A LREE-depleted component in the Afar plume; further evidence from Quaternary Djibouti basalts
Mohamed Ahmed Daoud,René C. Maury,Jean-Alix Barrat,Rex N. Taylor,Bernard Le Gall,Hervé Guillou,Joseph Cotten,Joël Rolet +7 more
TLDR
In this paper, trace element and isotopic (Sr, Nd, Pb) data and unspiked K-Ar ages are presented for Quaternary (0.90-0.95 Ma old) basalts from the Hayyabley volcano, Djibouti.About:
This article is published in Lithos.The article was published on 2010-02-01 and is currently open access. It has received 22 citations till now. The article focuses on the topics: Basalt & Trace element.read more
Figures
Table 2 (continued).4 5 
Table 2 (continued).4 5 
Table 3 Click here to download Table: Hayy_Table 3nb.doc 
Table 1. Unspiked 40K-40Ar datings of Hayyabley basalts. See text for the analytical 1 procedures. 2 3 
Table 1.5 
Table 4. Sr, Nd and Pb isotopic compositions of Hayyabley basalts (B: bulk rock; R: residue 1 after leaching). See text for the analytical procedures. Δ7/4 and Δ 8/4 denote the deviation (in 2 0/00) of
Citations
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The size of plume heterogeneities constrained by Marquesas isotopic stripes
Catherine Chauvel,René C. Maury,Sylvain Blais,Eric Lewin,Hervé Guillou,Gérard Guille,Philippe Rossi,Marc-André Gutscher +7 more
TL;DR: In this paper, the authors present new Sr, Nd, Pb, Hf and Hf isotopes as well as trace element data on lavas from several Marquesas Islands and demonstrate that this archipelago consists of two adjacent and distinct rows of islands with significantly different isotopic compositions.
Journal ArticleDOI
Young rift kinematics in the Tadjoura rift, western Gulf of Aden, Republic of Djibouti
TL;DR: In this paper, the Tadjoura rift is interpreted as an asymmetrical south-facing half-gr aben, about 40 km wide, dominated by a large boundary fault zone to the north.
Journal ArticleDOI
The Cenozoic magmatism of East Africa: Part V – Magma sources and processes in the East African Rift
TL;DR: In this paper, the isotopic systematics of East African magmatism reveal significant complexity as to the specific reservoirs that may participate in the melting processes noted above, and the isotope characteristics of magma suites from throughout the region form arrays that broadly converge on the composition of the Afar Plume, despite some complexity where the plume material has formed a hybrid plume-lithosphere component.
Journal ArticleDOI
Palaeoproterozoic Continental MORB-type Tholeiites in the Karelian Craton: Petrology, Geochronology, and Tectonic Setting
A. V. Stepanova,A. V. Samsonov,E. B. Sal’nikova,Igor S. Puchtel,Yu. O. Larionova,A. N. Larionov,V. S. Stepanov,Y. B. Shapovalov,S. V. Egorova +8 more
TL;DR: In this paper, the authors used the results of U^Pb (zircon) and Sm^Nd internal isochron dating for MORB-type tholeiitic dikes in the Karelian Craton, eastern Fennoscandian Shield.
References
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Numerical dating in stratigraphy
TL;DR: In this paper, an up-to-date synthesis of available dara data is presented in order to calibrate, correct and specify the Phanerozoic time scale.
Journal ArticleDOI
Petrology and geochemistry of the Galápagos Islands: Portrait of a pathological mantle plume
TL;DR: The Galfipagos plume has been observed to experience velocity shear in the uppermost asthenosphere of the Nazca plate with respect to the fixed hotspot reference frame as discussed by the authors.
Journal ArticleDOI
Flood and shield basalts from Ethiopia: Magmas from the African superswell
Bruno Kieffer,Nicholas Arndt,Henriette Lapierre,Florence Bastien,Delphine Bosch,Arnaud Pêcher,Gezahegn Yirgu,Dereje Ayalew,Dominique Weis,Dougal A. Jerram,Francine Keller,Claudine Meugniot +11 more
TL;DR: The Ethiopian plateau is made up of several distinct volcanic centres of different ages and magmatic affinities as discussed by the authors, and the three main types of magma have very different major and trace element characteristics ranging from compositions low in incompatible elements in the tholeiites [e.g. 10 ppm La at 7 wt % MgO (=La7), La/εb = 4.2], moderate in the alkali basalts (La7 = 24, La/β = 9.2), and very high in the magnesian alkaline magmas (
Journal ArticleDOI
Origin of anomalous rare-earth element and yttrium enrichments in subaerially exposed basalts: Evidence from French Polynesia
J. Cotten,A. Le Dez,Michael Bau,Martial Caroff,René C. Maury,Peter Dulski,Serge Fourcade,Marcel Bohn,R. Brousse +8 more
TL;DR: In this article, rare-earth elements (REE) and yttrium (Y) were enriched in French Polynesian basaltic sequences, indicating a close relationship to supergene processes.
Journal ArticleDOI
The heterogeneous Iceland plume: Nd-Sr-O isotopes and trace element constraints
Christophe Hémond,Nicholas Arndt,Uwe Lichtenstein,Albrecht W. Hofmann,Niels Oskarsson,Sigurdur Steinthorsson +5 more
TL;DR: In this paper, a comprehensive set of Sr, Nd, and O isotope data and trace element concentrations from tholeiitic and alkaline lavas of the neovolcanic zones of Iceland (picrites, olivine and quartz tholesiites, transitional and alkali basalts, differentiated rocks) are presented.