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Inferring Earth’s discontinuous chemical layering from the 660-kilometer boundary topography

2019; American Association for the Advancement of Science; Volume: 363; Issue: 6428 Linguagem: Inglês

10.1126/science.aav0822

1095-9203

Wenbo Wu, Sidao Ni, J. C. E. Irving,

earthquake and tectonic studies

Inferring blocked mantle convection The boundaries between rocks with different physical properties in Earth's interior come from either a change in crystal structure or a change in chemical composition. Wu et al. examined the roughness of the boundary between Earth's upper and lower mantle, thought to form from a change in mineral structure (see the Perspective by Houser). To their surprise, in some locations, the boundary has small-scale roughness that requires some chemical difference above and below the boundary. This observation provides evidence of partially blocked mantle circulation that leads to some chemical differences between the upper and lower mantle. Science , this issue p. 736 ; see also p. 696