语境共现(KWIC)

, and deepening of the magma ocean as Earth grew. Mantle noble gas isotopic compositions and the mantle ab

w. Mantle noble gas isotopic compositions and the mantle abundance of elements that partition into the cor

le differentiation appears to have been erased by mantle convection within ?1.5 billion years of Earth for

atures similar to those of the present Earth, and mantle melting, and perhaps plate subduction, was produ

Earth differentiation may still exist in the deep mantle and continue to influence patterns of large-scale

and continue to influence patterns of large-scale mantle convection, sequestration of some trace elements,

e for plant-dinosaur coevolutionary interactions. Mantle minerals at shallow depths contain iron in the hi

as early as the 1960s, and minerals in the lower mantle were suggested to contain iron in the low-spin st

d experiments and calculations prove that iron in mantle minerals transforms from high-spin to low-spin at

ls transforms from high-spin to low-spin at lower-mantle pressures. This transition has important conseque

dynamics and thermochemical state of the lower mantle, through combined effects on density, elasticity,

the physics and chemistry in Earth's lower(most) mantle. Virtually all biotic, dark abiotic, and photoche

subduction channel dewatering into the overlying mantle wedge or as the metasomatic replacement by such

ost lower crust is less dense than the underlying mantle, but mafic lowermost crust could be unstable and

me eclogites and may continue to descend into the mantle, whereas more silica-rich rocks are transformed i