The onset of plate tectonics on super-Earth’s using a damage rheology
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| Дата: | 2010 |
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| Мова: | English |
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Назва видання: | Геофизический журнал |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/101316 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | The onset of plate tectonics on super-Earth’s using a damage rheology / B. Foley, D. Bercovici, W. Landuyt // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 48. — Бібліогр.: 2 назв. — англ. |
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The onset of plate tectonics on super-Earth’s
using a damage rheology
B. Foley1, D. Bercovici1, W. Landuyt2, 2010
1Yale University Department of Geology and Geophysics, New Haven CT, USA
bradford.foley@yale.edu
david.bercovici@yale.edu
2University of California San Diego, Scripps Institute of Oceanography, San Diego CA, USA
wlanduyt@ucsd.edu
Numerical simulations of mantle convection with
a damage — grainsize feedback are used to deve-
lop scaling laws to predict conditions at which su-
per-Earths would have plate tectonics. In particular,
we introduce a new criterion for the onset of plate
tectonics on terrestrial planets: that the viscosity of
the lithosphere must be reduced to some critical
value, which we assume to be the mantle viscosity.
We formulate this criterion using the viscosity ratio
between the pristine lithosphere and underlying
mantle ( 0/ 1). These conditions are mapped out in
regime diagrams of 0/ 1 versus the damage frac-
tion (fa). The regime diagrams show that the transi-
tion from stagnant lid to mobile surface occurs for
higher 0/ 1 as fa increases, with a power law rela-
tionship between those two variables; moreover,
decreasing the healing constant (ka) at the surface
shifts the transition boundary to higher 0/ 1. A sca-
ling law is developed assuming that the transition
between regimes occurs when damage, driven by
convective stresses, reduces the viscosity in the
lithosphere to a viscosity comparable to the mantle
viscosity. This scaling law explains the numerical
results well and can be applied to terrestrial pla-
nets. For the Earth, damage is efficient in the litho-
sphere, and viscosity can be reduced by 10 orders
of magnitude with grains being reduced to a size on
the order of a micron. When applied to super-Earth’s,
we find that larger planets are capable of larger vis-
cosity reductions, but the viscosity ratio increases
with planetary size at roughly the same rate. There-
fore, contrary to previous results [e. g. O’Neill,
Lenardic, 2007; Valencia et al., 2007], we find that
the size of the planet has little effect on the convec-
tive regime that planet lies in. Factors such as sur-
face temperature and thermal evolution may be more
important in explaining the convective style of ter-
restrial planets.
References
O’Neill C., Lenardic A. Geological Consequences of
Super-sized Earths // Geophys. Res. Lett. — 2007.
— 34. — P. 19204—19208.
Valencia D., O’Connell R. J., Sasselov D. D. Inevi-
tability of Plate Tectonics on Super-Earths // Astro-
phys. J. — 2007. — 670, �))1. — P. L45—L48.
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irk-123456789-1013162016-06-03T03:02:02Z The onset of plate tectonics on super-Earth’s using a damage rheology Foley, B. Bercovici, D. Landuyt, W. 2010 Article The onset of plate tectonics on super-Earth’s using a damage rheology / B. Foley, D. Bercovici, W. Landuyt // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 48. — Бібліогр.: 2 назв. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/101316 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| format |
Article |
| author |
Foley, B. Bercovici, D. Landuyt, W. |
| spellingShingle |
Foley, B. Bercovici, D. Landuyt, W. The onset of plate tectonics on super-Earth’s using a damage rheology Геофизический журнал |
| author_facet |
Foley, B. Bercovici, D. Landuyt, W. |
| author_sort |
Foley, B. |
| title |
The onset of plate tectonics on super-Earth’s using a damage rheology |
| title_short |
The onset of plate tectonics on super-Earth’s using a damage rheology |
| title_full |
The onset of plate tectonics on super-Earth’s using a damage rheology |
| title_fullStr |
The onset of plate tectonics on super-Earth’s using a damage rheology |
| title_full_unstemmed |
The onset of plate tectonics on super-Earth’s using a damage rheology |
| title_sort |
onset of plate tectonics on super-earth’s using a damage rheology |
| publisher |
Інститут геофізики ім. С.I. Субботіна НАН України |
| publishDate |
2010 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/101316 |
| citation_txt |
The onset of plate tectonics on super-Earth’s using a damage rheology / B. Foley, D. Bercovici, W. Landuyt // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 48. — Бібліогр.: 2 назв. — англ. |
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Геофизический журнал |
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