The basement of the Punta del Este Terrane (Uruguay): an African Mesoproterozoic fragment at the eastern border of the South American Rio de La Plata craton

Autor(es)

Basei, Miguel A. S. ^[1] ; Peel, Elena ^{[1, 2]} ; Sanchez Bettucci, Leda ^[2] ; Preciozzi, Fernando ^[3] ; Nutman, Allen P. ^{[4, 5]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Geociencias, BR-01498 Sao Paulo - Brazil

^[2] Univ Republ Oriental Uruguay, Dept Geol, Fac Ciencias, Inst Geol & Palaeontol, Montevideo 11400 - Uruguay

^[3] Direcc Nacl Mineria & Geol, Montevideo 2861 - Uruguay

^[4] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200 - Australia

^[5] Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522 - Australia

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF EARTH SCIENCES; v. 100, n. 2-3, p. 289-304, APR 2011.
• Citações Web of Science: 30

Resumo

The Punta del Este Terrane (eastern Uruguay) lies in a complex Neoproterozoic (Brasiliano/Pan-African) orogenic zone considered to contain a suture between South American terranes to the west of Major Gercino-Sierra Ballena Suture Zone and eastern African affinities terranes. Zircon cores from Punta del Este Terrane basement orthogneisses have U-Pb ages of ca. 1,000 Ma, which indicate an lineage with the Namaqua Belt in Southwestern Africa. U-Pb zircon ages also provide the following information on the Punta del Este terrane: the orthogneisses containing the ca. 1,000 Ma inheritance formed at ca. 750 Ma; in contrast to the related terranes now in Africa, reworking of the Punta del Este Terrane during Brasiliano/Pan-African orogenesis was very intense, reaching granulite facies at ca. 640 Ma. The termination of the Brasiliano/Pan-African orogeny is marked by formation of acid volcanic and volcanoclastic rocks at ca. 570 Ma (Sierra de Aguirre Formation), formation of late sedimentary basins (San Carlos Formation) and then intrusion at ca. 535 Ma of post-tectonic granitoids (Santa Teresa and Jos, Ignacio batholiths). The Punta del Este Terrane and unrelated western terranes represented by the Dom Feliciano Belt and the Rio de La Plata Craton were in their present positions by ca. 535 Ma. (AU)

• Processo FAPESP: 05/58688-1 - A América do Sul no contexto dos supercontinentes: fusão e fissão
• Beneficiário: Miguel Angelo Stipp Basei
• Modalidade de apoio: Auxílio à Pesquisa - Temático