New model shows Earth's deep mantle was drier from the start wustl PNASNews
But, sticking with candy comparisons, maybe think more about malt balls and not gooey caramels. A study from Washington University in St. Louis suggests that the deep part of the ancient
closest to the Earth's core started out substantially drier than the part of the mantle closest to the young planet's surface.and planetary sciences in Arts & Sciences, determined that the ancient plume mantle had a water concentration that was a factor of 4 to 250 times lower when compared with the water concentration of the upper mantle.
The resulting viscosity contrast could have prevented mixing within the mantle, helping to explain certain long standing mysteries about Earth's formation and evolution. The research is published the week of July 11 in the"A primordial viscosity contrast may explain why the giant impacts that triggered whole-mantle magma oceans did not homogenize the growing planet," said Parai, who is a faculty fellow of the university's McDonnell Center for the Space Sciences.
Parai's investigation challenges an assumption that was once widely held in her field: that Earth's mantle was uniform from the start. When the
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