CompuServe Messages

Subduction & Ocean Basin

    20-Mar-95 22:56:28
Fm: Doug Mitchell 70621,702
To: Kamron Kirkconnell 73740,2246
Hi, Kamron– >> I agree that a unified motion is what is stated but you cannot have a unified motion into and out of a large arc. Says who? All it needs is some subduction where the plate is not moving quite perpendicular to the subduction boundary. >> This is what I was pointing out. Another of earths head scratchers. If the Owens fracture zone parallels India's movement, why is that any big surprise? It was not on the direct path, but I see no reason it should not remain parallel to the nearby action. >> I put it [Madagascar] there at first but now have it south at the next inset in one simulation and north in the gap at the top of the horn of africa. Keep an eye on the geological formations. Madagascar fits the Mozambiquan mountain province, but I am not aware that province extends as far north as that (besides, that leaves you scrambling for a home for Arabia. >> I see the mediterranean as a rift that split europe from asia and Greenland from North America What does the Mediterranean have to do with Greenland?!? There was once true ocean (the Tethys Sea) between Europe and Africa (where the Alps are now), but that has since closed. The Mediterannean floor is all African continental rock (maybe some European – I do not know where the boundary is outside the Alps), not oceanic crust, as far as I know – it is just a low part of Africa that got flooded. It was more or less dry land 6 million years ago. >> Look at Antarctica for a clear example of what my observation states. The motions in some places are 90 degrees to the observed shift faults. Where? –Doug