The oxygen isotope composition of earth's oldest rocks and evidence of a terrestrial magma ocean

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

D. Rumble, S. Bowring, T. Iizuka, T. Komiya, A. Lepland, Minik Thorleif Rosing, Y. Ueno

Analysis of Hadean and Archean rocks for O-16-O-17-O-18 isotopes demonstrates that the Terrestrial Mass Fractionation Line of oxygen isotopes has had the same slope and intercept for at least the past 4.0 and probably for as long as 4.2Ga. The homogenization of oxygen isotopes required to produce such long-lived consistency was most easily established by mixing in a terrestrial magma ocean. The measured identical oxygen isotope mass fractionation lines for Earth and Moon suggest that oxygen isotope reservoirs of both bodies were homogenized at the same time during a giant moon-forming impact. But other sources of heat for global melting cannot be excluded such as bolide impacts during early accretion of proto-Earth, the decay of short-lived radioactive isotopes, or the energy released during segregation of core from mantle.
OriginalsprogEngelsk
TidsskriftGeochemistry, Geophysics, Geosystems
Vol/bind14
Udgave nummer6
Sider (fra-til)1929-1939
Antal sider11
ISSN1525-2027
DOI
StatusUdgivet - jun. 2013

    Forskningsområder

  • oxygen isotopes, magma ocean

ID: 119833880