Tsukubasan Gabbroic Body

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Tsukubasan Gabbroic Body

Invalid synonym: Tsukubasan Gabbroic Complex

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

Lithofacies: Olivine gabbro, Hornblende gabbro, Anorthosite, Cortlndite
Lithofacies (Minor): Spessartite

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

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

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

Distribution: Mount Tsukuba, Tsukuba city, Ibaraki pref.; Dorokujin pass, Kasama city - Ishioka city, Ibaraki pref.; Omasu, Ishioka 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.)