Geochemical transferences between environments of intemperic alteration and sedimentation: study of the Catalão I carbonatite-alkaline complex

• Grant number: 91/03518-0
• Support Opportunities: Research Projects - Thematic Grants
• Start date: June 01, 1992
• End date: May 31, 1995
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Adolpho José Melfi
• Grantee: Adolpho José Melfi
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The Catalão I carbonatite-alkaline complex is covered by a thick layer of lateritic alteration, in the heart of which there are significant mineral accumulations (P, Ti, Nb, TR). The existence of a carstic lake system, of extreme simplicity, with associated sedimentary deposits of up to 120m make of this area an excellent natural laboratory, which studied by geochemical, isotopic, mineralogical, polynological and paleomagnetic methods will enable the establishment of models for the system of alteration-sedimentation and the quantification of geochemical transfers and their relationship with climatic variations occurred in the Ceozoic. (AU)