Abstract:
:The classical strength profile of continents is derived from a quasi-static view of their rheological response to stress--one that does not consider dynamic interactions between brittle and ductile layers. Such interactions result in complexities of failure in the brittle-ductile transition and the need to couple energy to understand strain localization. Here we investigate continental deformation by solving the fully coupled energy, momentum and continuum equations. We show that this approach produces unexpected feedback processes, leading to a significantly weaker dynamic strength evolution. In our model, stress localization focused on the brittle-ductile transition leads to the spontaneous development of mid-crustal detachment faults immediately above the strongest crustal layer. We also find that an additional decoupling layer forms between the lower crust and mantle. Our results explain the development of decoupling layers that are observed to accommodate hundreds of kilometres of horizontal motions during continental deformation.
journal_name
Naturejournal_title
Natureauthors
Regenauer-Lieb K,Weinberg RF,Rosenbaum Gdoi
10.1038/nature04868subject
Has Abstractpub_date
2006-07-06 00:00:00pages
67-70issue
7098eissn
0028-0836issn
1476-4687pii
nature04868journal_volume
442pub_type
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