5:15 PM - 6:45 PM
[BCG05-P06] Lithology and radiolarian fossils from Ie Island, Okinawa: Division of the Chichibu Belt around the northwestern Okinawa Island, Japan
Keywords:Radiolaria, Chichibu Belt, Jurassic, accretionary complex, Okinawa
Jurassic accretionary complex of the Chichibu Belt is exposed around the northwestern Okinawa Island, Japan. In previous studies, it was divided into three units: the Iheya, Ie and Motobu units. Based on the division, there is almost no limestone or basalt on Ie Island.
The author conducted a geological survey of Ie Island and attempted to extract radiolarian fossils. As a result, a certain amount of limestone and basalt was discovered. In addition, Permian radiolarians were obtained from chert and earliest Cretaceous ones from siliceous mudstone. Based on the geologic survey and radiolarian age, a new geologic body containing basalt and limestone was recognized.
The author conducted a geological survey of Ie Island and attempted to extract radiolarian fossils. As a result, a certain amount of limestone and basalt was discovered. In addition, Permian radiolarians were obtained from chert and earliest Cretaceous ones from siliceous mudstone. Based on the geologic survey and radiolarian age, a new geologic body containing basalt and limestone was recognized.