Research Article| April 01, 1986 Role of subducted sediment in the genesis of ocean-island basalts: Geochemical evidence from South Atlantic Ocean islands Barry L. Weaver; Barry L. Weaver 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019 Search for other works by this author on: GSW Google Scholar David A. Wood; David A. Wood 2Amoco Europe and West Africa Inc., Amoco House, 1 Stephen Street, Tottenham Court Road, London W1P2AU, England Search for other works by this author on: GSW Google Scholar John Tarney; John Tarney 3Department of Geology, University of Leicester, Leicester LE1 7RH, England Search for other works by this author on: GSW Google Scholar Jean Louis Joron Jean Louis Joron 4Group des Sciences de la Terre, Laboratoire Pierre Sue, C.N.R.S., Centre d'Etudes Nucléaires de Saclay B.P. 2, 91190 Gif-Sur-Yvette, France Search for other works by this author on: GSW Google Scholar Geology (1986) 14 (4): 275–278. https://doi.org/10.1130/0091-7613(1986)14<275:ROSSIT>2.0.CO;2 Article history first online: 01 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 Barry L. Weaver, David A. Wood, John Tarney, Jean Louis Joron; Role of subducted sediment in the genesis of ocean-island basalts: Geochemical evidence from South Atlantic Ocean islands. Geology 1986;; 14 (4): 275–278. doi: https://doi.org/10.1130/0091-7613(1986)14<275:ROSSIT>2.0.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 The South Atlantic Ocean islands of Ascension, Bouvet, St. Helena, Gough, and Tristan da Cunha display considerable inter-island (and to a variable extent intra-island) heterogeneity in ratios of highly incompatible trace elements. Basaltic and hawaiitic lavas from Ascension, Bouvet, and St. Helena have consistent trace-lenient ratios (e.g., La/Nb, Ba/Nb, Ba/La, Ba/Th, Rb/Th). In contrast, Tristan da Cunha and Gough (and Walvis Ridge) lavas are depleted in Nb and enriched in Ba relative to other highly incompatible trace elements as compared to the other islands. The trace-element and Pb isotopic geochemistry of these lavas is explicable by contamination of the ocean-island basalt source that gave rise to Ascension, Bouvet, and St. Helena lavas by variable, but small (about 1%), amounts of ancient (1.5–2.0 Ga) pelagic sediment. 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.