Goyosan Pluton

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Goyosan Pluton

Invalid synonym: Goyosan Granodiorite, Okirai Granodiorite

Plutonic rocks
Early Cretaceous (128 - 108 Ma, K-Ar)
Intruded in: Kogawa Formation, Kamaishi Formation, Ofunato Group

Lithofacies: Adakite
Lithofacies: Hornblende biotite granodiorite, Tonalite
Lithofacies (Minor): Monzogranite, Quartz diorite, Gabbro

Distribution (East-West): ca. 20 km
Distribution (South-North): ca. 24 km

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: Mount Goyozan, Kamaishi city, Kunohe county, Iwate pref.; Cape Ryori, Sanriku town, Ofunato city, Iwate pref.

Tsuchiya et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.159-179 DOI
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.)
Yoshida (1961) Kamaishi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 26p. (in Japanese with English abstract 5p.)