Matches in SemOpenAlex for { <https://semopenalex.org/work/W27973190> ?p ?o ?g. }
Showing items 1 to 77 of
77
with 100 items per page.
- W27973190 abstract "A layered bimodal sequence (LBS) was recently recognized in the Canyondomain in the central Grenville Province, and inferred to be the extrusive products of riftrelatedmagmatism at ~1.25 Ga. The LBS consists of alternating felsic and mafic rockswith, locally, pre-metamorphic hydrothermally altered zones (HAZ), and weremetamorphosed to mid-P granulite-facies conditions during the Grenvillian orogeny (~1Ga). In the HAZ, characteristic felsic rocks are pink and white gneisses, grading intovarieties of aluminous gneisses and garnetites. This thesis is a petrographic andgeochemical study of these rocks, and provides new insights on the protoliths, thehydrothermal alteration, and the subsequent metamorphic overprint.The most informative microstructures were observed in the aluminous gneisses, asfor instance: (a) relics of bipyramidal quartz phenocrysts indicative of a volcanicprecursor; (b) aluminous nodules, seams of sillimanite, and concordant quartz veinsrepresenting relict former pathways of hydrothermal fluid; and (c) quartz-K-feldsparplagioclase-garnet-sillimanite-biotite mineral assemblages with textural evidence ofpartial melting, and consistent with a mid-P granulite-facies metamorphic overprint. Inaddition, slightly elevated contents of Mn in garnet, Zn in spinel, and Ba in biotite and Kfeldsparin some rocks are consistent with hydrothermal fluid activity.Geochemical data placed the following constraints on the protoliths: (a) in termsof immobile elements, the chemical protoliths are characterized as rhyolite/dacite tobasalt/andesite, and most likely formed in an arc to rifted arc setting; (b) alteration indices(>50) and evidence in most rocks showing K-metasomatism and Na-depletion attest tohydrothermal alteration; and (c) the overall increase in contents of Al, K (with the exception of the garnetites), immobile and trace elements suggests seafloor alteration,most common to VMS environments." @default.
- W27973190 created "2016-06-24" @default.
- W27973190 creator A5044250016 @default.
- W27973190 date "2014-05-01" @default.
- W27973190 modified "2023-09-27" @default.
- W27973190 title "Petrography and geochemistry of hydrothermally altered volcanic rocks metamorphosed at granulite-facies conditions: an example from the central Grenville province" @default.
- W27973190 hasPublicationYear "2014" @default.
- W27973190 type Work @default.
- W27973190 sameAs 27973190 @default.
- W27973190 citedByCount "0" @default.
- W27973190 crossrefType "dissertation" @default.
- W27973190 hasAuthorship W27973190A5044250016 @default.
- W27973190 hasConcept C109007969 @default.
- W27973190 hasConcept C112764850 @default.
- W27973190 hasConcept C114793014 @default.
- W27973190 hasConcept C120806208 @default.
- W27973190 hasConcept C127313418 @default.
- W27973190 hasConcept C146588470 @default.
- W27973190 hasConcept C151730666 @default.
- W27973190 hasConcept C167284885 @default.
- W27973190 hasConcept C171701179 @default.
- W27973190 hasConcept C17409809 @default.
- W27973190 hasConcept C18142444 @default.
- W27973190 hasConcept C192241223 @default.
- W27973190 hasConcept C193429443 @default.
- W27973190 hasConcept C202539814 @default.
- W27973190 hasConcept C26687426 @default.
- W27973190 hasConcept C2777229588 @default.
- W27973190 hasConcept C2779870107 @default.
- W27973190 hasConcept C5900021 @default.
- W27973190 hasConcept C95628711 @default.
- W27973190 hasConceptScore W27973190C109007969 @default.
- W27973190 hasConceptScore W27973190C112764850 @default.
- W27973190 hasConceptScore W27973190C114793014 @default.
- W27973190 hasConceptScore W27973190C120806208 @default.
- W27973190 hasConceptScore W27973190C127313418 @default.
- W27973190 hasConceptScore W27973190C146588470 @default.
- W27973190 hasConceptScore W27973190C151730666 @default.
- W27973190 hasConceptScore W27973190C167284885 @default.
- W27973190 hasConceptScore W27973190C171701179 @default.
- W27973190 hasConceptScore W27973190C17409809 @default.
- W27973190 hasConceptScore W27973190C18142444 @default.
- W27973190 hasConceptScore W27973190C192241223 @default.
- W27973190 hasConceptScore W27973190C193429443 @default.
- W27973190 hasConceptScore W27973190C202539814 @default.
- W27973190 hasConceptScore W27973190C26687426 @default.
- W27973190 hasConceptScore W27973190C2777229588 @default.
- W27973190 hasConceptScore W27973190C2779870107 @default.
- W27973190 hasConceptScore W27973190C5900021 @default.
- W27973190 hasConceptScore W27973190C95628711 @default.
- W27973190 hasLocation W279731901 @default.
- W27973190 hasOpenAccess W27973190 @default.
- W27973190 hasPrimaryLocation W279731901 @default.
- W27973190 hasRelatedWork W1510796938 @default.
- W27973190 hasRelatedWork W1732284005 @default.
- W27973190 hasRelatedWork W2031629244 @default.
- W27973190 hasRelatedWork W2032031349 @default.
- W27973190 hasRelatedWork W2042043581 @default.
- W27973190 hasRelatedWork W2052807791 @default.
- W27973190 hasRelatedWork W2080309788 @default.
- W27973190 hasRelatedWork W2081233182 @default.
- W27973190 hasRelatedWork W2085420385 @default.
- W27973190 hasRelatedWork W2108973835 @default.
- W27973190 hasRelatedWork W2154345564 @default.
- W27973190 hasRelatedWork W2164031340 @default.
- W27973190 hasRelatedWork W2170057067 @default.
- W27973190 hasRelatedWork W2325935320 @default.
- W27973190 hasRelatedWork W2976206775 @default.
- W27973190 hasRelatedWork W3006183276 @default.
- W27973190 hasRelatedWork W3111071412 @default.
- W27973190 hasRelatedWork W80915352 @default.
- W27973190 hasRelatedWork W904431396 @default.
- W27973190 hasRelatedWork W130375001 @default.
- W27973190 isParatext "false" @default.
- W27973190 isRetracted "false" @default.
- W27973190 magId "27973190" @default.
- W27973190 workType "dissertation" @default.