We are discussing a paper titled as:

Mantle flow, dynamic topography and rift-flank uplift of Arabia

written by Amy Daradich from Physics department of Toronto University.  It was very nice to see an interest from one who is from Canada to put an effort mantle dynamics controlling the deformation of Arabian plate.  The information for whom is given in below.

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Ms. Amy Daradich

Graduate Student Address: Department of Physics University of Toronto 60 St. George St. Toronto ON, M5S 1A7 Canada   Office: McLennan Physical Laboratories Rm. 403   Phone: 946-7058   Email: adaradich@physics.utoronto.ca   Homepage:   Group(s): Geophysics

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Please find the Q & A for Buleid's presentation.

Q.1 What do you mean by seismically fast mantle?

     Cold Dense mantle, as it is dense therefore velocities will be fast in that.

Q.2 In the megaplume area, would you expect high velocities or low velocities?

     Low velocities, as due to temperature, the material will become less denser to raise upward and     the velocities will be decreased in that zone.

Q.3 Why don't the thermal and mechanical models offer a good explanation for tilting of Arabia?

As these models are largely concerned with flank uplift within a few hundred kilometers of the rift basin, therefore, these models don't provide a good explanation for Arabian tilt.

Q.4 What does thermal model say about the rift-flank uplift?

According to thermal model, uplift can result from depth-dependent stretching
or from the heating of flanks by small-scale convection.

Question #1:

 

Describe the mean features of models that used to explain rift-flank uplift.

 

Answer:

 

1. Thermal Models: Uplift can result from depth dependent stretching or from heating of flanks by small scale convection.
2. Mechanical Models: Indicate that upward flexure may occur if the lithosphere maintains finite strength during rifting.
3. Geometric Models: Explain the symmetry of uplift in terms of a single low angle detachment penetrating the entire lithosphere.
4. Melt Process Models: Extensive flank uplift may also result from magmatic underplating due to asthenospheric partial melting.

 

Question #2:

 

Illustrate the main steps used by the author in formulation of his model.

 

Answer:

 

1. Prescribing density field within the model domain by using results from seismic tomography.
2. The governing equations are solved for instantaneous flow fields throughout the domain.
3. Dynamic topography is computed by applying surface normal stresses output from the convection code to a model of elastic beam deformation.

 

Question #3:

 

What the author claimed about the tilting of the Arabian platform?

 

Answer:

 

Author stated that the topography dynamically supported by large scale viscous flow in the mantle is responsible for the dramatic tilting of the Arabian platform. The tilting also is enhanced by seismically mantle beneath northeast Arabia, which acts to dynamically depress the overlying plate in this area.

 

Hi Jubran

I checked your answers ,and it seems to me they are OK.

Thank you for your time that you spend it to read my paper.

Best

..........................................
HI Hussam

Your answers are OK.

Thanks.Regards.

Hi Osman

I saw the attachment and I checked your answers ,and I belief that you

understand my paper very well.


Thanks for every thing.