NINGYOITE, A NEW URANOUS PHOSPHATE MINERAL FROM JAPAN
Journal Article
·
· Am. Mineralogist
OSTI ID:4225128
Carbonate content was determined for 888 samples from the Salt Wash member of the Morrison formation in the Slick Rock and Uravan mining districts in southwestern Colorado. The carbonate content of most samples was determined semiquantitatively by calculating the amount of calcite equivalent to the mass of carbon dioxide evolved when the samples were treated with 3 normal hydrochloric acid. The content of some samples was determined in the course of standard chemical assays and the content of others was visually estimated. Samples were assigned to categories or rock types'' on the basis of gross lithology, vanadium - uranium content, degree of epigenetic alteration, and degree of oxidation through weathering. The average carbonate content was determined for each rock type, and the distribution of carbonate around oxidized and unoxidized ore was investigated. Results indicate that sandstone in the uppermost (ore- bearing) part of the Salt Wash member contains 2.5 to 3.0% carbonate, whereas sandstone in the lower (generally barren) part of the Salt Wash member contains about 13% carbonate. Altered mudstone in the Salt Wash member contains about 4% carbonate, and unaltered mudstone about 7%. Carbonaterich zones in sandstone adjacent to contacts with mudstone may be of syngenetic or early diagenetic origin, whereas carbonate-rich zones associated with ore bodies may be genetically related to the ore deposits. Where the sandstone has been subjected to weathering, the over-all distribution of carbonate does not seem to have been greatly affected. (auth)
- Research Organization:
- Atomic Fuel Corp., Tokyo
- NSA Number:
- NSA-13-019056
- OSTI ID:
- 4225128
- Journal Information:
- Am. Mineralogist, Journal Name: Am. Mineralogist Vol. Vol: 44
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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