Journal ArticleDOI
Pb–Sr–Nd isotopic correlation and the chemistry of the North Atlantic mantle
Bernard Dupré,Claude J. Allègre +1 more
TLDR
The Pb, Sr, Nd isotopic composition in North Atlantic mid-oceanic ridge basalts has been measured in this article and a positive correlation is found between Sr and Pb and a negative one between Nd and Sr.Abstract:
The Pb, Sr, Nd isotopic composition in North Atlantic mid-oceanic ridge basalts has been measured. A positive correlation is found between Sr and Pb and a negative one between Nd and Sr. There is also a negative correlation between Hf/Th or Ta/Th and isotopic ratios such as 87Sr/86Sr or 206Pb/204Pb. Using the data for oceanic island basalts with these coherent geochemical characteristics we discuss the origin of chemical variations in the North Atlantic mantle and the problem of the mantle geochemistry.read more
Citations
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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.
Journal ArticleDOI
A neodymium and strontium isotopic study of the Mesozoic calc‐alkaline granitic batholiths of the Sierra Nevada and Peninsular Ranges, California
TL;DR: In this paper, the authors show that the concentration of Nd correlates well with eNd in the batholith rocks and support the conclusion that juvenile continental crust is derived from mantle reservoirs that are depleted in incompatible elements.
Journal ArticleDOI
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.
Journal ArticleDOI
Noble Gas Isotope Geochemistry of Mid-Ocean Ridge and Ocean Island Basalts: Characterization of Mantle Source Reservoirs
TL;DR: In the terrestrial environment, the abundances of noble gases are quite low because they were excluded from solid materials during planetary formation in the inner solar system, which makes the noble gases excellent tracers of mantle reservoirs as mentioned in this paper.
Journal ArticleDOI
The O, Sr, Nd and Pb isotope geochemistry of MORB
TL;DR: In this paper, the authors report analyses of O, Sr, Nd and Pb isotope ratios in 52 fresh glasses of mid-ocean ridge basalt (MORB).
References
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Journal ArticleDOI
Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites
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A general mixing equation with applications to Icelandic basalts
TL;DR: The mixing equation applied by Vollmer [1] to Pb and Sr isotope ratios is shown to be a general equation applicable to consideration of element and isotope ratio.
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143Nd/146Nd, a natural tracer: an application to oceanic basalts*
TL;DR: In this paper, the possibility of using 143Nd/146Nd as a natural tracer was examined by analyzing two Hercynian granitic rocks, one carbonatite, three alkali basalts and nine tholeiites.
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Iceland Mantle Plume: Geochemical Study of Reykjanes Ridge
TL;DR: In this article, rare earth and minor element concentration variations in basalt recently erupted along the postglacial Reykjanes Ridge Axis and its northward extension over Iceland reflect the existence, spatial influence, and primordial nature of the Iceland hot mantle plume.
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Variations in143Nd/144Nd and87Sr/86Sr ratios in oceanic basalts
TL;DR: In this article, a strong negative correlation exists between 87Sr/86Sr ratios in oceanic basalt from Iceland and the Reykjanes Ridge, but such a clear correlation does not exist for samples from the Hawaiian Islands.