Re: (XSS229/3A)/Plate Tectonics (Convergent Plates) -- GEOFORUM

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Date Posted: 21:41:38 08/23/99 Mon
Author: Dr. Chatterjea
Subject: Re: (XSS229/3A)/Plate Tectonics (Convergent Plates)
In reply to: Charles 's message, "Re: (XSS229/3A)/Plate Tectonics (Convergent Plates)" on 07:54:56 08/19/99 Thu

> > From my previous lessons in A-levels, the Himalayan
> > example is used to illustrate the example of two
> > converging continental plates. In "Modern Phy Geog"
> by
> > Strahler the same example is used. Because i have not
> > come across any discrepancies in my readings yet, i
> > would think the example still holds true.
> True but then can I ask why the Himalayas itself is
> actually sedimentary rock (indicating some evidence of
> having originated from oceanic crust - now i think
> there is such a thing as oceanic crust too...)
In Himalayan orogeny the two continental plates moved towards each other. As that happened the frontal parts of the the two plates buckled down at the Tethys which was a geosyncline (a big syncline). Sediments from the two continental plates now poured into this Tethys geosyncline. As the sediments piled up, the great weight of the sediments further lowered the level of Tethys and eventually this led to the two continental plates to come even closer. Finally the pressure on the sediments was too much and they were all piled up and squuzed up high to form the Himalayas. Go to www.USGS.gov site for a step by step description of the happenings.

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