Chronology of crustal growth and recycling in the Paleoproterozoic Amisk collage (Flin Flon Belt), Trans-Hudson Orogen, Canada

U-Pb zircon ages have been compiled for magmatic and sedimentary rocks from the low metamorphic grade portion of the Flin Flon greenstone belt, now re cognized as a Paleoproterozoic tectonic collage. The "Amisk collage" formed in two major magmatic periods that were separated by an interval of intrao ceanic accretionary tectonics. Pre-accretionary volcanic and plutonic rocks of arc and ocean-floor tectonic affinities have crystallization ages of 1. 906-1.901 and 1.888-1.881 Ga; the earlier period was dominated by juvenile tholeiitic arc basalts and related back-arc-basin basalts, and the younger period by juvenile calc-alkaline volcanic rocks and turbidites. Intraoceani c accretion of the diverse tectono-stratigraphic assemblages may have comme nced between 1.90 and 1.89 Ga, but the main period was 1.88-1.87 Ga. The po st-accretionary period (1.876-1.838 Ga) was characterized by intrusion of j uvenile calk-alkaline plutons generated by a successor arc that stitched th e diverse pre-accretionary assemblages. Marine to subaerial volcaniclastic and epiclastic units were deposited in successor basins less than or equal to 1.87 Ga (Schist-Wekusko suite), succeeded by alluvial-fluvial (Missi Gro up) to marine (Burntwood Group) sediments after 1.85 Ga. Despite the domina nce of juvenile magmatic rocks within the collage, U-Pb zircon age and Nd-i sotopic data show that older (> 2.2-3.0 Ga) basement fragments were present throughout the development of the Amisk collage. An arc-back-arc system cl ose to an Archean craton is proposed as the most likely tectonic setting du ring formation and accretion of the Amisk collage from 1.90 to 1.84 Ga. Sub sequent continental collision during peak orogeny (1.84-1.81 Ga) is interpr eted to have delaminated the lower crust and upper mantle of the collage, p referentially preserving crust of intermediate bulk composition.