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| Titel |
Towards modelling the evolution of intra plate stress: the Eurasian plate 20 Ma. |
| VerfasserIn |
Sandrine Quéré, Karin Ruckstuhl, Rinus Wortel, Rob Govers, Cyril Hochard, Gerard Stampfli |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042897
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| Zusammenfassung |
| In this study, we investige the evolution of the intra plate stress field. We use the classical
characterisation of forces acting regionally on a plate such as ‘slab pull/suction’, ‘ridge push’
and ‘mantle drag’ as used by Forsyth & Uyeda (1975), Chapple & Tullis (1977) and
later by Wortel et al. (1991) and Govers & Meijer (2001). So far, the interaction
between the lithosphere and the underlying mantle flow was oversimplified and
implemented via a coupling cœfficient in the direction of the plate motion and we propose
improving this specific interaction. As the shear stress field at the base of the plates
is unknown in the past, we propose using a mantle flow simulation induced by
the imposition of past plate motions on top of a 3D spherical mantle convective
code. To that purpose, we employ the new plate motion reconstruction developed
by Stampfli et al. (2008) and a 3D convective code where plates are dynamically
coupled to the mantle (Quéré & Forte, 2006). The first plate on which we apply this
method is the Eurasian plate as Eurasia is a large plate with a small velocity (not
attached to its own subduction zone) and the debate on the main driving forces
acting on Eurasia is still going on. The stress field 20 Ma resulting from all plate
tectonic forces is calculated by assuming mechanical equilibrium in an homogeneous
elastic shell using the plane stress approximation. As direct stress indicators for the
past are rare, the predicted paleo-stress field is compared to pertinent data from
orogens and extensional basins which will provide new clues to oil exploration teams. |
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