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Uranium enrichment in archaean basement : lagoa real, brazil

Year: 1982

Type: article

Abstract: ln the Lagoa Real region of the Sao Francisco craton altered basement, amphibolite-granulite facies felsic gneisses host significam uranium deposits. Retrograde alteration under epidote-amphibolite facies conditions as revealed by mass balance calculations is dominated by sodium addition, oxidation, silica leaching and uranium enrichment. Oxygen isotope data indicate that uranium was precipitated from isotopically light fluids at temperatures near 500°C. Fluid inclusion data indicate similar temperatures at variable salinities. It is proposed that the geochemical observations are in accord with a model where the basement has been thrust over Proterozoic sediments and processes are controlled by an inverted thermal gradient.

Source: Brazilian Journal of Geology

DOI: 10.5327/rbg.v12i1-2-3.293

Authors: Lydia Maria Lobato, J. M. A. Forman, Kazuo Fuzikawa, W. S. Fyfe, R. Kerrich

Institution: Western University

Language: English

Topic: Geological and Geochemical Analysis

Subfield: Geochemistry and Petrology

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W1591348890

FWCI: 0.845

Cites:

Cited by: 4

Related to: 10