文档介绍：Earth and Planetary Science Letters 539 (2020) 116243
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Earth and Planetary Science Letters
Using thermo-mechanical models of subduction to constrain effective
mantle viscosity
∗
Fanny Garel a, , Catherine Thoraval a, Andréa Tommasi a, Sylvie Demouchy a,
D. Rhodri Davies b
a Géosciences Montpellier, Univ. Montpellier, CNRS, Montpellier, France
b Research School of Earth Sciences, The Australian National University, Canberra, Australia
a r t i c l e i n f o a b s t r a c t
Article history: Mantle convection and plate dynamics transfer and deform solid material on scales of hundreds to
Received 3 July 2019 thousands of km. However, viscoplastic deformation of rocks arises from motions of defects at sub-
Received in revised form 16 March 2020 crystal scale, such as vacancies or dislocations. In this study, results from numerical experiments
Accepted 20 March 2020
of dislocation dynamics in olivine for temperatures and stresses relevant for both lithospheric and
Available online 14 April 2020
asthenospheric mantle (800–1700 K and 50–500 MPa; Gouriet et al., 2019) are used to derive
Editor: R. Bendick
three sigmoid parameterizations (erf, tanh, algebraic), which express stress evolution as a function of
Keywords: temperature and strain rate. The three parameterizations fit well the results of dislocation dynamics
olivin