A Review of the Lunar 182Hf-182W Isotope System Research

In recent years, the extinct nuclide 182Hf-182W system has been developed as an essential tool to date and trace lunar origin evolution. Despite a series of achievements, controversies problems exist. As review, this paper details application principles isotope summarizes research development on W isotopes Moon. A significant radiogenic ε182W excess 0.24 ± 0.01 was found in mantle, leading heated debates. There are three main explanations for excess, including (1) radioactive origin; (2) mantle Moon-forming impactor; (3) disproportional late accretion Earth Debates these have revealed different views age. The reported ages Moon mainly divided into two views: early (30–70 Ma after solar formation); (>70 formation). This discusses possible effects 182W composition, impactor, veneer, Oceanus Procellarum-forming projectile. Finally, unexpected isotopic similarities between discussed.