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https://zone.biblio.laurentian.ca/handle/10219/3163
Titre: | Sedimentology, stratigraphy, and U-Pb detrital-zircon geochronology of the Meall Dearg Formation, Stoer Group, Torridonian succession, north-western Scotland |
Auteurs: | Lebeau, Lorraine Elizabeth |
Mots clés: | mesoproterozoic;Stoer Group;Torridonian;rift basin;palaeoclimate;U-Pb detritalzircon geochronology;Lewisian Gneiss Complex;fluvial-aeolian |
Date publié: | 12-sep-2018 |
Abstrait: | The Meall Dearg Formation is a c.1.2 billion year old sandstone, and represents the uppermost unit of the Stoer Group (Torridonian succession, north-western Scotland). Originally described as purely fluvial, the Meall Dearg Formation is here reappraised to represent coeval fluvial-channelised, floodbasin, and aeolian erg environments by facies analysis and petrographic methods. Evidence from palaeoclimate indicators points to humid conditions at time of deposition — inferred from clastic rather than evaporitic floodbasin strata. U-Pb detrital-zircon geochronology resolved provenance from the underlying Lewisian Gneiss Complex (comprising several juxtaposed terranes). Erosion from the Assynt, Gruinard, and Gairloch terranes provided most sediment supply. A statistical comparison of ages from the fluvial and aeolian deposits revealed that both underwent sediment transfer and/or were supplied from comparable terranes. The Meall Dearg Formation, a post-rift fill, is largely comparable to the coeval, pre-Rodinian Gardar-Rift sequence of Greenland. |
URI: | https://zone.biblio.laurentian.ca/handle/10219/3163 |
Apparaît dans les collections: | Earth Sciences / Sciences de la Terre - Master's Theses Master's Theses |
Fichiers dans cet item:
Fichier | Description | Taille | Format | |
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Lorraine Lebeau's final thesis September 17th.pdf | 60.85 MB | Adobe PDF | Parcourir/Ouvrir |
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