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Ojika Mass

Invalid synonym: Okusayama Mass

• Type locality: Mount Okusa, Ishinomaki city, Miyagi prefecture
• Plutonic rocks
• Early Cretaceous (120 Ma)
• Intruded in: Ojika Group

• Lithofacies: Clinopyroxinite, Clinopyroxene gabbro, Olivine orthopyroxene clinopyroxene gabbro, Clinopyroxene hornblende gabbro, Clinopyroxene orthopyroxene gabbro, Quartz diorite, Pyroxene hornblende diorite

• Distribution: 8 x 4 km²
• Intrusion depth: ca. 5 km

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

• Distribution: Mount Okusa, Ishinomaki city, Miyagi 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.)
• Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)
• Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)