dehydration of clay minerals. However, the smectite and illite contents ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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