Occurrence of Uranium Ores in the Schist Formation of the Pre-Ordovician Portugal; OCCURENCE DE MINERAIS D'URANIUM DANS LES FORMATIONS DE SCHISTES ANTE-ORDOVICIENS

Technical Report · Sat Oct 31 00:00:00 EST 1959

OSTI ID:4261708

Lobato, C P; Ferrao, C N

The occurrence of uranium ores in concentrations of economical interest in the pre-ordovician schists was noted by the first time, in the region of Pinhel, in November 1958. The occurrence is situated in a zone of graphitic brown-greyish schists which are enclosed in a formation of gneiss with tourmaline near the contact of the latter with the hercinian granite, which constitutes the Beiras' Massif. The uraniferous mineralization is constituted by autunite down to the depth which has been reached by the explorntion work. The radiometric study and the sampling taken nt the depth of about ten meters suggest the continuity of the structure and the persistence of the mineralization associated with it. The structural type and the distribution of the mineralization in the joints and the brecciated zone of the schists suggest that the deposition of uranium ore is not syngenetic, but, rather, that it is attribated to the circulation of mineralized solutions through the breakage produced along the hypothermal veilns, in a posterior reopening connected to the last movements of the alpidic orogenesis. The content obtained in the sampling reveals the existence of an enlarged ore deposit following the directions of the schistosity, wfth an extension of 140 meters and with the medium content of 0.27% U/sub 3/O/ sub 8/. (auth)

• Research Organization: Junta de Energia Nuclear, Lisbon
• NSA Number: NSA-13-006654
• OSTI ID: 4261708
• Report Number(s): A/CONF.15/P/1825
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-59
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

GEOLOGY AND MINERALOGY
AGE
ALUMINUM SILICATES
AUTUNITE
BORON SILICATES
DEPOSITS
ECONOMICS
EUROPE
GEOLOGY
GNEISS
GRANITES
GRAPHITE
HYDROTHERMAL STAGE
LEVELS
MINERALS
MINING
ORES
ORIGIN
OROGENESIS
PORTUGAL
PROSPECTING
QUANTITY RATIO
ROCKS
SCHISTS
SOLUTIONS
TOURMALINE
URANIUM MINERALS
URANIUM ORES
URANIUM PHOSPHATES