[aspect-devel] Continental extension model

Mohamed Gouiza M.Gouiza at leeds.ac.uk
Thu Oct 20 08:02:57 PDT 2016

Hi John,

In the continental extension input file that you sent me, the mantle compositional field is defined as 70.e3 && y>-100.e3
Is the -100.e3 a typo or is it because of the prescribed inflow at the base of the model?


From: Aspect-devel [mailto:aspect-devel-bounces at geodynamics.org] On Behalf Of John Naliboff
Sent: 10 October 2016 17:12
To: aspect-devel at geodynamics.org
Subject: Re: [aspect-devel] Continental extension model

Hi Mohamed,

An example continental extension input file is attached, which will be submitted as a cookbook example in the next few days.

In this example, extension is driven by prescribed outflow on the sides and inflow at the base.  The rheology is dislocation creep with different flow laws for the upper/lower crust and mantle.  Internal friction angle (20 degrees) (20 MPa) are within the range of commonly used values.  No strain-weakening, but I have a pull request open that implements this.

Most extension problems include the asthenosphere, while this model only goes down to 100 km.  As such, I would only use this type of setup for studying early stage extension.  Any problems examining extension from start to breakup should extend to at least 150 km. In this case, one might alter the simple boundary conditions I've prescribed.

Hope this helps and let me know you if you have any questions about the input file.



John Naliboff

Assistant Project Scientist, CIG

Earth & Planetary Sciences Dept., UC Davis
On 10/10/2016 12:59 AM, Mohamed Gouiza wrote:
Hi John,

I looked for the continental extension model that you showed in the online workshop last month, but couldn’t find it in tests/ folder.
I’ve been running several extension models with the visco-plastic material model and I am interested in knowing the visco-plastic law parameters that you used and how do you prescribe the boundary conditions: is the extension rate defined the same way as in the crustal deformation example in the cookbook by Cedric?

Thank you

Mohamed Gouiza, Research Fellow
Basin Structure Group, Institute of Applied Geosciences
University of Leeds, School of Earth and Environment
Leeds,  LS2 9JT, UK
M.Gouiza at leeds.ac.uk<mailto:M.Gouiza at leeds.ac.uk>
+44 7985 782073


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