What question did this study set out to answer?

To determine whether dynamic stresses produced when weak lower crustal channel flow encounters rheological obstacles can generate anomalously high topography and localized extension along plateau boundaries.

July 20, 2005Geophysical Journal InternationalOpen Access

Dynamic topography produced by lower crustal flow against rheological strength heterogeneities bordering the Tibetan Plateau

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Authors

MCMarin K. ClarkUniversity of Michigan JBJohn W. M. BushMoscow Institute of Thermal Technology LRL. H. RoydenMassachusetts Institute of Technology

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Implication

Geodynamic modeling demonstrates significant dynamic topography along the eastern Tibetan Plateau margin, indicating that lower crustal flow obstruction drives local mountain uplift.

Key Points

To determine whether dynamic stresses produced when weak lower crustal channel flow encounters rheological obstacles can generate anomalously high topography and localized extension along plateau boundaries.
Modeled dynamic stresses from viscous channel flow against rheological heterogeneities using thin-gap lubrication equations.
Calculated surface dynamic topography by applying computed basal shear and normal stresses to an elastic upper crust layer.
Compared model predictions with topographic profiles across the eastern Tibetan Plateau margin, where channel flow impinges on the rigid Sichuan Basin.
Dynamic stresses scale uniquely with the parameter ratio μŪ/h², depending directly on lower crustal viscosity (μ), mean velocity (Ū), and channel thickness (h).
Channel flow around a rigid cylindrical barrier at 80 mm yr⁻¹ within a 15 km thick channel of viscosity 2 × 10¹⁸ Pa s generates up to 1500 m of dynamic topography across a zone tens to 100 km wide.

Cite This Study

Clark et al. (2005) studied this question.

synapsesocial.com/papers/69f7fe11bf316d0569a62f15 https://doi.org/10.1111/j.1365-246x.2005.02580.x

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Implication

Geodynamic modeling demonstrates significant dynamic topography along the eastern Tibetan Plateau margin, indicating that lower crustal flow obstruction drives local mountain uplift.

Dynamic topography produced by lower crustal flow against rheological strength heterogeneities bordering the Tibetan Plateau

Discussion

Member takes

Implication

Key Points

Cite This Study

Dynamic topography produced by lower crustal flow against rheological strength heterogeneities bordering the Tibetan Plateau

Discussion

Member takes

Implication

Key Points

Cite This Study

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