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Bimodal zircon ages from Natash volcanics (southeast Egypt) and the link between eruption mechanisms and Late Cretaceous tectonics ArchiMer
Abu El-rus, Mohamed Ali; Paquette, Jean-louis; Chazot, Gilles; Vannucci, Riccardo.
Trachyte plugs from the Natash volcanic field have been precisely dated using in situ U-Pb geochronology on zircon grains at similar to 93Ma. Available zircon ages thus suggest that the overall volcanic history at Natash was probably shorter than previously estimated based on Rb-Sr and K-Ar ages, which are more sensitive to element mobility. Basaltic flows and trachyte plugs were produced by a largely synchronous, Upper Cretaceous volcanic activity that occurred in the Natash area at the onset of the extensional fracturing that preceded and accompanied the doming of the Afro-Arabian Shield. Extraction and eruption of volumetrically dominant basalts from deeper lithospheric levels were ruled by major NW-SE strike-slip faults, whereas both major and...
Tipo: Text Palavras-chave: Eastern Desert Egypt; Cretaceous volcanism; Natash volcanics; Trachyte plugs; U-Pb zircon ages.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00637/74936/75943.pdf
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