SHRIMP measurements of U and Pb isotopes in the Koongarra secondary ore deposit, Northern Australia

1Research Group for Terrestrial Environment, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan 2Division of Global Environmental Science and Engineering, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan 3Research School of Earth Sciences, The Australian National University, GPO Box 4 Canberra, ACT 2601, Australia 4Environment Division, Australian Nuclear Science & Technology Organisation, PMB 1, Menai, NSW 2234, Australia 5Department of Environmental Science, Graduate School of Science and Technology, Kumamoto University, Kurokami, Kumamoto 860-8555, Japan