Okuboyama type

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Okuboyama type

Plutonic rocks
Origin of partial melting of subducted oceanic crusts (Adakite)
Early Cretaceous
Intruded in: Yoshihama rocks

Lithofacies: Adakite
Lithofacies: Hornblende biotite granodiorite, Tonalite

Goyosan Pluton
[ Young ]
~~~~~~~~~~~~~~
Okuboyama type / Kuroiwa type
~~~~~~~~~~~~~~
Yoshihama type
~~~~~~~~~~~~~~
Gabbroic rocks
~~~~~~~~~~~~~~
[ Old ]

V Zone
[ North ]
~~~~~~~~~~~~~~
Kurihashi quartz diorite
~~~~~~~~~~~~~~
Tono Granodiorite
~~~~~~~~~~~~~~
Hitokabe Granite
~~~~~~~~~~~~~~
Goyosan Pluton
~~~~~~~~~~~~~~
Senmaya Tonalitic Pluton
~~~~~~~~~~~~~~
[ South ]

Kitakami mountains plutonic rocks
[ East ]
~~~~~~~~~~~~~~
I Zone
~~~~~~~~~~~~~~
II Zone
~~~~~~~~~~~~~~
III Zone
~~~~~~~~~~~~~~
IV Zone
~~~~~~~~~~~~~~
V Zone
~~~~~~~~~~~~~~
VIa Zone
~~~~~~~~~~~~~~
VIb Zone
~~~~~~~~~~~~~~
[ West ]

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

Distribution: Kawauchi - Mount Okubo, Ushiroyama, Senzai - Konpaku - Yoshihama - Ryori, Sanriku town, Ofunato city, Iwate pref.

Nishioka and Yoshikawa (2004) Geology of the Ryori District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 49p. (in Japanese with English abstract 3p.)