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Orikabe-1a type

Abbr.: OR-1a

• Plutonic rocks
• Marginal facies of the plutonic complex
• Late Cretaceous
• Intruded by: Sasamori type, Orikabe-2 type, Orikabe-3 type
• Intruded in: Tsuwamonozawa type, Tokusenjo type, Senmatsu Formation, Inai Group, Saragai Formation, Niitsuki Formation
• Contemporaneous heterotopic facies: Orikabe-1b type

• Lithofacies: Quartz monzodiorite
• Lithofacies (Minor): Quartz monzonite, Monzodiorite

• Distribution: Marginal parts of Main body
• Distribution: approximatly 37 km²
• Pressure (Consolidation): 0.2 - 0.3 GPa

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

• Distribution: Orikabe - Yagoshi - Mount Ota - Mount Omori - Nakasato - Shimoniju?, Murone town, Ichinoseki city, Iwate pref.; Mount Tokusenjo - Akaiwa - Shimin-no-mori, Kensennuma city, Miyagi pref.

• Takeuchi and Mikoshiba (2002) Geology of the Senmaya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 76p. (in Japanese with English abstract 3p.)