[1] Polish Acad Sci, Inst Geol Sci, Twarda 51-55, PL-00818 Warsaw, Poland
[2] Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland
[3] German Res Ctr Geosci GFZ, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany
[4] Scottish Univ Environm Res Ctr, Isotope Geosci Unit, E Kilbride G75 0QF, Lanark, Scotland