Nakayamagawa Complex

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Nakayamagawa Complex

Plutonic rocks
Late Cretaceous (86 Ma, K-Ar)
Intruded in: Sasugawa Granodiorite, Soo Granodiorite, Gamano Granodiorite, Takatoyama Felsite Dike Swarms, Tajiri Granite, Kuga Group

Lithofacies: Biotite granite
Lithofacies (Minor): Biotite granite porphyry

Distribution (East - West): ca. 11 km
Distribution (South - North): ca. 6 km

Hiroshima Granites (Iwakuni, Hiroshima pref.)
[ Young ]
~~~~~~~~~~~~~~
Nakayamagawa Complex
~~~~~~~~~~~~~~
Shimokuhara Granite
~~~~~~~~~~~~~~
Iwakuni Granite / Yasakakyo Granite
~~~~~~~~~~~~~~
Osogoe Complex
~~~~~~~~~~~~~~
Habu Granodiorite
~~~~~~~~~~~~~~
[ Old ]

Sanyo Belt (Hiroshima)
[ Young ]
~~~~~~~~~~~~~~
Hiroshima Granites
~~~~~~~~~~~~~~
[ Old ]

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

Distribution: Komatsubara - Mount Ryugatake, Shunan city, Yamaguchi pref.; Sasugawa - Mount Himurodake - Mount Niiterayama - Mount Saikojiyama - Yahitsugitoge pass, Iwakuni city, Yamaguchi pref.; Monzen - Mount Tajiriyama, Yanai city, Yamaguchi pref.

Higashimoto et al. (1983) Geology of the Iwakuni District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 6p.)