Abstract
This paper presents Rb-Sr isotopic data concerning the understanding of the origin, age and emplacement of the Pariqüela Açu massif, a small ocurrence (3,5 x 2,5 km) of mafic-ultramafic alkaline rocks discovered by aeromagnetic interpretation in 1979. The massif is situated in São Paulo - southeastem Brazil - near the Jacupiranga and Juquiá alkaline complexes in the low Ribeira de Iguape river valley. Rb-Sr data and the K/Ar available ages in the literature of nearby complexes are discusssed. It has also shown and discussed the characteristic aeromagnetic pattern of Pariqüera Açu body and related intrusives, as well as its geology, rock types, distribution and age and its relationships to the nearby complexes.
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