The Nico Perez terrane (Uruguay) and its archean and paleoproterozoic inheritance

Autor(es)

Bettucci, Leda Sanchez ^[1] ; Cordani, Umberto ^[2] ; Loureiro, Judith ^[3] ; Peel, Elena ^[1] ; Fort, Santiago ^[1] ; Sato, Kei ^[2]

Afiliação do(s) autor(es)

^[1] Univ Republica, Fac Ciencias, Igua 4225 Esquina Mataojo, Montevideo 11400 - Uruguay

^[2] Univ Sao Paulo, Inst Geociencias, R Lago 562, BR-05508080 Butanta, SP - Brazil

^[3] Direcc Nacl Min & Geol MIEM, Hervidero 2861, Montevideo - Uruguay

• Tipo de documento: Artigo Científico
• Fonte: ANDEAN GEOLOGY; v. 48, n. 3, p. 442-471, SEP 2021.
• Citações Web of Science: 0

Resumo

A U-Pb SHRIMP zircon geochronological study was carried out in the Nico Perez Terrane in the central eastern portion of Uruguay with the aim of constraining its geological evolution and its cratonic affinity. Nico Perez Terrane is made up by a mosaic of tectonic blocks with diferente lithologies and sizes. This terrane is limited to the west by the Piedra Alta Terrane through the Sarandi del Yi shear zone, and to the east, is in tectonic contact through the Retamosa thrust with the Dom Feliciano Belt (Brasiliano orogenic cycle). Lithologically, the Nico Perez Terrane is composed by medium to high grade metamorphic rock contained in three tectonic blocks (Pavas, Valentines and Rivera blocks) represented mainly by granitoids, as well as ortho and parametamorphic rocks, such as amphibolites, metapyroxenites, BIFs, schists, quartzites with fuchsite, among others. Archean inheritance, Rhyacian, Statherian, and Neoproterozoic magmatic ages are reported here. Similar ages, which show Archaean inheritance and Neoproterozoic imprint, reported in units of the Piedra Alta Terrane modify the idea that the Rio de La Plata Craton only corresponds to a juvenile Paleoproterozoic tectonic unit. This, together with recently published geophysical information, supports the cratonic affinity of the Nico Perez Terrane with the Rio de La Plata Craton. (AU)

• Processo FAPESP: 13/12754-0 - Geocronologia de precisão pelos métodos U-Pb SHRIMP e LA-ICP-MS em zircão: contribuição para o aprimoramento do conhecimento da evolução tectônica da América do Sul
• Beneficiário: Umberto Giuseppe Cordani
• Modalidade de apoio: Auxílio à Pesquisa - Regular