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Incompatible element
About: Incompatible element is a research topic. Over the lifetime, 2420 publications have been published within this topic receiving 154052 citations.
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TL;DR: In this article, the first-row transition elements (FRTEs) are compatible to moderately incompatible during melting in mafic and ultramafic systems, and thus, are promising to trace lithological heterogeneities in the mantle source regions of basaltic magmas.
200 citations
TL;DR: In this paper, the authors show that there are significant variations in the iron isotope compositions (δ57/54Fe) of mantle rocks (0.9‰) and minerals (olivines 0.6‰), with spinels showing the greatest total variation of 1.7
200 citations
TL;DR: The inter-shield geochemical differences have important implications for plume structure as discussed by the authors, and they are correlated with intershield differences in isotopic ratios, thereby indicating that each shield formed from a compositionally distinct source.
198 citations
TL;DR: In this paper, the authors examined the rheological effect on mantle flow and melting of a ridge-centered mantle plume using three-dimensional numerical models and found that the viscosity increase associated with dehydration prevents buoyancy forces from contributing significantly to plume upwelling above the dry solidus.
198 citations
TL;DR: In this paper, the petrology and geochemistry of basalts dredged at 40-50 km intervals along the Galapagos Spreading Center, between 83/sup 0/W and 101/sup 1/W (40 stations), were reported.
Abstract: We report on the petrology and geochemistry of basalts dredged at 40--50 km intervals along the Galapagos Spreading Center, between 83/sup 0/W and 101/sup 0/W (40 stations). Emphasis is on spatial variations of 'whole rock' major elements, rare earths, trace metals of the first transition series, and the nature of phenocryst assemblages and their abundances. These results provide new constraints on the nature and scale of mantle source heterogeneities, melting conditions, thermal field, and dynamics of crustal formation of the region. We suggest that ridge segments outside the high magnetic amplitude zone are at a steady state as a result of passive seafloor spreading. Basalts from these segments are apparently derived from an asthenosphere relatively uniformally depleted in incompatible elements, which appears of worldwide extent. We reject Vogt and DeBoer's (1976) model invoking damming at fracture zones of subaxial asthenosphere flow of crystal slushes and increasing fractional crystallization down the flow line, because this model would not explain the gradients in REE observed about the Galapagos Platform. Our preferred model combines the mantle-plume binary mixing model of Schilling (1973) with the concept of recurring rift propagation proposed by Hey (1977a). We further propose that pulsating mantle plume flux, perhaps inmore » the form of a chain of blobs, may initiate the development of new rifts and their propagation. The present position of the tips of such new propagating rifts locate the wave fronts of such pulsating mantle plume flow. A two million year period is suggested for the last 4 m.y. from Wilson and Hey's (1979) information Rigorous testing of our preferred model is possible.« less
197 citations