Radiolarian Age of Manganese Ore and Red Chert from the Ananai Stratiform Manganese Deposit in the Northern Chichibu Belt, Central Shikoku, Japan |
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| Authors: | Kiyoko Kuwahara Koichiro Fujinaga Yasuhiro Kato |
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| Institution: | Department of Geosciences, Osaka City University, 3–3–138 Sugimoto, Sumiyoshi-ku, Osaka 558–8585, Japan [];Department of Resources and Environmental Engineering, Waseda University, 3–4-1 Okubo, Shinjuku-ku, Tokyo 169–8555, Japan;Department of Geosystem Engineering, University of Tokyo, 7–3-1 Hongo, Bunkyo-ku, Tokyo 113–8656, Japan |
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| Abstract: | Abstract. We obtain radiolarian fossils such as Follicucullus monacanthus, Pseudoalbaillella aff. globosa, Pseudoalbaillella cf fusiformis , and Pseudoalbaillella spp. belonging to the Pseudoalbaillella globosa and Follicucullus monacanthus Zones from manganese ore and associated red chert of the Ananai stratiform manganese deposit in the Northern Chichibu Belt, central Shikoku. The depositional age of the Ananai ore deposit is constrained as Guadalupian (Middle Permian) that is between 270.6 and 260.4 Ma in the updated geologic time scale. |
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| Keywords: | radiolarian age stratiform manganese deposit red chert Chichibu Belt Middle Permian |
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