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Sumisu Island Volcano, Hachijō Subprefecture, Tokyo Metropolis, Japani
| Regional Level Types | |
|---|---|
| Sumisu Island Volcano | Caldera (Active) |
| Hachijō Subprefecture | Subprefecture |
| Tokyo Metropolis | Prefecture |
| Japan | Country |
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Type:
Caldera (Active) - last checked 2024
Other/historical names associated with this locality:
Sumisu Caldera Volcano; Sumisu Volcano; Sumisu-tō
Sumisu Island (Sumisu-tō) is a volcanic, deserted island located in the Philippine Sea approximately 110 kilometres off the coast of Aogashima, near the southern end of the Izu archipelago, Japan.
The island is a basalt and olivine pillar with sheer sides, the only visible portion of an active submarine volcanic caldera extending south of the island with a circumference of approximately 10 kilometres (6.2 mi). The above sea-level portion has a height of 134 metres (440 ft). The island is estimated to have been created by a volcanic eruption around 20,000 years ago.
In 1870, a submarine eruption was recorded NNE of the island, resulting in the formation of a new islet, named Niijima (新島), with a height of 13 metres (43 ft). The islet has subsequently sunk beneath sea level due to erosion.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
1 valid mineral.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Augite Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| ⓘ 'Clinopyroxene Subgroup' |
| ⓘ 'Glass' |
| ⓘ 'Olivine Group' Formula: M2SiO4 |
| ⓘ 'Orthopyroxene Subgroup' |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Unclassified | |||
| ⓘ | 'Clinopyroxene Subgroup' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
| ⓘ | 'Glass' | - | |
| ⓘ | 'Olivine Group' | - | M2SiO4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Olivine Group | M2SiO4 |
| Na | Sodium | |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Mg | Magnesium | |
| Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Al | Aluminium | |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | Silicon | |
| Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Olivine Group | M2SiO4 |
| Ca | Calcium | |
| Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Fe | Iron | |
| Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fossils
This region is too big or complex to display the fossil list, try looking at smaller subregions.This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
Tamura, Y., Tani, Kenichiro, Ishizuka, Osamu, Chang, Q., Shukuno, H., Fiske, R. S. (2005) Are Arc Basalts Dry, Wet, or Both? Evidence from the Sumisu Caldera Volcano, Izu–Bonin Arc, Japan. Journal of Petrology, 46 (9). 1769-1803 doi:10.1093/petrology/egi033
Tani, Kenichiro, Fiske, Richard S., Tamura, Yoshihiko, Kido, Yukari, Naka, Jiro, Shukuno, Hiroshi, Takeuchi, Rika (2008) Sumisu volcano, Izu-Bonin arc, Japan: site of a silicic caldera-forming eruption from a small open-ocean island. Bulletin of Volcanology, 70 (5). 547-562 doi:10.1007/s00445-007-0153-2
