Thin-section detrital zircon geochronology mitigates bias in provenance investigations

Detrital zircon U-Pb geochronology has enabled advances in the understanding of sediment provenance, transportation pathways, and depositional age sedimentary packages. However, sample selection processing can result biasing detrital spectra. This paper presents a novel approach using in-situ measurements on thin-sections to provide greater confidence maximum ages provenance interpretations. New data 310 grains from 16 Triassic Mungaroo Formation two wells Northern Carnarvon Basin, Australia, are presented. Whilst modes consistent with previous work, there some differences relative proportions modes, which is partly attributed lack small hand-picked grain mounts. The bias quantified via size comparison dated (in or mounts) all zircons identified bulk-mounts thin-sections. youngest mode (∼320 – 195 Ma) an active margin north, likely South West Borneo and/or Lhasa terrane. reveal 197 Ma for upper part Formation, suggesting deposition continued into Early Jurassic. Supplementary material: https://doi.org/10.6084/m9.figshare.c.5628911