Physics
Scientific paper
Dec 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15..229k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 3, pp.229-232
Physics
1
Scientific paper
A study has been made of uranium bearing iron oxides from the shear-zone of Bihar, with particular reference to the nature of the association of uranium with magnetite and hematite. In veins where none or very little hematitization has taken place, the primary magnetite and uraninite coexist. Where hematitization has taken place the uranium is very intimately associated with the hematite, probably as a very limited solid solution. A sample of hematite containing uranium equivalent of 0.15 per cent U 3 O 8 was found to be metamict, the reconstitution of which was established by X-ray and differential thermal analysis methods. It is believed that a primary oxidizing solution containing uranyl ions caused the oxidation of the ferrous hydrosol to magnetite and the simultaneous precipitation of uraninite. A later stage oxidizing solution or normal agents of weathering converted the magnetite to hematite and the uraninite to probably U 3 O 8 or UO 3 , a small amount of which was then somehow taken up in the hematite lattice, and the rest being converted to secondary uranium minerals, the presence of which is known.
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