Quote: Originally Posted by Dexter Sinister
We've gone around this twice before, I'm not going to do it again.
Thank God for small favors, literally I said the Lords prayer and asked or thanked Hin for that bit of news ..... I'll let you ponders on if it came before or after reading your last (and final) post on the subject.
With magma (just the very upper stuff, it gets much thicker the further you go into the mantel. Granite would be as buoyant as a cork on the Dead Sea. Being twice the density resistance would be great. If the Rockies were made from subduction the what was being subducted would not go smoothly. The mountain range that would be formed would be even higher than the Rockies.
The spreading around Greenland and Northern Canada would indicate a break and then some drifting. The spread would be similar to a high-speed impact, on a floating solid that is shattered by an impact that would be large enough to create what today is called Hudson's Bay. That section of land is billions of years old.
I'll even agree that the rift that is spreading off the coast of BC has the part that is heading east is a subduction zone, but it is what would have become brand new land except it is 'recycled'. As much as has flowed to the east has flowed back under most of the Americas in that same amount of time. (with some minor variances caused by the crack not being perfectly straight over all that time),That doesn't take away that the initial crack would have been from uplift inside the mantle due to a rise in pressure from inside the mantle. A substance that is twice as dense as granite would expand how much per degree of temperature rise? Sooner or later something will give if the temperature rises enough. A slow flow that 'oozes' for 180,000,000 years could still have started with a major event that did 90% of the 'growth'. Put a blanket of ice several miles deep and the initial crack would not eject much material even at a much higher initial pressure.
