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• W1523556076 abstract "Siluro-Devonian high-K calc-alkaline magmatism in the Grampian Terrane initiated at~430 Ma, just when subduction of oceanic lithosphere ceased. It followed subductionof the leading edge of continental Avalonia beneath the margin of Laurentia and itpersisted for 22-25 million years. Previous U-Pb zircon age data record the earliestplutonic crystallisation at ~429-428 Ma (Rogers and Dunning 1991). New highprecisionID-TIMS U-Pb dating of magmatic zircons yields 425.0 ± 0.7 Ma for theLorn Lava Pile, 422.5 ± 0.5 Ma for the Rannoch Moor Pluton, 419.4 ± 4.8 Ma for aFault-Intrusion at Glencoe caldera volcano, 418.0 ± 0.5 Ma for the Clach LeathadPluton, which cuts Glencoe, 415.0 ± 0.4 Ma for the Cruachan Intrusion of the EtivePluton and 408.1 ± 0.4 Ma for the Inner Starav Intrusion of the Etive Pluton. TheEtive Pluton was assembled in ~8 million years and together with the Clach Leathadand Rannoch plutons constitutes the Lochaber Batholith, which formed in 14 millionyears. The Etive Dyke Swarm was mostly formed within ~3-4 million years and waspart of the plumbing of a large volcano (Etive Volcano; ≥2000 km3) that was intrudedby the Etive Pluton and then almost entirely removed by uplift and erosion. The postcollisionmagmatism is described in terms of a magmatic flare-up that resulted frombreakoff of the subducted oceanic lithosphere and consequent rise of asthenosphere,which led to partial melting of LILE- and LREE-enriched lithospheric mantle andmafic-to-intermediate lowermost crust. Large volumes (1000s of km3) of andesiteand dacite were erupted repeatedly throughout the flare-up but were rapidly removedby contemporaneous uplift and erosion. This essential volcanic counterpart to the‘Newer Granite’ plutons has not previously been fully recognised; it is probable thatcentred volcanoes preceded the plutons widely, from Shetland to Donegal. Mostintermediate magmas formed by partial melting of mafic-to-intermediate lowermostcrust that derived its high Ba-Sr qualities via a previous partial melting of the LILEenrichedlithospheric mantle, possibly at ~1.8 Ga. This crustal recycling was causedby heat and volatile addition from underplated mantle melts (parental appinitelamprophyremagmas) and involved uplift related to the rise of asthenosphere throughthe slab break." @default.
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• W1523556076 date "2008-04-24" @default.
• W1523556076 modified "2023-09-27" @default.
• W1523556076 title "Timing, relations and cause of plutonic and volcanic activity of the Siluro-Devonian post-collision magmatic flare-up in the Grampian Terrane, Scotland [abstract]" @default.
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