Matches in SemOpenAlex for { <https://semopenalex.org/work/W6498613> ?p ?o ?g. }
Showing items 1 to 89 of
89
with 100 items per page.
- W6498613 abstract "Western Aleutian seafloor lavas define a highly calc-alkaline series, with Mg numbers (Mg#, Mg/Mg+Fe) greater than 0.65 in dacitic lavas with 2-4% MgO at 63-70% SiO2. These lavas have uniformly radiogenic Hf and Nd and variable, but relatively unradiogenic, Sr and Pb, at the MORB-like end of the spectrum of island-arc lavas. Andesites and dacites have high Sr >1000 ppm, fractionated trace element patterns (Sr/Y=50-350, La/Yb=8-35, Dy/Yb=2-3.5), and low relative abundances of Nb and Ta (La/Ta=100-300), consistent with an enhanced role for residual or cumulate garnet + rutile. MORB-like isotope compositions and high MgO and Mg# relative to silica, rule out an origin for the andesites and dacites by fractional crystallization from basalt, except perhaps, by a process of melt-rock reaction with peridotite. The most fractionated trace element patterns are in western seafloor rhyodacites (69-70% SiO2), which were dredged from volcanic cones built on Bering Sea oceanic lithosphere, where the crust is probably no more than 10 km thick, and so unlikely to produce garnet during crustal melting. We interpret the western seafloor andesites and dacites to have been produced by melting of subducted MORB-like basalt in the eclogite facies, followed by interaction of the resulting high-silica melt with mantle peridotite. This interpretation is consistent with the tectonic setting in the western Aleutians, which is dominated by oblique convergence, capable of producing a relatively hot subducting plate. Western seafloor lavas define an end-member composition with MORB-like isotope compositions and fractionated trace element ratios, which falls at the end of the continuum of compositions for all Aleutian lavas. The end-member character of western seafloor lavas is clearest in plots highlighting their radiogenic Hf, Nd and strong relative depletions in Ta and Yb. The western seafloor lavas also define an end-member composition for Pb isotopes Some western seafloor samples have high Nd/Hf, as required by Hf-Nd mixing scenarios, which indicate that a source component with radiogenic Hf and Nd and Nd/Hf greater than ~8, is present in lavas throughout the Aleutian arc (Brown et al., 2005 Fall AGU). Abundances of radiogenic Nd and Hf in the eclogite-melt component are relatively high, and so offset the unradiogenic Hf and Nd from subducted sediment. The result is a source mixture with much higher contributions of both subducted basalt and subducted sediment relative to the mantle end-member, than is produced when these elements are modeled as binary mixtures of mantle and sediment." @default.
- W6498613 created "2016-06-24" @default.
- W6498613 creator A5000794501 @default.
- W6498613 creator A5021053411 @default.
- W6498613 creator A5032279664 @default.
- W6498613 creator A5044712309 @default.
- W6498613 creator A5070546467 @default.
- W6498613 creator A5086409817 @default.
- W6498613 date "2013-01-01" @default.
- W6498613 modified "2023-09-27" @default.
- W6498613 title "Role of Subducted Basalt in the Genesis Island Arc Magmas: Evidence from Western Aleutian Seafloor Lavas" @default.
- W6498613 hasPublicationYear "2013" @default.
- W6498613 type Work @default.
- W6498613 sameAs 6498613 @default.
- W6498613 citedByCount "0" @default.
- W6498613 crossrefType "journal-article" @default.
- W6498613 hasAuthorship W6498613A5000794501 @default.
- W6498613 hasAuthorship W6498613A5021053411 @default.
- W6498613 hasAuthorship W6498613A5032279664 @default.
- W6498613 hasAuthorship W6498613A5044712309 @default.
- W6498613 hasAuthorship W6498613A5070546467 @default.
- W6498613 hasAuthorship W6498613A5086409817 @default.
- W6498613 hasConcept C117485682 @default.
- W6498613 hasConcept C11872896 @default.
- W6498613 hasConcept C120806208 @default.
- W6498613 hasConcept C127313418 @default.
- W6498613 hasConcept C151730666 @default.
- W6498613 hasConcept C154200439 @default.
- W6498613 hasConcept C154489570 @default.
- W6498613 hasConcept C161509811 @default.
- W6498613 hasConcept C165205528 @default.
- W6498613 hasConcept C17409809 @default.
- W6498613 hasConcept C192241223 @default.
- W6498613 hasConcept C193944797 @default.
- W6498613 hasConcept C2779321686 @default.
- W6498613 hasConcept C36986328 @default.
- W6498613 hasConcept C58097730 @default.
- W6498613 hasConcept C5900021 @default.
- W6498613 hasConcept C77928131 @default.
- W6498613 hasConcept C79572550 @default.
- W6498613 hasConcept C83948199 @default.
- W6498613 hasConcept C84372278 @default.
- W6498613 hasConceptScore W6498613C117485682 @default.
- W6498613 hasConceptScore W6498613C11872896 @default.
- W6498613 hasConceptScore W6498613C120806208 @default.
- W6498613 hasConceptScore W6498613C127313418 @default.
- W6498613 hasConceptScore W6498613C151730666 @default.
- W6498613 hasConceptScore W6498613C154200439 @default.
- W6498613 hasConceptScore W6498613C154489570 @default.
- W6498613 hasConceptScore W6498613C161509811 @default.
- W6498613 hasConceptScore W6498613C165205528 @default.
- W6498613 hasConceptScore W6498613C17409809 @default.
- W6498613 hasConceptScore W6498613C192241223 @default.
- W6498613 hasConceptScore W6498613C193944797 @default.
- W6498613 hasConceptScore W6498613C2779321686 @default.
- W6498613 hasConceptScore W6498613C36986328 @default.
- W6498613 hasConceptScore W6498613C58097730 @default.
- W6498613 hasConceptScore W6498613C5900021 @default.
- W6498613 hasConceptScore W6498613C77928131 @default.
- W6498613 hasConceptScore W6498613C79572550 @default.
- W6498613 hasConceptScore W6498613C83948199 @default.
- W6498613 hasConceptScore W6498613C84372278 @default.
- W6498613 hasLocation W64986131 @default.
- W6498613 hasOpenAccess W6498613 @default.
- W6498613 hasPrimaryLocation W64986131 @default.
- W6498613 hasRelatedWork W1967171398 @default.
- W6498613 hasRelatedWork W2022665116 @default.
- W6498613 hasRelatedWork W2027293310 @default.
- W6498613 hasRelatedWork W2029497855 @default.
- W6498613 hasRelatedWork W2039538655 @default.
- W6498613 hasRelatedWork W2055718208 @default.
- W6498613 hasRelatedWork W2057550910 @default.
- W6498613 hasRelatedWork W2072145983 @default.
- W6498613 hasRelatedWork W2093038182 @default.
- W6498613 hasRelatedWork W2096229571 @default.
- W6498613 hasRelatedWork W2104306959 @default.
- W6498613 hasRelatedWork W2104609449 @default.
- W6498613 hasRelatedWork W2105197534 @default.
- W6498613 hasRelatedWork W2168310234 @default.
- W6498613 hasRelatedWork W2278589569 @default.
- W6498613 hasRelatedWork W2519663901 @default.
- W6498613 hasRelatedWork W2754881414 @default.
- W6498613 hasRelatedWork W2901414570 @default.
- W6498613 hasRelatedWork W3029529721 @default.
- W6498613 hasRelatedWork W3193176456 @default.
- W6498613 isParatext "false" @default.
- W6498613 isRetracted "false" @default.
- W6498613 magId "6498613" @default.
- W6498613 workType "article" @default.