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( 2 comments — Leave a comment )
jordan179
Jan. 3rd, 2014 07:36 am (UTC)
I would guess that as the western Atlantic oceanic crust subducted under the eastern North American continental plate margin, a few hundred miles in from the boundary CO2 and steam bubbled up from the melting ocean crust, putting pressure on the continental plate from underneath, and relieved that pressure in vulcanism. And the subduction was more extreme when the Atlantic was narrower. Right?
polaris93
Jan. 4th, 2014 11:57 pm (UTC)
That sounds right. The increase in size of the Atlantic oceanic crust would have to have exceeded the westward movement of the North American Plate at that time, ensuring that the western edge of the oceanic crust would be forced up against the estern edge of the North American Plate and caused to go under the latter. If so, that's how it would work.
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