EVOLUÇÃO SEDIMENTAR DO SUPERGRUPO MINAS: 500 MA. DE REGISTRO GEOLÓGICO NO QUADRILÁTERO FERRÍFERO, MINAS GERAIS, BRASIL

It is now possible to bracket the age of the Minas Supergroup with reasonable precision between about2580 Ma. (base of the Moeda Formation) and 2050 Ma. (top of the Sabará Formation) on the basis of precisezircon U-Pb age determinations from both granitic rocks of the basement and detrital zircons from quartzitesand graywackes of the Proterozoic metasedimentary sequences of the Quadrilátero Ferrífero.Three major unconformities subdivide the stratigraphic column into three sequences. The first sequencecomprises the Moeda, Batatal, Cauê and Gandarela Formations from 2580 to 2400 Ma. The second s... Mehr ...