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• W3127950044 abstract "Abstract The Loch Bà ring-dyke and the associated Centre 3 granites represent the main events of the final phase of activity at the Palaeogene Mull igneous complex. The Loch Bà ring-dyke is one of the best exposed ring-intrusions in the world and records intense interaction between rhyolitic and basaltic magma. To reconstruct the evolutionary history of the Centre 3 magmas, we present new major- and trace-element, and new Sr isotope data as well as the first Nd and Pb isotope data for the felsic and mafic components of the Loch Bà intrusion and associated Centre 3 granites. We also report new Sr, Nd and Pb isotope data for the various crustal compositions from the region, including Moine and Dalradian metasedimentary rocks, Lewisian gneiss, and Iona Group metasediments. Isotope data for the Loch Bà rhyolite ( 87 Sr/ 86 Sr i = 0.716) imply a considerable contribution of local Moine-type metasedimentary crust ( 87 Sr/ 86 Sr = 0.717–0.736), whereas Loch Bà mafic inclusions ( 87 Sr/ 86 Sr i = 0.704–0.707) are closer to established mantle values, implying that felsic melts of dominantly crustal origin mixed with newly arriving basalt. The Centre 3 microgranites ( 87 Sr/ 86 Sr i = 0.709–0.716 ) , are less intensely affected by crustal assimilation relative to the Loch Bá rhyolite. Pb-isotope data confirm incorporation of Moine metasediments within the Centre 3 granites. Remarkably, the combined Sr–Nd–Pb data indicate that Centre 3 magmas record no detectable interaction with underlying deep Lewisian gneiss basement, in contrast to Centre 1 and 2 lithologies. This implies that Centre 3 magmas ascended through previously depleted or insulated feeding channels into upper-crustal reservoirs where they resided within and interacted with fertile Moine-type upper crust prior to eruption or final emplacement." @default.
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• W3127950044 date "2021-02-01" @default.
• W3127950044 modified "2023-09-26" @default.
• W3127950044 title "Petrogenesis of the Loch Bà ring-dyke and Centre 3 granites, Isle of Mull, Scotland" @default.
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• W3127950044 doi "https://doi.org/10.1007/s00410-020-01763-4" @default.
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