Submarine volcanoes East and South of Izu Peninsula, Central Japan

Aramaki, Shigeo

http://hdl.handle.net/10400.3/4892

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Authors

Aramaki, Shigeo

Abstract(s)

More than 50 volcanic centers are recognized as positive topography on the sea floor east and south of Izu Peninsula. Most of them are probably late Quaternary basaltic cones resting on the basement of Miocene submarine volcanic rocks. Recent dredge hauls have revealed that those submarine volcanoes located close to Izu Peninsula belong to the high-Al and/or high alkali basalts while those further south are either low alkali tholeiites or calk-alaki rhyolites associated with high-Al basalts. Submarine volcanoes dose to Izu Peninsula are contemporaneous with a group of basaltic (and minor rhyolitic) monogenetic volcanic centers clustered in the central Izu Peninsula, which were active during the last 100,000 years. […].