Friday, August 26, 2011

Sandstone-Hosted U-V and Base Metal Deposits


Sandstone-Hosted U-V and Base Metal Deposits


 Both classes are hosted by continental to very shallow marine sediments
 The deposits are conformable, often associated with primary sedimentary features and is concentrated in bleached or grey-green organic and pyrite –rich beds
 The ores are diagenetic to epigenetic and, because of the prosity of the host sediments, are often characterized by a large number of brightly coloured secondary oxidation zone minerals
 Geographic Distribution: Western States, USA, Mesozoic fluviatile Sandstones and Siltstones
 Cu, Pb, Zn sulphide Deposits are concentrated into bleached horizons within reddened sequences, where they form syndiagenetic cements around elastic grains,
The primary and secoundary mineralization is controlled by the local prosity and permeability of the host rocks

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