Yonaguni Knoll IV
Yonaguni Knoll IV | |
---|---|
Summit depth | 745 metres (2,444 ft) |
Location | |
Location | Okinawa Trough, east of Taiwan |
Coordinates | 24°54′N 122°48′E / 24.900°N 122.800°E[1] |
Yonaguni Knoll IV is a seamount in the Okinawa Trough, east of Taiwan. It lies at about 745 metres (2,444 ft) depth and formed through Quaternary volcanism that yielded dacitic and rhyolitic magmas. The seamount is hydrothermally active, with numerous sites that are colonized by mussels and other marine animals. A submarine underground "lake" of liquid carbon dioxide has been identified at Yonaguni Knoll IV.
Geology and geomorphology
Yonaguni Knoll IV (also known as Daiyon-Yonaguni
The seamount reaches a minimum depth of about 745 metres (2,444 ft).
Yonaguni Knoll IV lies at the southwestern end[12] of a northeast–southwest trending chain of volcanic seamounts in the southern Okinawa Trough,[13] and may be a product of the subduction of the Gagua submarine ridge, which commenced in the early Pleistocene[16] and generated a slab window under the Okinawa Trough. There are more than 70 volcanoes in this chain.[10] These volcanoes were active during the Quaternary and erupted dacites and rhyolites. The magma formed through the fractional crystallization mixing of basalt from the mantle and felsic magmas from the crust.[6]
Hydrothermal venting
The area of Yonaguni Knoll IV first drew attention in 1996 during a joint French-Taiwanese expedition on the R/V L'Atalante.[17] Hydrothermal venting at the knoll was discovered in 2000 by the DSV Shinkai 6500 submersible, and the venting of liquid CO
2 by the same submersible three years later. Liquid CO
2 was observed venting from the JADE hydrothermal site also in the Okinawa Trough in 1989.[18]
Multiple separate hydrothermal vent sites occur in the valley southwest of Yonaguni Knoll IV;
Liquid carbon dioxide
The liquid CO
2 is vented from areas between the Tiger and Swallow vents and at the Crystal site.[23] Liquid CO
2 appears to pool beneath the seafloor[21] and a "lake" of liquid CO
2 has been found, buried beneath 20–40 centimetres (8–16 in) thick sediment, 50 metres (160 ft) south of the hydrothermal vents. Given that at such depths CO
2 is less dense than water, it may be trapped under a layer of CO
2 hydrate beneath the sediment layers.[24]
Origin of the hydrothermal fluids
An intense hydrothermal system must exist there to power the various seafloor surface manifestations.
The liquid CO
2 ultimately derives from the hydrothermal fluids but accumulates there before giving rise to the CO
2 hydrate that eventually produces the liquid droplets, and the hydrothermal fluids vented are not the same as these that give rise to the CO
2. The hydrothermal fluids are partitioned underground into separate brine-rich, vapour-rich and residual fluids[27] which rise to the surface and give rise to numerous separate vents.[11] Hydrothermal plumes rise from above the vent sites[26] and the seawater above Yonaguni has unusually high methane concentrations.[28]
Hydrothermal deposits
Red and yellow
Life
Hydrothermal communities occur at Yonaguni Knoll IV, with dense assemblages of vent animals at the "Crystal" site
Hydrothermal sediments at Yonaguni Knoll IV have diverse microbial communities, with over one billion cells per 1 cm3 (0.061 cu in).
2, as the exhalations there are the most H
2 rich in the Okinawa Trough. Heterotrophic lineages have also been found.[52] Microbial communities have also been sampled from hydrothermal plumes.[53]
The emission of CO
2 is detrimental to ecosystems on Yonaguni Knoll IV, as there are fewer animals where the emissions take place and hydrates form.[54] On the other hand, a diverse microbial ecosystem has been identified from the margins of the liquid CO
2 "lake".[55]
Notes
- barite, bornite, calcite, chalcopyrite, covellite, galena, nukudamite, pyrite, rhodochrosite, sphalerite, stibnite, tennanite-tetrahedrite series and wurtzite.[8]
- ^ The shrimp Lebbeus shinkaiae was discovered at Yonaguni Knoll IV and on Hatoma Knoll, also in the Okinawa Trough.[39]
- Bathyacmaea secunda, Lepetodrilus nux, Margarites ryukyuensis, Peltospiridae sp., Provanna sp., Puncturella parvinobilis and Pyropelta ryukyuensis.[46][50]
References
- ^ a b Wu et al. 2019, p. 2.
- ^ Ishibashi, Okino & Sunamura 2015, p. 388.
- ^ a b Suzuki et al. 2008, p. 268.
- ^ a b Konno et al. 2006, p. 2.
- S2CID 208083816.
- ^ a b Chen et al. 2020, p. 4280.
- ^ ISSN 0169-1368.
- ^ a b c d Gena et al. 2013, p. 361.
- ^ a b c d Kedzior et al. 2016, p. 6621.
- ^ a b c d Chen et al. 2020, p. 4281.
- ^ a b Nunoura et al. 2010, p. 1199.
- ^ a b c Wu et al. 2019, p. 8.
- ^ a b c d e Suzuki et al. 2008, p. 269.
- ^ Ishibashi, Okino & Sunamura 2015, p. 341.
- ^ Rehder & von Deimling 2008, p. 31.
- ^ Wu et al. 2019, p. 1.
- ^ Rehder & von Deimling 2008, p. 6.
- ^ Konno et al. 2006, p. 1.
- ^ Gena et al. 2013, p. 362.
- ^ Nunoura & Takai 2009, p. 355.
- ^ a b Nunoura & Takai 2009, p. 352.
- ^ Ishibashi, Okino & Sunamura 2015, p. 380.
- ^ Suzuki et al. 2008, p. 270.
- ^ Inagaki et al. 2006, p. 14165.
- ^ Chen et al. 2020, p. 4296.
- ^ Bibcode:2011AGUFMOS21B..07B.
- ^ Konno et al. 2006, pp. 4–5.
- S2CID 202641187.
- ^ Suzuki et al. 2008, p. 271.
- ^ Suzuki et al. 2008, p. 273.
- ^ Suzuki et al. 2008, p. 278.
- ^ Suzuki et al. 2008, pp. 276–277.
- ^ a b Ishibashi, Okino & Sunamura 2015, p. 342.
- ^ Ishibashi, Okino & Sunamura 2015, p. 53.
- ^ Ishibashi, Okino & Sunamura 2015, p. 430.
- ^ Rehder & von Deimling 2008, p. 60.
- PMID 27470798.
- ^ Ishibashi, Okino & Sunamura 2015, p. 452.
- .
- ^ Ishibashi, Okino & Sunamura 2015, pp. 452–453.
- S2CID 84024667.
- PMID 18319477.
- PMID 31060509.
- PMID 17329770.
- PMID 23847597.
- ^ a b Ishibashi, Okino & Sunamura 2015, p. 451.
- .
- ^ Ishibashi, Okino & Sunamura 2015, p. 453.
- .
- ISSN 0171-8630.
- .
- ^ Nunoura et al. 2010, p. 1208.
- ^ Ishibashi, Okino & Sunamura 2015, p. 33.
- ISSN 1750-5836.
- ^ Inagaki et al. 2006, p. 14168.
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