Juvenile accretion at 750–700 Ma in southern Brazil

Research Article| May 01, 1996 Juvenile accretion at 750–700 Ma in southern Brazil Marly Babinski; Marly Babinski 1Instituto de Geociências, Universidade de São Paulo, Caixa Postal 11348, São Paulo, São Paulo 05422-970, Brazil Search for other works by this author on: GSW Google Scholar Farid Chemale, Jr; Farid Chemale, Jr 2Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar Léo A. Hartmann; Léo A. Hartmann 2Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar W. R. Van Schmus; W. R. Van Schmus 3Department of Geology, University of Kansas, Lawrence, Kansas 66045 Search for other works by this author on: GSW Google Scholar Luiz Carlos da Silva Luiz Carlos da Silva 4CPRM/Brazilian Geological Survey, Porto Alegre, Rio Grande do Sul, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Marly Babinski 1Instituto de Geociências, Universidade de São Paulo, Caixa Postal 11348, São Paulo, São Paulo 05422-970, Brazil Farid Chemale, Jr 2Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil Léo A. Hartmann 2Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil W. R. Van Schmus 3Department of Geology, University of Kansas, Lawrence, Kansas 66045 Luiz Carlos da Silva 4CPRM/Brazilian Geological Survey, Porto Alegre, Rio Grande do Sul, Brazil Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (5): 439–442. https://doi.org/10.1130/0091-7613(1996)024<0439:JAAMIS>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Marly Babinski, Farid Chemale, Léo A. Hartmann, W. R. Van Schmus, Luiz Carlos da Silva; Juvenile accretion at 750–700 Ma in southern Brazil. Geology 1996;; 24 (5): 439–442. doi: https://doi.org/10.1130/0091-7613(1996)024<0439:JAAMIS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Juvenile, mantle-derived complexes are relatively rare in the late Neoproterozoic Brasiliano orogenic belts of western Gondwana, which consist primarily of reworked older crust. The Vila Nova belt in the São Gabriel block of the southern Mantiqueira province, southern Brazil, consists of granodioritic to tonalitic gneisses (Cambaí group) and deformed basaltic to rhyolitic volcanic rocks and sedimentary rocks (Vacacaí supergroup). U-Pb zircon data show that plutonic and volcanic rocks of both groups formed between 750 and 700 Ma. Sm-Nd model ages range from 1000 to 800 Ma with positive ϵNd(t) values, identifying the Vila Nova belt as a juvenile terrane. We postulate that 1000–800 Ma oceanic crust was subducted eastward below a Transamazonian (2100 Ma) craton; this process formed supracrustal rocks of the Vacacaí supergroup and plutons and supracrustal rocks of the Cambaí group and caused associated deformation. This juvenile terrane represents another tectonic marker for defining the earlier stages of western Gondwana assembly. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.