A LREE-depleted component in the Afar plume; further evidence from Quaternary Djibouti basalts

doi:10.1016/J.LITHOS.2009.09.008

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A LREE-depleted component in the Afar plume; further evidence from Quaternary Djibouti basalts

Journal Article•DOI•

A LREE-depleted component in the Afar plume; further evidence from Quaternary Djibouti basalts

Mohamed Ahmed Daoud¹, René C. Maury¹, Jean-Alix Barrat¹, Rex N. Taylor², Bernard Le Gall¹, Hervé Guillou³, Joseph Cotten¹, Joël Rolet¹ - Show less +4 more•Institutions (3)

European University of Brittany¹, University of Southampton², Centre national de la recherche scientifique³

01 Feb 2010-Lithos (Elsevier)-Vol. 114, Iss: 3, pp 327-336

TL;DR: 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.

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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.

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Figures (8)

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 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

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Journal Article•DOI•

Geochemistry of Woranso–Mille Pliocene basalts from west-central Afar, Ethiopia: Implications for mantle source characteristics and rift evolution

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Mulugeta Alene¹, William K. Hart², Beverly Z. Saylor³, Alan L. Deino⁴, Stanley A. Mertzman⁵, Yohannes Haile-Selassie⁶, Luis Gibert⁷ - Show less +3 more•Institutions (7)

Addis Ababa University¹, Miami University², Case Western Reserve University³, Berkeley Geochronology Center⁴, Franklin & Marshall College⁵, Cleveland Museum of Natural History⁶, University of Barcelona⁷

01 Jun 2017-Lithos

TL;DR: The Woranso-Mille (WORMIL) area in the west-central Afar, Ethiopia, contains several Pliocene basalt flows, tuffs, and fossiliferous volcaniclastic beds as mentioned in this paper.

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12 citations

Journal Article•DOI•

Transition from Plume-driven to Plate-driven Magmatism in the Evolution of the Main Ethiopian Rift

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Dejene Hailemariam Feyissa¹, Hiroshi Kitagawa¹, Tesfaye Demissie Bizuneh¹, Ryoji Tanaka¹, Kurkura Kabeto¹, Eizo Nakamura¹ - Show less +2 more•Institutions (1)

Okayama University¹

12 Sep 2019-Journal of Petrology

TL;DR: In this paper, K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data are presented for Oligocene to recent mafic volcanic rocks from the Ethiopian Plateau, the Main Ethiopian Rift (MER), and the Afar depression.

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Abstract: New K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data are presented for Oligocene to recent mafic volcanic rocks from the Ethiopian Plateau, the Main Ethiopian Rift (MER), and the Afar depression. Chronological and geochemical data from this study are combined with previously published datasets to reveal secular variations in magmatism throughout the entire Ethiopian volcanic region. The mafic lavas in these regions show variability in terms of silica-saturation (i.e. alkaline and sub-alkaline series) and extent of differentiation (mafic through intermediate to felsic). The P-T conditions of melting, estimated using the least differentiated basalts, reveal a secular decrease in the mantle potential temperature, from when the flood basalt magmas erupted (up to 1600 degrees C) to the time of the rift-related magmatism (<1500 degrees C). Variations in the Sr-Nd-Pb isotopic compositions of the mafic lavas can account for the involvement of multiple end-member components. The relative contributions of these end-member components vary in space and time owing to changes in the thermal condition of the asthenosphere and the thickness of the lithosphere. The evolution of the Ethiopian rift is caused by a transition from plume-driven to plate-driven mantle upwelling, although the present-day mantle beneath the MER and the Afar depression is still warmer than normal asthenosphere.

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5 citations

Book Chapter•DOI•

Basic Concepts of Geochemistry and Composition of Earth Materials

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Surendra P. Verma¹•Institutions (1)

National Autonomous University of Mexico¹

01 Jan 2020

5 citations

Journal Article•DOI•

Sr–Nd–Pb–Hf isotopic constraints on the diversity of magma sources beneath the Aden Ridge (central Gulf of Aden) and plume–ridge interaction

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Ryuichi Shinjo¹, Daniel Meshesha, Yuji Orihashi², Satoru Haraguchi³, Kensaku Tamaki² - Show less +1 more•Institutions (3)

University of the Ryukyus¹, University of Tokyo², Japan Agency for Marine-Earth Science and Technology³

09 Apr 2015-Journal of Mineralogical and Petrological Sciences

5 citations

Cites background from "A LREE-depleted component in the Af..."

...3–7 (Vidal et al., 1991; Schilling et al., 1992; Barrat et al., 1993, 1998; Deniel et al., 1994; Marty et al., 1993; Chauvel and Blichert–Toft, 2001; Daoud et al., 2010)....
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...LREE–depleted basalts from the Manda Hararo rift in Central Afar (Barrat et al., 2003) also have high 87Sr/86Sr similar to Hayyabley basalts, confirming Daoud et al. (2010)’s suggestion....
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...According to Daoud et al. (2010), Hayyabley basalts from SE Djibouti (Fig....
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...Daoud et al. (2010) concluded that an intrinsically depleted component, which is geochemically distinct from the N–MORBs (i.e., DM source) erupted at the Red Sea and Gulf of Aden oceanic ridges, presents as elongated and narrow filaments within the plume conduit....
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Journal Article•DOI•

Magmatic rifting in the Main Ethiopian Rift began in thick continental lithosphere; the case of the Galema Range

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B. Chiasera¹, Tyrone O. Rooney¹, Ian D. Bastow², Gezahegn Yirgu³, Eric B. Grosfils⁴, Dereje Ayalew³, P. Mohr, James R. Zimbelman⁵, Michael S. Ramsey⁶ - Show less +5 more•Institutions (6)

Michigan State University¹, Imperial College London², Addis Ababa University³, Pomona College⁴, Smithsonian Institution⁵, University of Pittsburgh⁶

14 Oct 2021-Lithos

TL;DR: In this paper, trace element data on 77 samples of Galema range magmas were used to investigate whether magma extension began when the Ethiopian lithosphere was still-thick, or heavily stretched, is unknown.

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4 citations

References

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Chemical and isotopic systematics of oceanic basalt : implications for mantle composition and processes

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S. S. Sun

01 Jan 1989

TL;DR: In this article, trace-element data for mid-ocean ridge basalts and ocean island basalts are used to formulate chemical systematics for oceanic basalts, interpreted in terms of partial-melting conditions, variations in residual mineralogy, involvement of subducted sediment, recycling of oceanic lithosphere and processes within the low velocity zone.

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Abstract: Summary Trace-element data for mid-ocean ridge basalts (MORBs) and ocean island basalts (OIB) are used to formulate chemical systematics for oceanic basalts. The data suggest that the order of trace-element incompatibility in oceanic basalts is Cs ≈ Rb ≈ (≈ Tl) ≈ Ba(≈ W) > Th > U ≈ Nb = Ta ≈ K > La > Ce ≈ Pb > Pr (≈ Mo) ≈ Sr > P ≈ Nd (> F) > Zr = Hf ≈ Sm > Eu ≈ Sn (≈ Sb) ≈ Ti > Dy ≈ (Li) > Ho = Y > Yb. This rule works in general and suggests that the overall fractionation processes operating during magma generation and evolution are relatively simple, involving no significant change in the environment of formation for MORBs and OIBs. In detail, minor differences in element ratios correlate with the isotopic characteristics of different types of OIB components (HIMU, EM, MORB). These systematics are interpreted in terms of partial-melting conditions, variations in residual mineralogy, involvement of subducted sediment, recycling of oceanic lithosphere and processes within the low velocity zone. Niobium data indicate that the mantle sources of MORB and OIB are not exact complementary reservoirs to the continental crust. Subduction of oceanic crust or separation of refractory eclogite material from the former oceanic crust into the lower mantle appears to be required. The negative europium anomalies observed in some EM-type OIBs and the systematics of their key element ratios suggest the addition of a small amount (⩽1% or less) of subducted sediment to their mantle sources. However, a general lack of a crustal signature in OIBs indicates that sediment recycling has not been an important process in the convecting mantle, at least not in more recent times (⩽2 Ga). Upward migration of silica-undersaturated melts from the low velocity zone can generate an enriched reservoir in the continental and oceanic lithospheric mantle. We propose that the HIMU type (eg St Helena) OIB component can be generated in this way. This enriched mantle can be re-introduced into the convective mantle by thermal erosion of the continental lithosphere and by the recycling of the enriched oceanic lithosphere back into the mantle.

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19,221 citations

"A LREE-depleted component in the Af..." refers background in this paper

...The primitive mantle values are from Sun and McDonough (1989)....
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...Major oxides in wt%, trace elements in ppm. n denotes 849 ratios normalized to the primitive mantle composition from Sun and McDonough (1989)....
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...Major oxides in wt%, trace elements in ppm. n denotes 4 ratios normalized to the primitive mantle composition from Sun and McDonough (1989).5 6 207Pb/204Pb and 208Pb/204Pb ratios with respect to the Northern Hemisphere Reference 3 Table 4 Click here to download Table: Hayy_Table 4nb.doc...
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...Moreover, they show a limited range of Ce/Pb ratios from 24 to 350 28, similar to values measured in oceanic basalts (e.g., Sun and McDonough, 1989)....
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Journal Article•DOI•

Chemical and isotopic systematics of oceanic basalts. Implications for Mantle Composition and Processes

[...]

Shen-Su Sun¹, Shen-Su Sun², William F. McDonough¹, William F. McDonough³•Institutions (3)

Australian National University¹, Geoscience Australia², Max Planck Society³

01 Jan 1989-Geological Society, London, Special Publications

19,009 citations

Journal Article•DOI•

Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology

[...]

R.H. Steiger, E. Jäger

01 Oct 1977-Earth and Planetary Science Letters

TL;DR: The IUGS Subcommission on Geochronology (FOOTNOTE 4) as discussed by the authors recommended the adoption of a standard set of decay constants and isotopic abundances in isotope geology.

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9,474 citations

"A LREE-depleted component in the Af..." refers methods in this paper

...87 Ages were calculated using the constants recommended by Steiger and Jäger (1977)....
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Journal Article•DOI•

A large-scale isotope anomaly in the Southern Hemisphere mantle

[...]

Stanley R. Hart¹•Institutions (1)

Massachusetts Institute of Technology¹

28 Jun 1984-Nature

TL;DR: The authors showed that the isotopic mantle anomaly is globe-encircling in extent, centred on latitude 30° S. They also showed that this mantle anomaly has been in existence for billions of years and placed severe constraints on mantle convection models.

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Abstract: Basalts from many Southern Hemisphere regions have anomalous Sr and Pb isotopic characteristics. This article shows that the isotopic mantle anomaly is globe-encircling in extent, centred on latitude 30° S. Arguments suggesting that this mantle anomaly has been in existence for billions of years place severe constraints on mantle convection models.

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2,321 citations

"A LREE-depleted component in the Af..." refers background in this paper

...Δ7/4 and Δ 8/4 denote the deviation (in 853 0 /00) of 207 Pb/ 204 Pb and 208 Pb/ 204 Pb ratios with respect to the Northern Hemisphere Reference 854 Line (NHRL: Hart, 1984, 1988)....
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...1600 km east of Hayyabley volcano (Hart, 1984) but do extend away from the Indian Ocean MORB toward a more HIMU composition....
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...The Hayyabley basalts display almost uniform Pb isotopic 285 compositions ( 206 Pb/ 204 Pb= 18.47-18.55, 207 Pb/ 204 Pb= 15.52-15.57, 208 Pb/ 204 Pb= 38.62-38.77) 286 well above the NHRL (Hart, 1984, 1988; see Table 4)....
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...These submarine basalts do not have the unradiogenic Pb isotopes of the 390 Carslberg Ridge ca. 1600 km east of Hayyabley volcano (Hart, 1984) but do extend away 391 from the Indian Ocean MORB toward a more HIMU composition....
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Journal Article•DOI•

Rare-earth abundances in chondritic meteorites

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N. M. Evensen¹, P. J. Hamilton¹, R.K. O'Nions¹•Institutions (1)

Columbia University¹

01 Aug 1978-Geochimica et Cosmochimica Acta

TL;DR: In this article, 15 chondrites, including eight carbonaceous chondites, were analyzed for rare earth element abundances by isotope dilution, and the persistence of anomalies in chondritic materials relatively removed from direct condensational processes implies that anomalous components were introduced at a late stage of chondrite formation.

...read moreread less

1,346 citations