Dislocation interactions in olivine control postseismic creep of the upper mantle

Wallis, David; Hansen, Lars N.; Wilkinson, Angus J.; Lebensohn, Ricardo A.

doi:10.1038/s41467-021-23633-8

Dislocation interactions in olivine control postseismic creep of the upper mantle

Journal Article · Wed Jun 09 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-23633-8· OSTI ID:1804398

^[1]; Hansen, Lars N. ^[2]; ^[3]; ^[4]

Utrecht Univ. (The Netherlands)
Univ. of Minnesota-Twin Cities, Minneapolis, MN (United States)
Univ. of Oxford (United Kingdom)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Changes in stress applied to mantle rocks, such as those imposed by earthquakes, commonly induce a period of transient creep, which is often modelled based on stress transfer among slip systems due to grain interactions. However, recent experiments have demonstrated that the accumulation of stresses among dislocations is the dominant cause of strain hardening in olivine at temperatures ≤600 °C, raising the question of whether the same process contributes to transient creep at higher temperatures. Here, we demonstrate that olivine samples deformed at 25 °C or 1150–1250 °C both preserve stress heterogeneities of ~1 GPa that are imparted by dislocations and have correlation lengths of ~1 μm. The similar stress distributions formed at these different temperatures indicate that accumulation of stresses among dislocations also provides a contribution to transient creep at high temperatures. The results motivate a new generation of models that capture these intragranular processes and may refine predictions of evolving mantle viscosity over the earthquake cycle.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: LDRD

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1804398

Alternate ID(s):: OSTI ID: 1828041

Report Number(s):: LA-UR--20-24462

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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