Journal
INTERNATIONAL JOURNAL OF EARTH SCIENCES
Volume 101, Issue 7, Pages 1745-1762Publisher
SPRINGER
DOI: 10.1007/s00531-012-0757-4
Keywords
Paleoproterozoic; Neoproterozoic; Granulites; Shear zones; Granites; Geochronology; U-Pb SHRIMP; K-Ar; Zircon; Monazite; Th-U-Pb monazite EMP method
Categories
Funding
- German Science Foundation (DFG) [GZ: SI 438/40-1]
- Programa 720-Contrapartida de Convenios of the Universidad de la Republica [240011-000274-11]
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The Isla Cristalina de Rivera crystalline complex in northeastern Uruguay underwent a multistage magmatic and metamorphic evolution. Based on SHRIMP U-Pb zircon, Th-U-Pb monazite (CHIME-EPMA method) and K-Ar age data from key units several events can be recognized: (1) multistage magmatism at 2,171-2,114 Ma, recorded on zircon of the granulitic orthogneisses and their 2,093-2,077 Ma overgrowths; (2) a distinct amphibolite facies metamorphism at 1,980 Ma, recorded by monazite; (3) greenschist facies reworking and shearing at ca. 606 Ma (monazite and K-Ar on muscovite) along the Rivera Shear Zone, and finally (4) intrusion of the post-tectonic Sobresaliente and Las Flores granites at around 585 Ma. Lithological similarities, geographic proximity and coeval magmatic and metamorphic events indicate a similar tectonometamorphic evolution for the Isla Cristalina de Rivera, the Valentines Block in Uruguay and the Santa Maria Chico Granulitic Complex in southern Brazil, since at least 2.1 Ga.
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