Skip to content

Research at St Andrews

A fluvial origin for the Neoproterozoic Morar Group, NW Scotland; implications for Torridon-Morar Group correlation and the Grenville Orogen foreland basin

Research output: Contribution to journalArticle

Author(s)

Maarten Krabbendam, Tony Prave, David Cheer

School/Research organisations

Abstract

Precambrian sedimentary successions are difficult to date and correlate. In the Scottish Highlands, potential correlations between the thick, undeformed siliciclastic 'Torridonian' successions in the foreland of the Caledonian Orogen and the highly deformed and metamorphosed siliciclastic Moine succession within the Caledonian Orogen have long intrigued geologists. New and detailed mapping of the Neoproterozoic Altnaharra Formation (Morar Group, lowest Moine Supergroup) in Sutherland has discovered low-strain zones exhibiting well-preserved sedimentary features. The formation comprises 3-5 km of coarse, thick-bedded psammite with abundant nested trough and planar cross-bedding bedforms, defining metre-scale channels. Palaeocurrent directions are broadly unimodal to the NNE-ENE. We interpret the Altnaharra Formation as high-energy, braided fluvial deposits. The Altnaharra Formation and the unmetamorphosed, Neoproterozoic Applecross-Aultbea formations (Torridon Group) are similar in terms of lithology, stratigraphical thickness, sedimentology, geochemistry, detrital zircon ages and stratigraphical position on Archaean basement. Depositional age constraints for both successions overlap and are coeval with late Grenvillean orogenic activity. Detrital zircons imply similar source regions from the Grenville Orogen. The Morar and Torridon groups can thus be correlated across the Caledonian Moine Thrust and are best explained as parts of a single, large-scale, orogen-parallel foreland basin to the Grenville Orogen.

Close

Details

Original languageEnglish
Pages (from-to)379-394
Number of pages16
JournalJournal of the Geological Society
Volume165
StatePublished - Jan 2008

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. 1.99 Ga mafic magmatism in the Rona terrane of the Lewisian Gneiss Complex in Scotland

    Baker, T. R., Prave, A. R. & Spencer, C. J. 28 Dec 2018 In : Precambrian Research. In press

    Research output: Contribution to journalArticle

  2. Evolution of the Mozambique Belt in Malawi constrained by granitoid U-Pb, Sm-Nd and Lu-Hf isotopic data

    Manda, B. W. C., Cawood, P. A., Spencer, C. J., Prave, T., Robinson, R. & Roberts, N. M. W. 29 Nov 2018 In : Gondwana Research. In press

    Research output: Contribution to journalArticle

  3. Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia

    Paiste, K., Lepland, A., Zerkle, A. L., Kirsimäe, K., Izon, G. J., Patel, N., McLean, F., Kreitsmann, T., Mänd, K., Bui, T., Romashkin, A., Rychanchik, D. & Prave, A. R. 5 Nov 2018 In : Chemical Geology. 499, p. 151-164 14 p.

    Research output: Contribution to journalArticle

  4. Crustal reworking and orogenic styles inferred from zircon Hf isotopes: Proterozoic examples from the North Atlantic region

    Spencer, C. J., Kirkland, C. L., Prave, A. R., Strachan, R. A. & Pease, V. 19 Oct 2018 In : Geoscience Frontiers. In press

    Research output: Contribution to journalArticle

  5. Two-billion-year-old evaporites capture Earth's great oxidation

    Blättler, C., Claire, M., Prave, A. R., Zerkle, A. L. & Warke, M. R. 22 Mar 2018 In : Science. eaar2687

    Research output: Contribution to journalArticle

Related by journal

  1. Journal of the Geological Society (Journal)

    G Ian Alsop (Editor)
    2004 → …

    Activity: Publication peer-review and editorial workEditor of research journal

Related by journal

  1. Petroleum generation and migration in the Cambro-Ordovician Laurentian margin succession of NW Scotland

    Parnell, J., Bowden, S. & Mark, D. Jan 2018 In : Journal of the Geological Society. 175, 1, p. 33-43 11 p.

    Research output: Contribution to journalArticle

  2. Quantitative dating of pleistocene deposits of the Kyrenia range, Northern Cyprus: implications for timing, rates of uplift and driving mechanisms

    Palamakumbura, R. N., Robertson, A. H. F., Kinnaird, T. C., van Calsteren, P., Kroon, D. & Tait, J. A. 1 Nov 2016 In : Journal of the Geological Society. 173, 6, p. 933-948 16 p.

    Research output: Contribution to journalArticle

  3. The Palaeoproterozoic global carbon cycle: insights from the Loch Maree Group, NW Scotland

    Kerr, G. B., Prave, A. R., Martin, A. P., Fallick, A. E., Brasier, A. T. & Park, R. G. Jan 2016 In : Journal of the Geological Society. 173, 1, p. 170-176 7 p.

    Research output: Contribution to journalArticle

  4. Distinguishing diapirs from inflated plutons: an integrated rock magnetic fabric and structural study on the Roundstone Pluton, western Ireland

    McCarthy, W., Petronis, M. S., Reavy, R. J. & Stevenson, C. T. Sep 2015 In : Journal of the Geological Society. 172, 5, p. 550-565 16 p.

    Research output: Contribution to journalArticle

ID: 23333840