Tsukubasan mass

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Tsukubasan mass

Type locality: Mount Tsukuba, Tsukuba city, Ibaraki prefecture
Plutonic rocks
Late Cretaceous (75 Ma, K-Ar)

Lithofacies: Anorthosite, Hornblende gabbro, Olivine gabbro, Cortlandite

Distribution (East-West): 5 km
Distribution (South-North): 2 km

Tsukubasan Gabbroic Body
[ North ]
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Tsukubasan mass
~~~~~~~~~~~~~~
Dorokujin mass
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[ South ]

Tsukuba, Ibaraki pref.
[ Young ]
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Kabasan Granite
~~~~~~~~~~~~~~
Tsukuba Granite / Inada Granite
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Tsukubasan Gabbroic Body
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[ Old ]

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Mount Tsukuba, Tsukuba city, Ibaraki pref.

Takahashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.21-31 DOI
Miyazaki et al. (1996) Geology of the Makabe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 4p.)