K-Ar dating of mugearites from Dogo, Oki island, Shimane prefecture, southwestern Japan.

概要

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Two mugearites from Dogo, Oki islands, southwestern Japan were dated by the K-Ar method with a basalt from Omine basalt group to provide stratigraphic anchors of the geological succession of the volcanic rocks in the island. The obtained K-Ar ages of the mugearites are 5.4 Ma, and identical within analytical error. The K-Ar age of the Omine basalt from Daimanji-yama in the eastern area of the island is 4.6 Ma. The mugearite group seems to be not accompanied by a contemporary basalt suit. The Omine basalt group can be divided into 4 groups or more by means of ages, petrochemistry, and distribution area.
日本鉱物科学会の論文