TrekGEO > Mineral Trail > Occurrence > Sandstone-type Uranium Deposit

Japanese page

Sandstone-type Uranium Deposit

Chemical Process (Solution-Rock interaction) - Ground Surface (Meteoric)

Required Geological Setting

Neogene and Quaternary sediments


Uranium deposits in fluvial sedimentary rocks such as sandstones and conglomerates, especially arkose sandstones. Formation of this type deposits is recognized from Devonian period (400 Ma) in Paleozoic Era to the present time. Most of deposits exhibit bedded form, and associated with organic matters and pyrite. The formation process is considered as follows: Dissolved uranium in the groundwater is reduced to be deposited at the reductive condition supplied by organic matters originated from plant fossils in the host rocks. Japanese uranium deposits are observed in high permeable sediments at the channel basements of old rivers, and associated with plant fossils such as lignites.

Mineral Assemblages

Ningyoite, Uraninite (Pitchbelnde), Coffinite, Pyrite

Copyright (c) 2016 NariNari, All Rights Reserved.