| 日本西南部四国增生复合体中的锰矿分布 |
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| 引用本文：Masaharu NAKAGAWA.2012.日本西南部四国增生复合体中的锰矿分布[J].地球学报,33(s1):50-54. |
| DOI：10.3975/cagsb.2012.s1.25 |
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| 中文摘要:Bedded manganese ore deposits occur in many localities within the accretionary belts of the Shikoku region, SW Japan. The deposits occur mostly in bedded chert or its metamorphosed equivalent. These chert-hosted manganese deposits are considered to have been manganese nodule/crust-bearing siliceous sediments on deep-sea floor and have been converted to manganese ores by low-grade metamorphism through subduction-accretion process. The mineral assemblages of the ores reflect the metamorphic grade of the accretionary complexes. On the other hand, iron-manganese deposits and some manganese deposits occurring directly over basalt are considered to have been the hydrothermal precipitates associated with submarine volcanism. |
| 中文关键词:Manganese deposit Accretionary complex Shikoku Metamorphism Deep-sea manganese nodule/crust |
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| Manganese Deposits Distributed in the Accretionary Complexes of Shikoku, Southwest Japan |
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| Abstract:Bedded manganese ore deposits occur in many localities within the accretionary belts of the Shikoku region, SW Japan. The deposits occur mostly in bedded chert or its metamorphosed equivalent. These chert-hosted manganese deposits are considered to have been manganese nodule/crust-bearing siliceous sediments on deep-sea floor and have been converted to manganese ores by low-grade metamorphism through subduction-accretion process. The mineral assemblages of the ores reflect the metamorphic grade of the accretionary complexes. On the other hand, iron-manganese deposits and some manganese deposits occurring directly over basalt are considered to have been the hydrothermal precipitates associated with submarine volcanism. |
| keywords:Manganese deposit Accretionary complex Shikoku Metamorphism Deep-sea manganese nodule/crust |
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