Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle
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| Datum: | 2010 |
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| Format: | Artikel |
| Sprache: | English |
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Schriftenreihe: | Геофизический журнал |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/103526 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle / D. Yuen, N. Tosi, O. Cadek // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 206. — англ. |
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Important influences of depth-dependent
lower-mantle properties on the formation
of a plume-fed asthenosphere
in the upper mantle
D. Yuen1, N. Tosi2, O. Cadek3, 2010
1Department of Geology and Geophysics, University of Minnesota, Minneapolis, USA
daveyuen@gmail.com
2German Space Agency, Berlin, Germany
3Charles University, Prague, Czech Republic
Asthenosphere is an old geological concept
based on uncanny intuition of Reginald Daly in the
1920's. to explain surface geological observations
with underlying mobility in mind.
The idea of a plume-fed asthenosphere has been
around for a few years due to the ideas of Phipps-
Morgan and his father Jason Morgan. Basiclly this
calls for a dynamically induced mechanism instead
of partial melting or a mineralogical phase change.
Using a two-dimensional Cartesian code based on
finite-volume method, we have investigated the in-
fluences of lower mantle physical properties on the
formation of a low viscosity zone in the upper mantle
in regions close to a large mantle upwelling. The
rheological law is Newtonian and has both tempera-
ture- and pressure-dependences. An extended
Boussinesq model is assumed for the energetics
and both the spinel to perovskite and perovskite to
post-perovskite phase transitions are considered.
We have compared the differences in the behavior
of hot upwellings passing through the transition zone
in the mid-mantle for a variety of models, starting
with constant physical properties in the lower-mantle
and culminating with complex models which have
the post-perovskite phase transitions and depth-
dependent properties of both the thermal expansion
coefficient and the thermal conductivity.
We found that the formation of the asthenosphere
in the upper mantle in the vicinity of large upwell-
ings is only possible in models where both depth-
dependent thermal expansivity and thermal conduc-
tivity are included. The constant thermal expansivity
and costant thermal conductivity models fail to de-
liver a hot low viscous zone, resembling the astheno-
sphere. Our findings argue for the potentially impor-
tant role played by lower-mantle material properties
on the development of plume-fed asthenosphere in
the oceanic upper-mantle.
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| spelling |
irk-123456789-1035262016-06-20T03:01:11Z Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle Yuen, D. Tosi, N. Cadek, O. 2010 Article Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle / D. Yuen, N. Tosi, O. Cadek // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 206. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/103526 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 |
Yuen, D. Tosi, N. Cadek, O. |
| spellingShingle |
Yuen, D. Tosi, N. Cadek, O. Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle Геофизический журнал |
| author_facet |
Yuen, D. Tosi, N. Cadek, O. |
| author_sort |
Yuen, D. |
| title |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| title_short |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| title_full |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| title_fullStr |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| title_full_unstemmed |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| title_sort |
important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle |
| publisher |
Інститут геофізики ім. С.I. Субботіна НАН України |
| publishDate |
2010 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/103526 |
| citation_txt |
Important influences of depth-dependent lower-mantle properties on the formation of a plume-fed asthenosphere in the upper mantle / D. Yuen, N. Tosi, O. Cadek // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 206. — англ. |
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Геофизический журнал |
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2025-07-07T13:58:25Z |
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