Hf-W Chronometry of Lunar Metals and the Age and Early Differentiation of the Moon

  title={Hf-W Chronometry of Lunar Metals and the Age and Early Differentiation of the Moon},
  author={Thorsten Kleine and H. Palme and Klaus Mezger and Alex N. Halliday},
  pages={1671 - 1674}
The use of hafnium-tungsten chronometry to date the Moon is hampered by cosmogenic tungsten-182 production mainly by neutron capture of tantalum-181 at the lunar surface. We report tungsten isotope data for lunar metals, which contain no 181Ta-derived cosmogenic 182W. The data reveal differences in indigenous 182W/184W of lunar mantle reservoirs, indicating crystallization of the lunar magma ocean 4.527 ± 0.010 billion years ago. This age is consistent with the giant impact hypothesis and… 
Late formation and prolonged differentiation of the Moon inferred from W isotopes in lunar metals
The Moon is thought to have formed from debris ejected by a giant impact with the early ‘proto’-Earth and, as a result of the high energies involved, the Moon would have melted to form a magma ocean.
Tungsten isotopic evidence for disproportional late accretion to the Earth and Moon
Characterization of the hafnium–tungsten systematics of the lunar mantle will enable better constraints on the timescale and processes involved in the currently accepted giant-impact theory for the formation and evolution of the Moon, and for testing the late-accretion hypothesis.
Tungsten Isotopes in Planets.
Tungsten isotopic data for meteorites show that the parent bodies of some differentiated meteorites accreted within 1 million years after Solar System formation, demonstrating that traces of Earth's earliest formative period have been preserved throughout Earth's history.
A young Moon-forming giant impact at 70–110 million years accompanied by late-stage mixing, core formation and degassing of the Earth
  • A. Halliday
  • Geology
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2008
New W isotope data for lunar metals demonstrate that the Moon formed late in isotopic equilibrium with the bulk silicate Earth (BSE), and the Rb–Sr age of the Moon is defined, which is significantly later than had been deduced from W isotopes based on model assumptions or isotopic effects now known to be cosmogenic.
Early differentiation of meteorites constrained by the Hf-W isotope system
Isotopic studies of meteorites and sampies from the Moon, Mars, and the Earth combined with astranomical observations of planet forming regions from our Solar System and extrasolar systems pravide
Early differentiation of the Earth and the Moon
It is shown, based on new mass-balance calculations for Nd isotopes, that the presence of a hidden reservoir is difficult to reconcile with the combined 142Nd–143Nd systematics of the Earth's mantle.


Age and Origin of the Moon
The age and origin of the moon have been studied with the use of the recently developed short-lived hafnium-tungsten chronometer (182Hf-182W, half-life of nine million years). The tungsten isotopic
On the age of KREEP
INVITED REVIEW. Magmatic evolution of the Moon
Abstract Although incomplete because of the imperfect and somewhat random sampling of rock types by the Apollo and Luna missions (1969-1976), the history of lunar magmatism has been reconstructed by