SCHUBERT, G.. AND T. SPOHN(1981). Two-layer man- tle convection and the depletion of radioactives in the lower mantle. Geophys. Res. Lett. 8, 951-954.Schubert,G.,Spohn,T.Two layer mantle convection and the depletion of radioactive elements in the lower mantle. Geophysical Research ...
A large number of N-body simulations of the giant-impact phase of planet formation, combined with the measured concentrations of highly siderophile elements in Earth’s mantle, reveal that the Moon must have formed at least 40 million years after the con
Combined fractionation of MgSiO3 and CaSiO3 perovskites during an early magma ocean has been suggested as a means of enriching the lower mantle in silica. Our results show, however, that the chondritic upper mantle ratios of refractory lithophile elements would be lost after 17% of perovskite ...
Calculated MgO and FeO abundances in a mantle-melt system are used as an example of the modelling technique. Such modelling yields limited fields of permissible melts and residues for a given parent composition, but does not give the paths of melting. It does allow the temperature and extent ...
Rather than being created solely during supernova explosions, chemical elements could also be produced deep within the Earth’s lower mantle. It has long been theorized that hydrogen, helium, and lithium were the only chemical elements in existence during theBig Bangwhen the...
Is the Earth's crust denser than the mantle? What are rocks formed from molten material called? What does the lower mantle do? What material rises from cracks in the oceanic crust? Which layer forms the largest portion of Earth? Which layer of Earth has the highest density and temperature?
If the HSE abundances present in the upper mantle are representative of the entire mantle, then the upper end of the mass requirements (~0.4 to 0.8 % of the mass of Earth) must have been added to the Earth subsequent to the conclusion of substantial metal-silicate equilibration. This is ...
Investigations into the compositional model of the Earth, particularly the atypical concentrations of volatile elements within the silicate portion of the early Earth, have attracted significant interest due to their pivotal role in elucidating the plane
Ultramafic xenoliths from the Bearpaw Mountains, Montana, USA: Evidence for multiple metasomatic events in the lithospheric mantle beneath the Wyoming craton Ultramafic xenoliths in Eocene minettes of the Bearpaw Mountains volcanic field (Montana, USA), derived from the lower lithosphere of the Wyomi...
Chemical element abundances in the earth and it's major shells Chemical element abundances are estimated with respect to the Earth as a whole and it's major shells, i. e., the crust, upper and lower mantle and the core, according to present geophysical, geochemical, cosmochemical data and...