[1] Nat Hist Museum Vienna, A-1010 Vienna, Austria
[2] Lund Univ, Dept Geol, Lund, Sweden
[3] Univ Toulouse, GET, Toulouse, France
[4] UHFB, UFR STRM, Abidjan, Cote Ivoire
[5] Curtin Univ, Sch Earth & Planetary Sci, Space Sci & Technol Ctr, Perth, WA, Australia
[6] Vatican Observ, V-00120 Vatican City, Vatican
[7] Univ Brasilia, Lab Geochronol & Isotope Geochem, Brasilia, DF, Brazil
[8] Univ Freiburg, Inst Earth & Environm Sci, Freiburg, Germany
[9] Univ Vienna, Dept Lithospher Res, A-1090 Vienna, Austria
[10] Univ Western Ontario, Dept Earth Sci, London, ON, Canada
[11] Scottish Univ Environm Res Ctr, NERC Argon Isotope Facil, E Kilbride G75 0QF, Lanark, Scotland