ERI Summer Fellowship Report : Nicoletta Christina Browne
نویسنده
چکیده
Over summer 2017, I continued my research on dikes emplaced during the waning stages of the Neoproterozoic-Ordovician Ross Orogen, a continental arc along the present day location of the Transantarctic Mountains in Antarctica. The dikes intrude calc-alkaline plutons constituting the main intrusive phase as well as metasedimentary rocks formed during early stages of orogenesis. These dikes comprise a bimodal suite of mafic and felsic rocks that have previously been interpreted to be the result of regional extension postdating subduction; they represent the youngest intrusive rocks in the sequence and essentially mark the end of the Ross Orogeny. Previous workers have interpreted the mafic dikes as lamprophyres, unusual mafic dikes characterized simultaneously by enrichment in Mg and other features hinting a mantle origin and enrichment in volatiles and incompatible elements that is not normally observed in mantle-derived rocks. Overall, my research focused on three primary objectives:
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