Journal ArticleDOI
A possible new Sr-Nd-Pb mantle array and consequences for mantle mixing
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TLDR
The LoNd array is defined by basalts from Tubuaii, St Helena, New England Seamounts, Comores, San Felix and Walvis Ridge.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1986-07-01. It has received 244 citations till now. The article focuses on the topics: Mantle wedge & Transition zone.read more
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Chemical and isotopic systematics of oceanic basalt : implications for mantle composition and processes
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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Chemical and isotopic systematics of oceanic basalts. Implications for Mantle Composition and Processes
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The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system
TL;DR: In this paper, the authors obtained a new set of present-day mean values in chondrites of176Hf/177Hf = 0.282772 ± 29 and176Lu/177 Hf= 0.0332 ± 2.
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Mantle Plumes and Entrainment: Isotopic Evidence
TL;DR: Many oceanic island basalts show sublinear subparallel arrays in Sr-Nd-Pb isotopic space, but the depleted upper mantle is rarely a mixing end-member of these arrays, as would be expected if mantle plumes originated at a 670-kilometer boundary layer and entrained upper mantle during ascent.
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Heterogeneous mantle domains: signatures, genesis and mixing chronologies
TL;DR: In this paper, the authors present a data set of over 300 oceanic basalts from 43 oceanic islands or island groups, including the DUPAL belt, and show that 95% of all basalts with a strong DUPAL signature lie between 0° and 50° south latitude.
References
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A large-scale isotope anomaly in the Southern Hemisphere mantle
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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Mantle plumes from ancient oceanic crust
TL;DR: In this article, the authors propose a model for the origin of hot-spot volcanism, where oceanic crust is returned to the mantle during subduction and sinks into the deeper mantle and accumulates at some level of density compensation, possibly the core-mantle boundary.
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Lead isotopic study of young volcanic rocks from mid-ocean ridges, ocean islands and island arcs
TL;DR: Lead isotopic compositions of young volcanic rocks from different tectonic environments have distinctive characteristics their differences are evaluated within the framework of global tectonics and mantle differentiation Ocean island leads are in general more radiogenic than mid-ocean ridge basalt (morb) leads as discussed by the authors.