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• W1980548526 abstract "Research Article| February 01, 1991 Ninetyeast Ridge (Indian Ocean): A 5000 km record of a Dupal mantle plume D. Weis; D. Weis 1Laboratoires Associés de Géologie-Pétrologie-Géochronologie, Université Libre de Bruxelles, Avenue F. D. Roosevelt, 50 1050-Brussels, Belgium Search for other works by this author on: GSW Google Scholar F. A. Frey; F. A. Frey 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar A. Saunders; A. Saunders 3Department of Geology, University of Leicester, Leicester LE1 7RH, England Search for other works by this author on: GSW Google Scholar I. Gibson I. Gibson 4Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information D. Weis 1Laboratoires Associés de Géologie-Pétrologie-Géochronologie, Université Libre de Bruxelles, Avenue F. D. Roosevelt, 50 1050-Brussels, Belgium F. A. Frey 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 A. Saunders 3Department of Geology, University of Leicester, Leicester LE1 7RH, England I. Gibson 4Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (2): 99–102. https://doi.org/10.1130/0091-7613(1991)019<0099:NRIOAK>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 Email Permissions Search Site Citation D. Weis, F. A. Frey, A. Saunders, I. Gibson; Ninetyeast Ridge (Indian Ocean): A 5000 km record of a Dupal mantle plume. Geology 1991;; 19 (2): 99–102. doi: https://doi.org/10.1130/0091-7613(1991)019<0099:NRIOAK>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 Data and observation from Drifting Program Leg 121 and plate-tectonic reconstructions indicate that the Ninetyeast Ridge (Indian Ocean) was derived from the interaction of a deep-seated Dupal hotspot and a nearby spreading-ridge axis. The 5000-km-long ridge, from lat 34°S to Rat 10°N, was drilled at three sites during Leg 121. About 178 m of basalt, >38 to >80 Ma, were recovered from a total penetration of ∼310 m. Shipboard petrographic and geochemical studies showed that each site has distinctive characteristics. Most of the cored lavas have a tholeiitic basalt composition. Incompatible-element abundanes and ratios show systematic trends, consistent with an origin for the Ninetyeast Ridge lavas by mixing between a depleted component-Indian Ocean mid-ocean ridge basalt-and an enriched component-oceanic-island basalt similar to that observed in the youngest alkalic basalts from the Kerguelen archipelago. Preliminary shore-based trace element abundance and isotopic data are compatible with this hypothesis, although Pb isotopes indicate the involvement of another component.The long-lasting and more or less continuous activity of the Kerguelen-Heard plume (ca. 115 Ma), now located under Heard Island, south of the Southeast Indian Ridge, provides evidence that the source of the Dupal anomaly is deep seated. 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." @default.
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• W1980548526 title "Ninetyeast Ridge (Indian Ocean): A 5000 km record of a Dupal mantle plume" @default.
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