Leveraging detrital zircon geochemistry to study deep arc processes: REE-rich magmas mobilized by Jurassic rifting of the Sierra Nevada arc

•Geochemically anomalous arc-derived detrital zircon are Middle-Late Jurassic in age.•Jurassic rifting mobilized deep magmas that typically do not reach the upper crust.•Most REE-rich zircon record magmatic differentiation prior to hornblende saturation.•Some REE-rich zircon record resorption of hornblende during depressurization.•Niobium and scandium contents are useful fractionation and assimilation indices.