FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2889411657> ?p ?o ?g. }

• W2889411657 endingPage "463" @default.
• W2889411657 startingPage "448" @default.
• W2889411657 abstract "The flux of elements into Earth's sub-continental lithospheric mantle is facilitated by the passage of small-fraction melts that either crystallise new phases or react with pre-existing minerals.Metasomatised peridotite records the end product of this exchange but rarely captures the process in the act due to subsolidus re-equilibration. We present the results of a systematic investigation of a metasomatic melt channel preserved in a mantle peridotite from the Late Cretaceous Bultfontein kimberlite (Kaapvaal craton) that shows rare direct evidence of the melt-rock reaction processes. We show that the metasomatic proto-kimberlite melt underwent variable crystallisation of clinopyroxene, sulfides, phlogopite, spinel and zircon together with interaction and diffusive exchange with the surrounding olivine-rich mantle. Element profiles across large olivine porphyroclasts (Fo88) show significant core-to-rim variations in Ni (NiO = 0.18–0.32 wt%) and Cr (Cr = 35–60 ppm), while concentrations of all other elements (e.g. Mg, Fe, Mn, Co, V)are remarkably homogeneous. Electron backscatter diffraction analysis shows that the disequilibrium of Ni and Cr is greatest where the crystal contains large components of the [100] and [010] axes. The disequilibrium is preserved in certain orientations because diffusion of Ni and Cr in olivine is more anisotropic than Fe-Mg and Mn, and slower in the [100] and [010] directions. We present the first observations of Ni and Cr decoupling from other elements in mantle olivine and suggest that this is a consequence of: (i)changing mineral-melt concentration gradients associated with the reactive percolation of a precursory kimberlite melt; and (ii) late-stage sulfide and spinel precipitation. We use the diffusion limited re-equilibration of Ni in olivine to quantify the timing of metasomatism prior to xenolith entrainment by the host kimberlite. Our modelling indicates that reactive percolation occurred on the order of 103–105 years prior to entrainment; this provides an additional line of support for the hypothesis that a period of metasomatism by proto-kimberlite melts precedes the final kimberlite ascent to the surface. The broader implication of our finding of variable rates of minor element diffusion in natural olivine is that it highlights the importance of anisotropy and the impact of changing local concentration gradients during subsolidus re-equilibration." @default.
• W2889411657 created "2018-09-07" @default.
• W2889411657 creator A5041486616 @default.
• W2889411657 creator A5048798917 @default.
• W2889411657 date "2018-10-01" @default.
• W2889411657 modified "2023-10-14" @default.
• W2889411657 title "Preservation of systematic Ni and Cr heterogeneity in otherwise homogeneous mantle olivine: Implications for timescales of post-metasomatism re-equilibration" @default.
• W2889411657 cites W1964041624 @default.
• W2889411657 cites W1967216006 @default.
• W2889411657 cites W1968021533 @default.
• W2889411657 cites W1968839333 @default.
• W2889411657 cites W1969859799 @default.
• W2889411657 cites W1972770283 @default.
• W2889411657 cites W1974767465 @default.
• W2889411657 cites W1974796100 @default.
• W2889411657 cites W1977078092 @default.
• W2889411657 cites W1981678508 @default.
• W2889411657 cites W1985996409 @default.
• W2889411657 cites W1987320207 @default.
• W2889411657 cites W1988623878 @default.
• W2889411657 cites W1990775837 @default.
• W2889411657 cites W1993501967 @default.
• W2889411657 cites W2003070232 @default.
• W2889411657 cites W2006548751 @default.
• W2889411657 cites W2009065796 @default.
• W2889411657 cites W2012243673 @default.
• W2889411657 cites W2020411041 @default.
• W2889411657 cites W2020726550 @default.
• W2889411657 cites W2021832532 @default.
• W2889411657 cites W2025977604 @default.
• W2889411657 cites W2029693986 @default.
• W2889411657 cites W2034075926 @default.
• W2889411657 cites W2042731771 @default.
• W2889411657 cites W2044599228 @default.
• W2889411657 cites W2057136030 @default.
• W2889411657 cites W2065853327 @default.
• W2889411657 cites W2065918365 @default.
• W2889411657 cites W2066990311 @default.
• W2889411657 cites W2067402433 @default.
• W2889411657 cites W2071651314 @default.
• W2889411657 cites W2077698686 @default.
• W2889411657 cites W2079375907 @default.
• W2889411657 cites W2080908504 @default.
• W2889411657 cites W2094037622 @default.
• W2889411657 cites W2096956171 @default.
• W2889411657 cites W2103527049 @default.
• W2889411657 cites W2106058110 @default.
• W2889411657 cites W2109494156 @default.
• W2889411657 cites W2111407646 @default.
• W2889411657 cites W2125980428 @default.
• W2889411657 cites W2131761907 @default.
• W2889411657 cites W2133857316 @default.
• W2889411657 cites W2146383473 @default.
• W2889411657 cites W2149433543 @default.
• W2889411657 cites W2161423703 @default.
• W2889411657 cites W2161733805 @default.
• W2889411657 cites W2164197774 @default.
• W2889411657 cites W2165920301 @default.
• W2889411657 cites W2178718305 @default.
• W2889411657 cites W2181052355 @default.
• W2889411657 cites W2317888739 @default.
• W2889411657 cites W2734803488 @default.
• W2889411657 cites W2766796944 @default.
• W2889411657 cites W2789657261 @default.
• W2889411657 cites W2791335159 @default.
• W2889411657 cites W2800797345 @default.
• W2889411657 cites W4250970938 @default.
• W2889411657 doi "https://doi.org/10.1016/j.lithos.2018.08.026" @default.
• W2889411657 hasPublicationYear "2018" @default.
• W2889411657 type Work @default.
• W2889411657 sameAs 2889411657 @default.
• W2889411657 citedByCount "8" @default.
• W2889411657 countsByYear W28894116572020 @default.
• W2889411657 countsByYear W28894116572021 @default.
• W2889411657 countsByYear W28894116572022 @default.
• W2889411657 countsByYear W28894116572023 @default.
• W2889411657 crossrefType "journal-article" @default.
• W2889411657 hasAuthorship W2889411657A5041486616 @default.
• W2889411657 hasAuthorship W2889411657A5048798917 @default.
• W2889411657 hasBestOaLocation W28894116572 @default.
• W2889411657 hasConcept C127313418 @default.
• W2889411657 hasConcept C147717901 @default.
• W2889411657 hasConcept C151730666 @default.
• W2889411657 hasConcept C167919410 @default.
• W2889411657 hasConcept C17409809 @default.
• W2889411657 hasConcept C183282558 @default.
• W2889411657 hasConcept C199289684 @default.
• W2889411657 hasConcept C2778998827 @default.
• W2889411657 hasConcept C2780364934 @default.
• W2889411657 hasConcept C42796848 @default.
• W2889411657 hasConcept C67236022 @default.
• W2889411657 hasConcept C77928131 @default.
• W2889411657 hasConcept C84372278 @default.
• W2889411657 hasConceptScore W2889411657C127313418 @default.
• W2889411657 hasConceptScore W2889411657C147717901 @default.
• W2889411657 hasConceptScore W2889411657C151730666 @default.
• W2889411657 hasConceptScore W2889411657C167919410 @default.
• W2889411657 hasConceptScore W2889411657C17409809 @default.

• next