Abstract
Neogene volcanic rocks in the Sado Island, central Japan, were dated by the K-Ar method. Newly obtained ages are 22.82±0.57 Ma for welded tuff of the Masaragawa Formation, 17.81±0.47∼21.33±0.58 Ma for dacite lavas of the Aikawa Formation, 14.5±1.4 Ma for glassy andesite of the Sanze Formation, 10.70±0.43∼14.0±1.5 Ma for the Ogi Basalt Formation (from the lowest to the uppermost) and 15.5±2.2 Ma for picrite intrusive rock in the Ogi Basalt Formation. The volcanic activity of the Ogi Basalt Formation ranges about 11∼13 Ma. This shows Ogi Basalt Formation distributed in the Ogi Peninsula, was the final volcanic activity in the Sado Island.
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