Ryukyu Arc: Difference between revisions

Revision as of 08:32, 2 December 2022

Revision as of 08:33, 2 December 2022

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===Motobu and Yonamine Formations===

The Motobu and Yonamine Formations are [[Permian]] rocks that constitute the basement of the Motobu peninsula of [[Okinawa Island]], Central Ryukyu.<ref name=":10">Ishibashi, T. (1969). Stratigraphy of the Triassic formation in Okinawa-jima, Ryukyus. ''Mem. Fac. Sci. Kyushu Univ., ser.D, Geology, 19''(3),373–385</ref>

The Motobu Formation consists mainly of [[limestone]] interbedded with [[chert]] and [[phyllite]].<ref name=":11">Flint, D. E., Saplis, R. A., & Corwin, G. (1959). Military geology of Okinawa-jima, Ryukyu-retto. US Army Pacific Office Eng., 5, 88.</ref> The limestone contains [[foraminifera]] fossils of Permian age.<ref name=":9" /><ref name=":12">Konishi, K. (1963). Pre-Miocene basement complex of Okinawa, and the tectonic belts of the Ryukyu Islands. ''Sci. Rep. Kanazawa Univ., 8'', 569–602.</ref>

The Yonamine Formation, with strata of interbedded phyllite, [[slate]], [[sandstone]], limestone, greenstone, and chert,<ref name=":11" /> underlies the Motobu Formation<ref name=":12">Konishi, K. (1963). Pre-Miocene basement complex of Okinawa, and the tectonic belts of the Ryukyu Islands. ''Sci. Rep. Kanazawa Univ., 8'', 569–602.</ref> and contains Permian coralcorals.<ref name=":13">Haikawa, T., & Ishibashi, T. (1981). Waagenophyllum (Waagenophyllum) okinawense, a new Permian coral from Okinawa-jima, Ryukyu Islands: Paleontological Study of the Ryukyu Islands-VII. ''Mem. Fac. Sci. Kyushu Univ., ser.D, Geology, 24''(3), 179–188</ref>

===Tomuru Formation===