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
^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.
^ abMazzucchelli, 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.
^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.
^Cite error: The named reference Teixetal2013 was invoked but never defined (see the help page).
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Permo-Triassic Karoo Sequence is intruded by mostly Mesozoic dolerite sills and dykeswarms, which, together with extensive basaltic volcanism and alkaline sub-volcanic...
Water pits were disappointingly inadequate for drinking, but attracted swarms of small birds, and Darwin made his only note of the finches he was not...
November 25 – Henry Mildmay, English politician (d. 1692) December 10 – Thomas Dyke, English politician (d. 1669) December 13 – Andrij Savka, Lemko bandit (d...
Matthew Stewart, Scottish mathematician (b. 1717) February 24 – Sir Thomas Dyke Acland, 7th Baronet (b. 1722) February 26 – Barbara Erni, Liechtenstein confidence...
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