Chemical compositions of rocks erupted from submarine volcanoes and of volcanic rocks occurring in adjacent areas in the Izu-Ogasawara arc.
This paper reports chemical compositions and chemical characteristics of volcanic rocks erupted from submarine volcanoes in the Izu・Ogasawara arc (from Myozin Reef(Myojin Reef) to Hukuzin Seamount (Fukujin Seamount)) . SiO2 content of the volcanic rocks ranges from 45 to 70 weight percent. The rocks from the north of Sohu Rock (Sofu Rock) are relatively poor in Na2O, K2O and P2O5, whereas most of the rocks from the south of Nisi-no-Sima (Nishinoshima) are enriched in these oxides. The alkaline rocks from lo- Sima Iwojima), Hukutoku-Oka-no-Ba(Fukutokuoka-no-ba)and Minami-Hiyosi Seamount (MinamiHiyoshi Seamount), which erupted recently, show the further enrichment in Na2O and K2O.
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| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1990
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| Online Access: | http://hdl.handle.net/1834/16069 |
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