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

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Date Posted: 21:30:53 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 07:50:35 08/19/99 Thu

> > Yes, one oceanic crusts does indeed subduct the other
> > crusts depending on which one is more dense. The
> > assumption being that even a slight deifference in
> the
> > mineral composition of the two different crusts
> layers
> > will cause subtle changes in density. Good example of
> > landforms associated with two converging oceanic
> > plates would be Japan and her many volcanic cones and
> > the Japan sea trench.
> To add to this; (and only because Kalayni discussed
> this with us) it also depends on the impact with which
> one collides against the other. Much like a Mercedes
> and a Nissan: guess which goes up(Nissan of course)
> but a Merc and a Merc...depends which goes faster and
> how the impact hit...you know like 2 coins(ever played
> kuti kuti)...now I begin to sound lie a teacher
> again...using everyday analogies to explain real world
> scenarios.
> > I have not seen any book that distinguishes between
> > the terms crusts and plates when it comes to Plates
> > Tec. Theory. The two terms are able to be used to
> mean
> > the same together with lithosphere? I am not too sure
> > about this one.
> Plates are what we use for the PT theory...the ones
> that move towards, away and slide past each other.
> Crusts are those that your see above the water (how do
> you say it technically...land masses) so there is
> Oceanic and COntinental plates but really you have
> continental crust.
> Is this correct Kalayni?
A continental plate is one that is 'primarily' made of continental crust. Similar situation for the oceanic plates, although some continental crust might be involved. They have nothing much to do with being above or below water. Is more dependant on the composition of the plates.

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