Yamada type

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Yamada type

Invalid synonym: Yamada Granodiorite

Plutonic rocks
Zoned pluton
Early Cretaceous

Lithofacies: I-type (Ilmenite series)
Lithofacies: Adakitic, Felsic
Lithofacies: Tonalite, Granodiorite

Distribution (East-West): ca. 20 km
Distribution (South-North): ca. 50 km
Upper limit: Unconformity (Raga Formation)

Miyako Granite (Central facies)
[ Margin ]
~~~~~~~~~~~~~~
Shimotanabe type
~~~~~~~~~~~~~~
Yamada type
~~~~~~~~~~~~~~
[ Center ]

Miyako Granite (Marginal facies)
[ Margin ]
~~~~~~~~~~~~~~
Miyako type
~~~~~~~~~~~~~~
Osawa type
~~~~~~~~~~~~~~
Ashiharahira type
~~~~~~~~~~~~~~
[ Center ]

II Zone
[ North ]
~~~~~~~~~~~~~~
Hashikami Granite
~~~~~~~~~~~~~~
Tanohata Granite
~~~~~~~~~~~~~~
Miyako Granite
~~~~~~~~~~~~~~
[ 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: Chikanai river, Iwafune, Miyako city, Iwate pref.

Tsuchiya et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.159-179 DOI
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.)