My science/technology-related thoughts, sometimes controversial, sometimes can be based on limited knowledge base, logic can be non-perfect as well. I develop my vision in iterations. Don't take this blog as an attempt to convince anybody in anything.
Each post in this blog reflects my level of understanding of Tectonics of the Earth at the time the post was written; so, some posts may not necessarily be correct now.

25 July, 2011

Evidences Of Diverging Processes Within Tibet Mountain System.

  Navigate to "Lhunze" using a map tool, set it to "Terrain" mode. The valley spans approx 20km from West to East (and slightly from North to South). The width of the valley is approx 3km. Northern "shoreline" (so to say) of the valley reflects the southern "shoreline" quite nicely. The diverging process, I think, took place.

   The diverging process was rather local.  On further examination of Tibet mountain system we could find many other instances of a diverging processes. Could the pattern had been caused by the global process of the collision between two continents? I am not sure it could. 


   Rather, as I suggested in "Formation Of Mountain Ridges by Broken Process Of Subduction Of A Tectonic Plate." ( http://divergent-boundaries.blogspot.com/2011/05/mountain-ridges-formation-keeping-it.html ) and "Flood basalt" ( http://divergent-boundaries.blogspot.com/2011/07/flood-basalt.html ) the assembly of loosely coupled chunks of crust would react on local extension forces by performing local "forced diverging processes". Also a divergent boundary (even local one) could develop the spreading force if deformations and temperature gradient were present.


   If rifts are found along the center-line of a valley, then, I'd like to think, the diverging process was not smooth, the diverging force was partially of fully developed by the boundary itself as it was described in my previous posts. If the floor of a valley is smooth, then I'd like to think the diverging process was caused mostly by external forces.


   Talking about Lhunze, I'd like to conclude, that the position of the inclined chunks of crust within the local assembly is that, they look East (and slightly South). That is, the vector perpendicular to the plain of the piece of crust would point to East (slightly South) and to somewhat bottom due to the inclination. Recall "Reshaping Pangaea" ( http://divergent-boundaries.blogspot.com/2011/07/reshaping-pangaea.html ), the crust here went from South-East. One or two chunks (whatever fit 20km) due to local extensional forces got broken and diverged off the break-line. Neighbouring chunks, as the chunks within the assembly are loosely coupled, did not broke and did not diverge, that's why the valley developed locally. If it were the global force of the collision between two continents to form the mountain system, I don't see how the local divergent boundaries could had developed.

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