Journal Highlights

Strengthening the hypothesis of a diffusion creep Earth

Editor’s Highlight—

 

This research field has suffered from bimodal views for the last 40 years. On the one hand there was dislocation creep, inducing crystallographic preferred orientation (CPO), and seismic anisotropy; on the other hand was diffusion creep, no CPO, and no seismic anisotropy. This study presents statistical analyses of the rotation and sliding observed in very fine-grained aggregates of pure forsterite+ diopside, deformed at high temperature and room pressure in a creep apparatus. The first paper presents the data while the second details the rotation angles for both forsterite and diopside, for rotation occurring ‘in-plane’ and ‘out-of-plane’. The results suggest that diffusion creep can lead to CPO if the grain size is small. This represents a significant revision of our knowledge in mineral physics and strengthen the hypothesis of a diffusion creep Earth.