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A geochemical study of conglomerate clasts from the Yukon-Koyukuk Basin and their tectonic origin
Charlotte Fredriksson (BSc student)

Yukon-Koyukuk Basin Conglomerate.

The geochemical analysis of mafic clasts in the basal Yukon-Koyukuk Basin conglomerate are used to i) determine the tectonic setting this material was derived from, and ii) test the sequence of uplift and erosion due to Brookian Orogenesis. Clasts compositions are bimodal and were derived from the Angayucham ophiolite (NMORB) and as yet unnamed island arc (OIA basalts). Furthermore, they document the erosion and burial of the Angayucham ophiolite, as clasts of this type decrease to the south.