none 10.1144/jgs2020-241 Geological Society of London Geological Society of London 1881 124185653 44798 2024111903345000455 10.1144 2024-11-19T09:27:54Z 2021-02-16T07:00:57Z 14 Journal of the Geological Society JGS 0016-7649 2041-479X 06 17 2021 07 2021 178 4 Rob A. Strachan School of the Environment, Geography and Geosciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK Timescales of Mineral Systems Group, Centre for Exploration Targeting – Curtin Node, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia https://orcid.org/0000-0002-9568-0832 Hugo K. H. Olierook Timescales of Mineral Systems Group, Centre for Exploration Targeting – Curtin Node, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia John de Laeter Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia https://orcid.org/0000-0001-5961-4304 Christopher L. Kirkland Timescales of Mineral Systems Group, Centre for Exploration Targeting – Curtin Node, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia John de Laeter Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia https://orcid.org/0000-0003-3367-8961 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 the source terranes. Samples of basal ORS successions yield zircon U–Pb age groupings of c. 1800–1500 and c. 1200–900 Ma, with minor Neoarchean, 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. ε Hf ( t ) values in c. 1800–1000 Ma grains reflect the assembly of Nuna, the development of a long-lived retreating subduction system along its margin and Grenville collisional orogenesis. These basal ORS successions were probably 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. Supplementary material : Isotopic data, statistical comparison of selected samples and TIMA heavy mineral data are available at https://doi.org/10.6084/m9.figshare.c.5301780 03 17 2021 07 2021 jgs2020-241 10.1144/jgs2020-241 1 10.1144/crossmark-policy www.lyellcollection.org true 2020-12-08 2021-02-08 2021-02-11 2021-03-17 https://doi.org/10.15223/policy-002 10.1144/jgs2020-241 https://www.lyellcollection.org/doi/10.1144/jgs2020-241 https://www.lyellcollection.org/doi/pdf/10.1144/jgs2020-241 https://geoscienceworld.org/jgs/article-lookup?doi=10.1144/jgs2020-241 10.1144/SP335.12 Alsop G.I. Cheer D. Strachan R.A. Krabbendam M. Kinny P.D. Holdsworth R.E. and Leslie A.G. 2010. Progressive fold and fabric evolution associated with regional strain gradients: a case study from across a Scandian ductile thrust nappe Scottish Caledonides. 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