How old is the Pao de Acucar?

Answer 1

About 555-563 million years old:

zircon U-Pb SHRIMP(sensitive high resolution ion microprobe) geochronological data : Pão de Açúcar gneissic granite-- ages of 559 ±4 Ma (million of years ago)

http://sbgeo.org.br/rgb/vol33_down/3302/1381.pdf.

ZIRCON U-Pb SHRIMP DATING OF THE SERRA DOS ÓRGÃOS AND RIO DE JANEIRO GNEISSIC GRANITIC SUITES: IMPLICATIONS FOR THE (560 Ma) BRASILIANO/PAN-AFRICAN COLLAGE*
Revista Brasileira de Geociências, Luiz Carlos da Silva et al,
33(2):p237-244, junho de 2003