Abstract
Preliminary U-Pb and Sm-Nd geochronological results from the Sao Jose do Campestre (formerly Caldas Bandao) Massif (SJCM) in the Borborema Province of NE Brazil show evidence for three distinct stages of Archean petrogenesis. The first stage occurred at 3.45 Ga and involved reworking of a slightly older, primitive crust. The second stage took place at 3.2 Ga (Mesoarchean) and is marked by the generation of juvenile crust, with a large production of trondhemitic rocks. The latest magmatic event occurred about 2.7 Ga (Neo-Archean) and produced alkali-rich magmas. Recognition of these different Archean events involving accretion of continental crust into a older cratonic nuclei is an important contribution to the knowledge of the regional tectonic history of the Borborema Province in particular and Gondwana in general.
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