Journal ArticleDOI
Can Kimberlites be generated from an ordinary mantle
TLDR
In this article, a comparison of clinopyroxene megacrysts with existing kimberlite data was made, and it was shown that low crystal-liquid partition coefficients for the rare earths are plausible.Abstract:
Kimberlites are characterized by a high concentration of incompatible elements, including light rare earths. However, Nd isotopic evidence indicates that their source regions do not have a long history of enrichment. If kimberlites can be generated from non-enriched mantle sources by simple partial melting processes, this implies that crystal–liquid partition coefficients for some trace elements are lower for kimberlitic liquids than for basalts or andesites. From a comparison of clinopyroxene megacrysts (regarded as equilibrated with kimberlite at depth) with existing kimberlite data we argue here that low crystal–liquid partition coefficients for the rare earths are plausible.read more
Citations
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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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Origin of diamonds in old enriched mantle
TL;DR: Sub-calcic garnets encapsulated by diamonds from relatively young (90 Myr) kimberlites in southern Africa, yield ancient Sm-Nd and Rb-Sr model ages (3,200-3,300 Myr) as mentioned in this paper.
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Pb, Sr and Nd isotopic evidence for sources of southern African Cretaceous kimberlites
TL;DR: In this paper, the authors present new whole-rock Pb, Sr and Nd isotopic analyses of examples of both types of kimberlite which, in conjunction with previously published data, confirm the existence of both depleted and enriched upper mantle sources for southern African Cretaceous kimbersites.
References
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Partition coefficients of rare-earth elements between igneous matrix material and rock-forming mineral phenocrysts—II
TL;DR: In this paper, solid-liquid partition coefficients between phenocrysts and the host lavas have been measured for rare-earth elements by an isotope dilution technique and the consistency of much of the data suggests that most of the phenocryst crystallized under equilibrium, or quasi-equilibrium, conditions.
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A review of experimental studies of crystal/liquid trace element partitioning
TL;DR: Experimental techniques for examining trace element behavior are reviewed in this paper, and applications of these techniques are described for a variety of partition coefficients including: olivine/liquid, subcalcic pyroxene/ liquid, calcic pyrosene/liquid and perovskite/liquid.
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Phenocryst-matrix partition coefficients for K, Rb, Sr and Ba, with applications to anorthosite and basalt genesis
TL;DR: Partition coefficients for K, Rb, Sr, and Ba distributed between plagioclase, K-feldspar, clinopyroxene, orthopyroxenes, mica, hornblende, garnet, and olivine phenocrysts and their igneous matrix materials, have been determined by a mass-spectrometric stable isotope dilution technique.
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Trace element partition between two pyroxenes and the host lava
TL;DR: Partition coefficients for +1, +2, +3 and +4 valent trace ions between alkaline olivine basalt lava and the coexisting ortho- and clinopyroxene phenocrysts from Takashima, North Kyushu, Japan, have been determined by neutron activation analysis as mentioned in this paper.
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Petrogenetic mixing models and Nd-Sr isotopic patterns
TL;DR: The possible Nd and Sr isotopic variations which would result from assimilation of continental crust by mantle-derived magmas can be systematized by considering the chemical and isotopic compositions of the magmas and models for layering within the continental crust as mentioned in this paper.