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| Titel |
Models of orogeny in Tibet and Pamir |
| VerfasserIn |
Stephan Sobolev, Jens Tympel |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250057773
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| Zusammenfassung |
| Despite of significant achievements in modeling of the orogeny in Tibet, clearly lacking are
the models employing realistic composition and rheology of the lithosphere without
kinematically predefined motion of mantle. In order to fill this gap at least partially and in
search for an appropriate model setup and optimal technique for further modeling in the
framework of the TIPAGE project, we have performed a number of numerical tests focusing
at the following questions:
What should be the structure of lithosphere of greater India to fulfill new
paleomagnetic data suggesting about 1500 km of shortening of India during
50-55 Mln years of collision, together with seismic images suggesting less than
1000 km of understrusted Indian lithosphere beneath Asia?
Which view on timing of Tibet uplift is more plausible from modeling
perspective, view that Tibet was uplifted during the last 20 Mln years due to
delamination of mantle lithosphere, or more recent idea of early (>40 Mln years
old) high plateau expanding to the North and South?
What is the reason of strong heating and partial melting of the crust of Tibet and
Pamir and why domes are more common in Pamir than in Tibet?
What is the force that is required to drive orogeny in Tibet?
We perform a 2D thermomechanical modeling using two different numerical techniques based on
explicit (LAPEX) and implicit (SLIM) integration algorithms. In both methods we use same
visco-elasto-plastic temperature- and stress-dependant rheological models, constrained by
published laboratory data.
Modeling suggests that about 500-700 km of outer part of Greater India had relatively
thin ( |
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