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Cited by 230High-pressure geophysics and materialsGeological and Geophysical StudiesGeological and Geochemical Analysis

Self‐consistent generation of tectonic plates in time‐dependent, three‐dimensional mantle convection simulations 2. Strain weakening and asthenosphere

Tackley, Paul J.·2000·Geochemistry, Geophysics, Geosystems
DOI 10.1029/2000gc000043
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Abstract

In a previous paper [ Tackley , 2000b] it was shown that a combination of temperature‐dependent viscosity and viscoplastic yielding is sufficient to give rudimentary plate tectonic‐like behavior in three‐dimensional models of mantle convection. Here the calculations are extended to include two complexities that have been suggested as being important in localizing deformation at plate boundaries: strain weakening and the presence of a low‐viscosity asthenosphere. Introducing an asthenosphere by reducing the viscosity by a factor of 10 where material reaches a solidus (1) dramatically improves plate quality, even if the asthenosphere is restricted to regions around spreading centers, (2) gives good, smoothly evolving platelike behavior over a wide range of yield stress values spanning an order of magnitude, and (3) gives bimodal stable solutions over a range of yield stresses; either immobile‐lid or plate behavior may be obtained, depending on initial condition. By contrast, introducing an asthenosphere by using depth‐dependent viscosity has a much smaller effect on system behavior. Increasing strain weakening (1) improves localization at spreading centers but leads to an increasingly complex network of spreading centers fragmenting the plates, (2) weakens convergent zones and can make downwellings highly episodic, and (3) does not lead to pure transform boundaries in these calculations. Time‐dependent “damage” evolution and instantaneous strain‐rate weakening give very similar…

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  • For the evolution of oceanic lithosphere, the difference between instantaneous rheology and history-dependent rheology is not expected to be vital.

    “For the evolution of oceanic lithosphere,51 therefore, the difference between instantaneous rheology and history-dependent rheology is52 not expected to be vital [Tackley, 2000].”

    From Scaling of plate-tectonic convection with pseudoplastic rheology (2010) · cites this paper as Tackley, 2000

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Authors
Tackley, P. J.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Tackley, Paul J.
ORCID
Tackley, Paul J.
Venue
Geochemistry, Geophysics, Geosystems
Publisher
American Geophysical Union (AGU)
Published
2000-08
Volume
1
Issue
8
ISSN
1525-2027 (ISSN-L)
DOI
10.1029/2000gc000043
OpenAlex
W1847281866
Cited by
229
References
82
Citations by year
2026: 3 · 2025: 4 · 2024: 8 · 2023: 8 · 2022: 6 · 2021: 5 · 2020: 10 · 2019: 12 · 2018: 4 · 2017: 7 · 2016: 11 · 2015: 17 · 2014: 13 · 2013: 13 · 2012: 7
FWCI
6.22
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 24 d)
Locations
Geochemistry Geophysics Geosystems (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
  • Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
plate tectonics, mantle convection, asthenosphere, strain weakening, temperature-dependent viscosity, solidus, yield stress, plate localization, spreading centers, downwelling, mantle heterogeneity, damage evolution

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