Uruguayan dyke swarms

The Uruguayan dyke swarms consist of three dyke swarms of Precambrian age that intrude Río de la Plata Craton and Brasiliano Cycle continental crust in Uruguay. The dykes – including the Florida dyke swarm, the Nico Perez dyke swarm, and the Treinta y Tres dyke swarm – are of mafic to intermediate composition and each group lies in a separate tectono-stratigraphic terrane. The rocks of the Florida dyke swarm have been quarried since the 1960s and are used in the construction industry as black dimension stone of very high quality, being marketed as "black granite".

Uruguayan dyke swarms
Name Intruded terrane Age Lithology Strike
Florida dyke swarm Piedra Alta Terrane 1.790 ± 5 Ga Basaltic andesite, andesite NE-SW, E-W and NW-SE
Nico Perez dyke swarm Nico Perez Terrane ca. 0.750 Ga Basalt, basaltic andesite NNE-SSW
Treinta y Tres dyke swarm Cuchilla-Dionisio terrane ca. 0.750 Ga Basalt NNE-SSW
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