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- W2332994729 abstract "The Fernando de Noronha Archipelago presents, on its main island, a centrally-located stratigraphic unit, the Remedios Formation (age around 8 - 12 Ma) constituted by basal pyroclastic rocks intruded by dikes, plugs and domes of varied igneous rocks, capped by flows and pyroclastics of mafic to ultramafic rocks of the Quixaba Formation (age around 1 - 3 Ma), which is limited from the underlying unit by an extensive irregular erosion surface. A predominant sodic Remedios series (basanites, tephrites, tephri- phonolites, essexite, phonolites) can be separated from a moderately potassic Remedios sequence (alkali basalts, trachyandesites, tra- chytes), both alkaline series showing mostly continuous geochemi- cal trends in variation diagrams for major as well as trace elements, indicating evolution by crystal fractionation (mainly, separation of mafic minerals, including apatites and titanites). There are textur- al and mineralogical evidences pointing to hybrid origin of some intermediate rocks (e.g., resorbed pyroxene phenocrysts in basaltic trachyandesites, and in some lamprophyres). The primitive Quixaba rocks are mostly melanephelinites and basanites, primitive under- saturated sodic types. Geology (erosion surface), stratigraphy (two distinct units separated by a large time interval), petrography (varied Remedios Formation, more uniform Quixaba unit) and geochemis- try indicate that the islands represent the activity of a protracted vol- canic episode, fueled by intermittent melting of an enriched mantle, not related to asthenospheric plume activity." @default.
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- W2332994729 title "Geochemistry of the alkaline volcanic- subvolcanic rocks of the Fernando de Noronha Archipelago, southern Atlantic Ocean Geoquímica das rochas vulcânicas-subvulcânicas alcalinas do Arquipélago de Fernando de Noronha, Oceano Atlântico Meridional" @default.
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