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Timing, relations and cause of plutonic and volcanic activity of the Siluro-Devonian post-collision magmatic episode in the Grampian Terrane, Scotland

J.C. Neilson, B.P. Kokelaar and Q.G. Crowley
Journal of the Geological Society, 166, 545-561, 7 May 2009, https://doi.org/10.1144/0016-76492008-069
J.C. Neilson
1 Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3BX, UK
2 Present address: Dana Petroleum plc, 17 Carden Place, Aberdeen AB10 1UR, UK
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B.P. Kokelaar
1 Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3BX, UK
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Q.G. Crowley
3 NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK
4 Present address: School of Natural Sciences, Department of Geology, Trinity College, Dublin 2, Ireland
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Abstract:

Calc-alkaline magmatism in the Grampian Terrane started at c. 430 Ma, after subduction of the edge of continental Avalonia beneath Laurentia, and it then persisted for at least 22 Ma. Isotope dilution thermal ionization mass spectrometry U–Pb zircon dating yields 425.0 ± 0.7 Ma for the Lorn Lava Pile, 422.5 ± 0.5 Ma for Rannoch Moor Pluton, 419.6 ± 5.4 Ma for a fault-intrusion at Glencoe volcano, 417.9 ± 0.9 Ma for Clach Leathad Pluton in Glencoe, and, in the Etive Pluton, 414.9 ± 0.7 Ma for the Cruachan Intrusion and 408.0 ± 0.5 Ma for the Inner Starav Intrusion. The Etive Dyke Swarm was mostly emplaced during 418–414 Ma, forming part of the plumbing of a large volcano (≥2000 km3) that became intruded by the Etive Pluton and was subsequently removed by erosion. During the magmatism large volumes (thousands of km3) of high Ba–Sr andesite and dacite were erupted repeatedly, but were mostly removed by contemporaneous uplift and erosion. This volcanic counterpart to the ’Newer Granite' plutons has not previously been fully recognized. The intermediate magmas forming both plutons and volcanoes originated mainly by partial melting of heterogeneous mafic to intermediate lowermost crust that had high Ba–Sr derived from previous melting of large ion lithophile element (LILE)-enriched mantle, possibly at c. 1.8 Ga. This crustal recycling was induced by heat and volatiles from underplated small-degree melts of LILE- and light REE-enriched lithospheric mantle (appinite–lamprophyre magmas). The post-collision magmatism and uplift resulted from breakoff of subducted oceanic lithosphere and consequent rise of asthenosphere.

Supplementary material: Geochronological methods, tabulated data and additional figures are available at http://www.geolsoc.org.uk/SUP18343.

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Journal of the Geological Society: 166 (3)
Journal of the Geological Society
Volume 166, Issue 3
May 2009
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Timing, relations and cause of plutonic and volcanic activity of the Siluro-Devonian post-collision magmatic episode in the Grampian Terrane, Scotland

J.C. Neilson, B.P. Kokelaar and Q.G. Crowley
Journal of the Geological Society, 166, 545-561, 7 May 2009, https://doi.org/10.1144/0016-76492008-069
J.C. Neilson
1 Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3BX, UK
2 Present address: Dana Petroleum plc, 17 Carden Place, Aberdeen AB10 1UR, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
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B.P. Kokelaar
1 Department of Earth and Ocean Sciences, University of Liverpool, Liverpool L69 3BX, UK
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  • Search for this author on this site
Q.G. Crowley
3 NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK
4 Present address: School of Natural Sciences, Department of Geology, Trinity College, Dublin 2, Ireland
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Timing, relations and cause of plutonic and volcanic activity of the Siluro-Devonian post-collision magmatic episode in the Grampian Terrane, Scotland

J.C. Neilson, B.P. Kokelaar and Q.G. Crowley
Journal of the Geological Society, 166, 545-561, 7 May 2009, https://doi.org/10.1144/0016-76492008-069
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  • Article
    • Abstract:
    • Temporal constraints on the cause of the magmatism
    • U–Pb zircon dating
    • Nature and timing of appinite–lamprophyre magmatism
    • Etive Dyke Swarm and associated Etive Volcano
    • Geochemistry
    • Petrogenesis in the new time-frame
    • Discussion
    • Acknowledgments
    • References
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