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Mount Ryogai

Ashikaga city, Tochigi pref., Japan


Bedded manganese deposit (Diagenesis)

Manganese nodules preserving original chemical composition and sedimentary structures. These manganese nodules are on the surface of Unit 3 of Kuzu Complex, a member of Jurassic accretionary complex Ashio Belt.

Mount Ryogai

Outcrop of manganese nodules associated with bedded chert block in Unit 3 of Kuzu Complex. Black nodules are manganese nodules. The pale brown host is chert. Shape and occurrence are similar to those of manganese nodules on the ocean floor. Chemical composition is same as that of cobalt-rich manganese crust on the present ocean floor.

Reported Minerals

  • Manganese dioxide

Mineral Assemblage

  • Chert(Host) - Manganese dioxide
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