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Late Miocene onset of the Amazon River and the Amazon deep-sea fan: Evidence from the Foz do Amazonas Basin

2009; Geological Society of America; Volume: 37; Issue: 7 Linguagem: Inglês

10.1130/g25567a.1

1943-2682

J. Figueiredo, Carina Hoorn, P. van der Ven, Emílio Alberto Amaral Soares,

Geology and Paleoclimatology Research

Research Article| July 01, 2009 Late Miocene onset of the Amazon River and the Amazon deep-sea fan: Evidence from the Foz do Amazonas Basin J. Figueiredo; J. Figueiredo * 1Department of Earth and Ocean Science, University of Liverpool, 4 Brownlow Street, L69 3GP Liverpool, UK 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil *E-mails: j.figueiredo@liv.ac.uk; picanco@petrobras.com.br. Search for other works by this author on: GSW Google Scholar C. Hoorn; C. Hoorn 3Institute for Biodiversity and Ecosystem Analysis, University of Amsterdam, 1098 SM Amsterdam, Netherlands Search for other works by this author on: GSW Google Scholar P. van der Ven; P. van der Ven 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil Search for other works by this author on: GSW Google Scholar E. Soares E. Soares 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information J. Figueiredo * 1Department of Earth and Ocean Science, University of Liverpool, 4 Brownlow Street, L69 3GP Liverpool, UK 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil C. Hoorn 3Institute for Biodiversity and Ecosystem Analysis, University of Amsterdam, 1098 SM Amsterdam, Netherlands P. van der Ven 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil E. Soares 2Petroleo Brasileiro SA (Petrobras), Rio de Janeiro, Brazil *E-mails: j.figueiredo@liv.ac.uk; picanco@petrobras.com.br. Publisher: Geological Society of America Received: 27 Oct 2008 Revision Received: 18 Feb 2009 Accepted: 25 Feb 2009 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (7): 619–622. https://doi.org/10.1130/G25567A.1 Article history Received: 27 Oct 2008 Revision Received: 18 Feb 2009 Accepted: 25 Feb 2009 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. Figueiredo, C. Hoorn, P. van der Ven, E. Soares; Late Miocene onset of the Amazon River and the Amazon deep-sea fan: Evidence from the Foz do Amazonas Basin. Geology 2009;; 37 (7): 619–622. doi: https://doi.org/10.1130/G25567A.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 New biostratigraphic, isotopic, and well log data from exploration wells on the outer continental shelf and uppermost Amazon deep-sea fan, Brazil, reveal that the Amazon River was initiated as a transcontinental river between 11.8 and 11.3 Ma ago (middle to late Miocene), and reached its present shape and size during the late Pliocene. Prior to the late Miocene the continental shelf was a carbonate platform that received moderate siliciclastic sediment supply from the Proterozoic basement in eastern Amazonia. Average sedimentation rates on the Amazon Fan show three stages of development: (1) 11.8–6.8 Ma ago, low sedimentation rates (0.05 m/ka) prevailed on the fan, because the Amazon River was not yet entrenched and some sediments were partially trapped in continental basins; (2) 6.8–2.4 Ma ago, sedimentation rates (0.3 m/ka) increased, the river entrenched, and deposition fully migrated onto the Amazon Fan; (3) 2.4 Ma ago to the present, very high sedimentation rates (1.22 m/ka, with peaks of 11 m/ka) prevailed on the fan and the modern Amazon River developed. All these paleogeographic and depositional events are closely related to Andean tectonism (late Miocene–Pliocene) and were exacerbated by global cooling and sea-level fall during the late Miocene. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.