The debate now focuses on hydrogen isotopes ... with oxygen more easily in colder areas. So, icy bodies that formed far from the Sun usually show higher D/H ratios. This makes the ratio a marker ...

Microbeam analysis of zircon U-Th-Pb isotope systematics and trace element compositions is a routine task in the ICPMS facility using the ThermoElectron X-Series II quadrupole ICPMS and New Wave ...