Iwatate Basalt

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Iwatate Basalt Kano et al., 2025

Volcanic rocks
Pleistocene (1.16 Ma, K-Ar)

Sedimentary facies: Island arc alkarine basalt
Sedimentary facies: Pyroclastic cone
Lithofacies: Alkaline basalt
Lithofacies: Clinopyroxene-bearing olivine basalt scoriaceous lapilli, Lava, Dikes
Sedimentary structures (Minor): Platy joints

Thickness (Lava): ca. 10 m
Distribution (Pyroclastic cone, Major axis): 1 km
Distribution (Pyroclastic cone, Minor axis): 0.6 - 0.7 km
Upper limit: Unconformity (Older Volcanic Fan deposit, Volcanic Fan I Deposit)
Lower limit: Unconformity (Ebi Granite)

Yokota Volcano Group
[ Upper ]
~~~~~~~~~~~~~~
Iwatate Basalt
~~~~~~~~~~~~~~
Hoden Basalt
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Tsuruta Basalt
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Oegawa river, Iwatate, Hoki city, Saihaku county, Tottori pref.

Kano et al. (2025) Geology of the Yonago District (2nd Ed.), Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 84p. (in Japanese with English abstract 4p.)