Matches in SemOpenAlex for { <https://semopenalex.org/work/W2022897365> ?p ?o ?g. }
- W2022897365 endingPage "75" @default.
- W2022897365 startingPage "57" @default.
- W2022897365 abstract "Platinum-group elements (Os, Ir, Ru, Rh, Pt, Pd) and gold contents have been determined along with S and modal sulfide abundances in 15 well-characterized spinel peridotite xenoliths from the Sidamo area (Gregory Rift, Ethiopia). In this xenolith suite, a group of deformed peridotites (refractory lherzolites to harzburgites) has been metasomatized by volatile-rich small melt-fractions while a group of granular peridotites (harzburgites to cpx-rich, fertile lherzolites) indicate extensive re-equilibration with high fractions of OIB-like melts at the bottom of the sub-continental lithosphere. The PGE data can be explained by a model combining a recent porous flow melt percolation event at variable melt–rock ratios superimposed on a protolith variably depleted by an old partial melting event. All PGE spectra have sub-chondritic Pt/Ir and Pt/Ru, decreasing with decreasing bulk-rock Al2O3 contents, and thus inherited from the partial melting event; likewise, whether deformed or granular, all the harzburgites have PGE and S abundances characteristic of residues from high degree partial melting, i.e. almost no base metal sulfides (especially Mss) and Pd- and Au-depleted CI-normalized PGE patterns. The two textural groups of lherzolites display contrasting PGE abundances and sulfide modal compositions, both reflecting the differing recent magmatic histories of the two groups. In the deformed lherzolites, Pd and Au abundances increase relative to Pt and Ir in parallel with the amount of Al-poor metasomatic diopside and intergranular Cu–Ni-rich sulfides, also of indisputable metasomatic origin. For this textural group, transport and precipitation of S, Cu, Pd and Au from the volatile-rich small-melt fraction is likely. Despite their fertile bulk-rock compositions (up to 3.65 wt.% Al2O3 contents) and evidence of metasomatic Fe–Ni-rich sulfides precipitated along with cpx, the granular lherzolites show surprisingly low total PGE contents (11.9–13.3 ppb) as well as sub-chondritic Pd/Ir ratios. Such a PGE budget can be explained by extensive re-equilibration between the OIB-like melts and Mss of residual origin, coupled with a mobility of sulfide melts in high-porosity zones of the lithospheric mantle. Our data indicate that porous flow melt percolation events may significantly alter the PGE budget of the sub-continental lithospheric mantle with respect to PUM estimates." @default.
- W2022897365 created "2016-06-24" @default.
- W2022897365 creator A5066484590 @default.
- W2022897365 creator A5075256092 @default.
- W2022897365 creator A5087050250 @default.
- W2022897365 date "2003-05-01" @default.
- W2022897365 modified "2023-10-13" @default.
- W2022897365 title "Platinum-group elements and melt percolation processes in Sidamo spinel peridotite xenoliths, Ethiopia, East African Rift" @default.
- W2022897365 cites W1481344554 @default.
- W2022897365 cites W1509335520 @default.
- W2022897365 cites W1968409651 @default.
- W2022897365 cites W1968554206 @default.
- W2022897365 cites W1969859799 @default.
- W2022897365 cites W1973500887 @default.
- W2022897365 cites W1974285180 @default.
- W2022897365 cites W1977457396 @default.
- W2022897365 cites W2004789205 @default.
- W2022897365 cites W2006288429 @default.
- W2022897365 cites W2007220738 @default.
- W2022897365 cites W2008297722 @default.
- W2022897365 cites W2011176927 @default.
- W2022897365 cites W2011190845 @default.
- W2022897365 cites W2014360993 @default.
- W2022897365 cites W2014406426 @default.
- W2022897365 cites W2015258641 @default.
- W2022897365 cites W2017732839 @default.
- W2022897365 cites W2018518478 @default.
- W2022897365 cites W2018591088 @default.
- W2022897365 cites W2019339918 @default.
- W2022897365 cites W2021869346 @default.
- W2022897365 cites W2026357419 @default.
- W2022897365 cites W2039326681 @default.
- W2022897365 cites W2043072330 @default.
- W2022897365 cites W2044893245 @default.
- W2022897365 cites W2054898297 @default.
- W2022897365 cites W2056670083 @default.
- W2022897365 cites W2056979881 @default.
- W2022897365 cites W2064067585 @default.
- W2022897365 cites W2072844742 @default.
- W2022897365 cites W2074062071 @default.
- W2022897365 cites W2077212053 @default.
- W2022897365 cites W2077433914 @default.
- W2022897365 cites W2082073912 @default.
- W2022897365 cites W2088516428 @default.
- W2022897365 cites W2097756509 @default.
- W2022897365 cites W2102148551 @default.
- W2022897365 cites W2109221183 @default.
- W2022897365 cites W2139639432 @default.
- W2022897365 cites W2139696801 @default.
- W2022897365 cites W2148342629 @default.
- W2022897365 cites W2149156044 @default.
- W2022897365 cites W2149217788 @default.
- W2022897365 cites W2152915196 @default.
- W2022897365 cites W2170859064 @default.
- W2022897365 doi "https://doi.org/10.1016/s0009-2541(02)00407-2" @default.
- W2022897365 hasPublicationYear "2003" @default.
- W2022897365 type Work @default.
- W2022897365 sameAs 2022897365 @default.
- W2022897365 citedByCount "93" @default.
- W2022897365 countsByYear W20228973652012 @default.
- W2022897365 countsByYear W20228973652013 @default.
- W2022897365 countsByYear W20228973652014 @default.
- W2022897365 countsByYear W20228973652015 @default.
- W2022897365 countsByYear W20228973652016 @default.
- W2022897365 countsByYear W20228973652017 @default.
- W2022897365 countsByYear W20228973652018 @default.
- W2022897365 countsByYear W20228973652019 @default.
- W2022897365 countsByYear W20228973652020 @default.
- W2022897365 countsByYear W20228973652021 @default.
- W2022897365 countsByYear W20228973652022 @default.
- W2022897365 crossrefType "journal-article" @default.
- W2022897365 hasAuthorship W2022897365A5066484590 @default.
- W2022897365 hasAuthorship W2022897365A5075256092 @default.
- W2022897365 hasAuthorship W2022897365A5087050250 @default.
- W2022897365 hasConcept C112764850 @default.
- W2022897365 hasConcept C127313418 @default.
- W2022897365 hasConcept C13495919 @default.
- W2022897365 hasConcept C151730666 @default.
- W2022897365 hasConcept C161790260 @default.
- W2022897365 hasConcept C167919410 @default.
- W2022897365 hasConcept C16942324 @default.
- W2022897365 hasConcept C17409809 @default.
- W2022897365 hasConcept C185592680 @default.
- W2022897365 hasConcept C2777018398 @default.
- W2022897365 hasConcept C2781251403 @default.
- W2022897365 hasConcept C42796848 @default.
- W2022897365 hasConcept C518104683 @default.
- W2022897365 hasConcept C55493867 @default.
- W2022897365 hasConcept C67236022 @default.
- W2022897365 hasConcept C77928131 @default.
- W2022897365 hasConcept C79572550 @default.
- W2022897365 hasConcept C84372278 @default.
- W2022897365 hasConcept C95628711 @default.
- W2022897365 hasConceptScore W2022897365C112764850 @default.
- W2022897365 hasConceptScore W2022897365C127313418 @default.
- W2022897365 hasConceptScore W2022897365C13495919 @default.
- W2022897365 hasConceptScore W2022897365C151730666 @default.
- W2022897365 hasConceptScore W2022897365C161790260 @default.