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Rapid formation of the Small Isles Tertiary centre constrained by precise Ar/Ar and U–Pb ages |
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| Authors: | LM Chambers MS Pringle RR Parrish |
| Institution: | aDepartment of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK bNERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK cScottish Universities Environmental Research Centre, Rankine Avenue, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK dDepartment of Geology, University of Leicester, University Road, Leicester, LE1 7RH, UK |
| Abstract: | The relative chronology of magmatic and tectonic events is key to an understanding of the influence of the Iceland plume on the North Atlantic. In particular, the location and duration of magmatism is of fundamental importance. Initial widespread flood basalt formation occurred in Baffin Island, Greenland, and Britain before complete plate break up at 56 Ma after which time magmatism became concentrated in the active rift zone. Historically the British Tertiary Igneous Province (BTIP) has been instrumental in advancing many concepts of igneous petrology. However, the absolute age and duration of the province remains unresolved. Here, we present new internally consistent 40Ar/39Ar ages that help to constrain the volcanic activity in the Small Isles centre to within 2 my. This short duration has implications for the onset of magmatism in the larger North Atlantic province, the rapid unroofing of the Rum volcano, and more significantly, some of the evidence used to propose pulsing of the Iceland plume. |
| Keywords: | 40Ar/39Ar U–Pb BTIP NAIP Iceland plume |
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