Isotope geochemistry and geochronology of the Nico Pérez Terrane, Rio de la Plata Craton, Uruguay

Mallmann G., Chemale Jr. F., Avila J.N., Kawashita K. and Armstrong R.A. (2007) Isotope geochemistry and geochronology of the Nico Pérez Terrane, Rio de la Plata Craton, Uruguay. Gondwana Research, 12 4: 489-508. doi:10.1016/j.gr.2007.01.002


Author Mallmann G.
Chemale Jr. F.
Avila J.N.
Kawashita K.
Armstrong R.A.
Title Isotope geochemistry and geochronology of the Nico Pérez Terrane, Rio de la Plata Craton, Uruguay
Journal name Gondwana Research   Check publisher's open access policy
ISSN 1342-937X
Publication date 2007-01-01
Sub-type Article (original research)
DOI 10.1016/j.gr.2007.01.002
Open Access Status
Volume 12
Issue 4
Start page 489
End page 508
Total pages 20
Language eng
Subject 1901 Art Theory and Criticism
Abstract U-Pb SHRIMP zircon geochronology, bulk-rock geochemistry, and Sr-Nd isotopic data are herein presented in order to better constrain the tectonic evolution of the Nico Pérez Terrane (NPT), Uruguay. The studies are focused on two key geological units located in the southern part of the NPT, namely Carapé Complex (CC) and Lavalleja Metamorphic Complex (LMC). The Carapé Complex, previously interpreted as part of a remnant magmatic arc, formed at 1.75 Ga mainly by partial melting of Archean crust (T DM model ages between 2.8 and 3.0 Ga with strong negative ε Nd (t) values). The Lavalleja Metamorphic Complex, previously interpreted as a back-arc basin, has volcanic units formed at 0.59 Ga during the Brasiliano Cycle, but may also contain older (Paleoproterozoic) units. The geochemistry of the LMC meta-igneous rocks indicates a complex scenario. Two distinct signatures have been recognized, one similar to MORBs and the other similar OIBs. Sm-Nd T DM model ages of basic rocks present a bimodal (Paleoproterozoic and Archean) distribution, which is also recognized in several other units of the NPT. In the light of new results, we conclude that the NPT represents a cratonic margin setting, characterized by the stacking of lithotectonic assemblages with Archean, Paleoproterozoic, and Neoproterozoic age at the margin of the Rio de la Plata Craton.
Keyword Brasiliano
South America
Sr-Nd isotopes
Tectonics
U-Pb geochronology
Western Gondwana
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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