Abstract
Major and trace element along with representative Sr, Nd and Pb isotope data are presented for drill core samples which intersect an 800 m lava pile in eastern Uruguay. The lavas form part of the Parana flood basalt province, are low-Ti in composition but distinct from the low-Ti Gramado magma type, and have been termed the Treinte Y Tres magma type. The lava pile overlies a large positive gravity anomaly inferred to reflect an east-west trending, mid-crustal mafic intrusive body with a calculated volume of 35,000 km