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Uruguayan dyke swarms

Shear zones and terranes in Uruguay after Gaucher et al. (2008).[1]

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.[2] 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".[3]

Uruguayan dyke swarms
Name Intruded terrane Age[2][4] 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
  1. ^ Gaucher, C.; Finney, S. C.; Poiré, D. G.; Valencia, V. A.; Grove, M.; Blanco, G.; Pamoukaghlián, K.; Peral, L. G. (2008). "Detrital zircon ages of Neoproterozoic sedimentary successions in Uruguay and Argentina: insights into the geological evolution of the Río de la Plata Craton". Precambrian Research. 167 (1): 150–170. doi:10.1016/j.precamres.2008.07.006. hdl:11336/74329. Retrieved January 24, 2016.
  2. ^ a b Mazzucchelli, Maurizio; Rivalenti, Giorgio; Piccirillo, Enzo Michele; Vitorio Girardi, Vicente Antonio; Civetta, Lucia; Petrini, Riccardo (1995). "Petrology of the Proterozoic mafic dyke swarms of Uruguay and constraints on their mantle source composition". Precambrian Research. 74 (3): 177–194. doi:10.1016/0301-9268(95)00014-v.
  3. ^ Morales Demarco, Manuela; Oyhantçabal, Pedro; Stein, Karl-Jochen; Siegesmund, Siegfried (2011). "Black dimensional stones: geology, technical properties and deposit characterization of the dolerites from Uruguay" (PDF). Environmental Earth Sciences. 63 (7): 1879–1909. doi:10.1007/s12665-010-0827-5.
  4. ^ Cite error: The named reference Teixetal2013 was invoked but never defined (see the help page).

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