PerspectiveGeophysics

Deep Diamond Mysteries

See allHide authors and affiliations

Science  03 Aug 2001:
Vol. 293, Issue 5531, pp. 813-814
DOI: 10.1126/science.1063295

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Summary

The boundary at 660 km that separates the mantle transition zone from the lower mantle has been a focus of controversy, in particular regarding the question whether convection involves the whole mantle or is layered with a boundary at 660 km. In her Perspective, McCammon explains how tiny inclusions in diamonds from the top of the lower mantle are helping to resolve these controversies. The deep diamonds favor a hybrid model where limited mixing occurs between the upper and lower mantle, but chemical inhomogeneities are preserved.