Skip to content

Evidence from the U-Pb-Hf signatures of detrital zircons for a Baltican provenance for basal Old Red Sandstone successions, northern Scottish Caledonides

Research output: Contribution to journalArticlepeer-review

The provenance of Devonian Old Red Sandstone (ORS) continental successions in the northern Scottish Caledonides is poorly known: were they derived locally or from more distal sources? The integration of U-Pb and Hf isotope analyses in detrital zircon crystals reduces potential ambiguities arising from non-unique age populations and yields information on the crustal evolution of source terranes. Samples of basal ORS successions yield zircon U-Pb age groupings of c. 1800–1500 and c. 1200–900 Ma, with minor Neoarchaean, Tonian, Ediacaran and Ordovician contributions. SW Baltica provides the best match for detrital zircon ages and Hf isotopic signatures, and much of the >900 Ma zircon population was probably recycled from Neoproterozoic successions. εHf(t) values in c. 1800–1000 Ma grains reflect the assembly of Nuna, development of a long-lived retreating subduction system along its margin, and Grenville collisional orogenesis. These basal ORS successions were likely deposited within the same regional fluvial system as coeval sedimentary rocks in the Midland Valley, draining an area of positive relief in SW Baltica where continental convergence continued through the Early Devonian.
Original languageEnglish
JournalJournal of the Geological Society
Early online date16 Feb 2021
DOIs
Publication statusEarly online - 16 Feb 2021

Documents

  • Evidence from the U-Pb_Hf signatures

    Rights statement: Rob A. Strachan, Hugo K. H. Olierook and Christopher L. Kirkland, 'Evidence from the U-Pb-Hf signatures of detrital zircons for a Baltican provenance for basal Old Red Sandstone successions, northern Scottish Caledonides,' Journal of the Geological Society, Ahead of print, https://doi.org/10.1144/jgs2020-241.

    Accepted author manuscript (Post-print), 1.65 MB, PDF document

    Due to publisher’s copyright restrictions, this document is not freely available to download from this website until: 16/02/22

Relations Get citation (various referencing formats)

ID: 26345051