RECONNAISSANCE FOR RADIOACTIVE MINERALS IN THE SOUTHERN PART OF BRAZIL

Technical Report · Tue Jan 01 04:00:00 EST 1957

OSTI ID:4828526

Pierson, C T; Haynes, D D; Ribeiro, E; Filho,

During 1954 to l956 a reconnaissance for radioactive minerals was made with carborne, airborne and handborne scintillation equipment in the southern Brazilian states of Rio de Janeiro, Sao Paulo, Parana, Santa Catarina, and Rio Grande do Sul. During the traverse covering more than 5000 kilometers the radioactivity of Precambrian igneous and metamorphic rocks, Paleozoic, Mesozoic, and Cenozoic sedimentary rocks, and Mesozoic alkalic intrusive and basaltic extrusive rocks was checked. The 22 samples collected contained from 0.003 to 0.029% equivalent uranium oxide and from 0.10 to 0.91% equivalent thorium; two samples were taken from radioactive pegmatites for mineralogic studies. None of the localities is at present a commercial source of uranium or thorium; however, additional work should be done near the alkalic stock at Lages in the State of Santa Catarina and at the Passo das tropas fossil plant locality near Santa Maria in the state of Rio Grande do Sul. Near Lages highrly altered alkalic rock from a dike contarned 0.020% uraniunr oxide. At passhr das Trhrpas highly altered, lirnonitc-impregnated sandstone from the Rio do Rasto group of sedimentary rocks contained 0.029% uranium oxide. (auth)

• Research Organization: Brazil. Comissao Nacional de Energia Nuclear; and Geological Survey, Washington, D.C.
• NSA Number: NSA-16-003245
• OSTI ID: 4828526
• Report Number(s): TEM-1098
• Country of Publication: United States
• Language: English

Related Subjects

BRAZIL
DEPOSITS
ECONOMICS
GEOLOGY, MINERALOGY, AND METEOROLOGY
IGNEOUS ROCKS
MINERALS
PROSPECTING
QUANTITY RATIO
RADIOACTIVITY
SCINTILLATION COUNTERS
SOUTH AMERICA
THORIUM
URANIUM OXIDES