[meteorite-list] Venus, Earth and Widmanstatten lines

From: Darren Garrison <cynapse_at_meteoritecentral.com>
Date: Mon, 07 Sep 2009 22:32:12 -0500
Message-ID: <tpjba5dk8ealebnqi3ji4vodno3umv96ni_at_4ax.com>

On Mon, 7 Sep 2009 18:18:29 -0700 (PDT), you wrote:

>Plate Tectonism is predicted to die away over the many
>aeons ahead. I think there is some prediction to the stop
>date. It's before the sun expires but not before humanity,
>methinks. I forget. 1-2Ga or so, I think, but please don't
>quote me on that.

There was a paper a few years back that I remember reading about in a secondary
source (Scientific American or similar) that said that the rate of water being
returned to the atmosphere/oceans by volcanic activity is less than the amount
being subducted by plate tectonics-- and that if the rate of both stays
substantially the same, the oceans will run dry within a time frame around that
that you just mentioned. So plate tectonics may grind to a halt by then, but
the sandworms probably won't notice.
Received on Mon 07 Sep 2009 11:32:12 PM PDT