[1] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England
[2] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia
[3] ANSTO, Australian Synchrotron Res Program, Menai, NSW 2334, Australia
[4] Photon Factory, KEK, Australian Natl Beamline Facil, Tsukuba, Ibaraki 3050801, Japan