Abstract
The Niquelândia Complex comprises two main superposed sequences dipping westward: the lower (LS), at the eastern, and the upper (US), at the western part of the body. The Complex is either interpreted as a single body, or as two distinct unrelated layered massifs. New SHRIMP U-Pb determinations on igneous zircon grains of anorthosites from Niquelândia US and from the upper portion of the Barro Alto Complex indicate crystallization ages of 833 ± 21 Ma and 733 ± 25 Ma, respectively, thus supporting Cryogenian Neoproteroic ages for the igneous crystallization of the US unit of Niquelândia and for the Barro Alto anorthosites.
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