arXiv:0907.4104v1 [astro-ph.EP] 23 Jul 2009 The Earth-Moon system during the Late Heavy Bombardment period – geochemical support for impacts dominated by comets. Uffe Gr˚ ae Jørgensen 1,* , Peter W.U. Appel 2 , Yuichi Hatsukawa 3 , Robert Frei 4 , Ma- sumi Oshima 3 , Yosuke Toh 3 , Atsushi Kimura 3 1 Niels Bohr Institute and Centre for Star and Planet Formation, Juliane Maries Vej 30, 2100 Copen- hagen, Denmark, * Corresponding author email address: uffegj@nbi.dk 2 Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen, Denmark, 3 Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan, 4 Institute of Geography and Geology, and Nordic Center for Earth Evolution, Øster Voldgade 10, 1350 Copenhagen, Denmark. 1