Hole et al. 2015 Gondwana break-up related magmatism in the Falkland Islands
Analytical Methods
All samples were crushed in an agate TEMA® mill to avoid the Ta, Nb and Co contamination reported for WC mills. Major and trace elements were analysed on 104 samples by XRF spectrometry at the Department of Geology and Petroleum Geology, University of Aberdeen following the method of Rice et al. (1995) and Hole et al. (2015). Major elements were analysed on fused glass discs and trace elements on pressed powder briquettes.  Nb was analyzed by XRF using similar protocols to those described by Fitton et al. (1998) except that additional calibrations were effected by using Nb2O5 spiked norite matrix, for the concentration ranges 0.5-20 ppm. The matrix was from the Belhelvie Intrusion, Aberdeenshire, and was selected on the basis of its similar major element composition to the analyzed samples. Data for International Reference Samples run during the period of analysis of the Falkland Islands samples are given in the supplementary data.  REE, Th, Ta, Hf, Co, and Sc were analyzed on selected samples by Instrumental Neutron Activation at the Depermant of Earth Science, Open University, UK.   In addition, REE, Th, U, Hf and Pb were analyzed in samples NMF41, NEF9, ECF13, ECF42 and ECF44 by ICP-MS at the Scottish Universities Enviromental Research Centre, East Kilbride.  Data for International Reference Sample BCR-1, which was analyzed at the same time as the Falkland Islands samples, are given in the supplementary tables.
Electron microprobe analyses were performed on a Cambridge Intruments Microscan 5 using a beam accelerating voltage of 15 kV, a current of 50 nA and a focused spot of approximately 2-5µm diameter. Raw counts were matrix corrected using Link Analytical ZAF-4/FLS software. All analyses were made using a carbon sample coating.
All isotopic determinations were carried out at the Scottish Universities Enviromental Research Centre, East Kilbride, using the same sample powder aliquots used for elemental analysis. In order to minimize the effects of alteration, all samples were leached in warm 6M HCl for two hours and rinsed thoroughly in distilled water prior to elemental separation. Rb and Sr were separated using cation exchange methods. Sm and Nd were separated from the bulk REE fraction from the cation exchange columns using two additional columns. Firstly Ba was separated from the REE using a column containing 0.25ml of Eicrhon SrSpec ion exchange resin and eluting with 3M HNO3; in this process Ba is retained on the column. Sm and Nd were then isolated using a temperature-controlled anion exchange column (Barbero et al. 1995).  Pb was separated using standard HBr-HCl anion exchange methods, with analytical blanks being <1 ng. Sr samples were run on a VG 54-30 thermal ionization mass spectrometer in dynamic mode. The 87Sr/86Sr ratio was corrected for mass fractionation using 86Sr/88Sr = 0.1194. Repeat analyses of NBS 987 Sr standard gave 87Sr/86Sr = 0.710219 ± 26 (2 s.d.).  Rb was analysed on a VG54E mass spectrometer. Nd isotope ratios were determined on the VG Sector 54-30 instrument in multi-dynamic mode with 143Nd/144Nd being corrected for mass fractionation using 146Nd/144Nd = 0.7219.  The JM standard gave 143Nd/144Nd =0.511500±10 (2 s.d.). Sm and Nd concentrations were determined on the same instrument in static mode. Pb was analysed on the VG 54E instrument. Data were corrected for mass fractionation of 0.15%/amu based on replicate analyses of the NBS981 standard. External reproducibility of the 206Pb/204Pb, 20Pb/204Pb and 208Pb/204Pb ratios is 0.2% (2 s.d.). 
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