Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton

Abstract

Research Article| March 01, 2010 Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton E. Tohver; E. Tohver * 1School of Earth and Environment, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia *E-mail: etohver@cyllene.uwa.edu.au. Search for other works by this author on: GSW Google Scholar R.I.F. Trindade; R.I.F. Trindade 2Instituto de Astronomia e Geofísica, Universidade de São Paulo, Rua Maria Antônia, 294 São Paulo, SP 01222010, Brazil Search for other works by this author on: GSW Google Scholar J.G. Solum; J.G. Solum 3Shell Exploration, Bellaire Technology Center, Shell International Exploration and Production, 3737 Bellaire Blvd, Houston, Texas 77025, USA Search for other works by this author on: GSW Google Scholar C.M. Hall; C.M. Hall 4Department of Geological Sciences, University of Michigan, 2534 C.C. Little Bldg., Ann Arbor, Michigan 48104, USA Search for other works by this author on: GSW Google Scholar C. Riccomini; C. Riccomini 5Instituto de Geociências, Universidade de São Paulo, Rua Maria Antônia, 294 São Paulo, SP 01222010, Brazil Search for other works by this author on: GSW Google Scholar A.C. Nogueira A.C. Nogueira 6Instituto de Geociências, Universidade de Pará, Rua Augusto Corrêa, 01-Guamá, CEP 66075-110, Brazil Search for other works by this author on: GSW Google Scholar Geology (2010) 38 (3): 267–270. https://doi.org/10.1130/G30510.1 Article history received: 08 Jul 2009 rev-recd: 19 Oct 2009 accepted: 20 Oct 2009 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation E. Tohver, R.I.F. Trindade, J.G. Solum, C.M. Hall, C. Riccomini, A.C. Nogueira; Closing the Clymene ocean and bending a Brasiliano belt: Evidence for the Cambrian formation of Gondwana, southeast Amazon craton. Geology 2010;; 38 (3): 267–270. doi: https://doi.org/10.1130/G30510.1 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 We report new paleomagnetic and geochronological data from Ediacaran rift-drift carbonates in the Paraguai belt at the southern end of the suture zone between the Amazon craton and the São Francisco and Rio de Plata cratons, South America. Early thrusting resulted in remagnetization ca. 528 ± 36 Ma or later; the mean age is established by 40Ar/39Ar encapsulation dating of mixed authigenic and detrital illite from remagnetized carbonates from the unmetamorphosed fold-thrust belt. This remagnetization overlaps with a 525 Ma Gondwana reference pole. Metamorphic illite from the slate belt yields 40Ar/39Ar ages of 496–484 Ma, the timing of peak regional metamorphism. Oroclinal bending of the Paraguai belt was caused by a 90° clockwise rotation of the east-west limb after ca. 528 Ma, probably reflecting the irregular margin of the southeast Amazon craton. The age of the Paraguai belt overlaps with that of the Pampean orogeny farther south along the western margin of the Rio de Plata craton, suggesting a coeval closure for the Clymene ocean separating the Amazon craton from the São Francisco and Rio de Plata cratons. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.