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on Sat, 25 Feb 2006 22:12:53 GMT, George <george@xxxxxxxxxxxxxxxxxxxxx> sez:
` The MOR spreading centers themselves, in a sense, are a sort of linear
` hotspot. If you look carefully at spreading centers, such as the East
` Pacific Rise, as shown in the link below:
` http://marineemlab.ucsd.edu/Projects/EPR2004/Plots/EPR_view3d1.jpg
` You will snote in that image that volcanoes form on the rise and then are
` carried off of it on either side through plate spreading (I suspect that
` volcanoes similar to the ones discussed for Vancouver are likely to be
` found on the ocean floor to the west of the spreading center there). I
` think that is the same kind of mechanism that we are seeing in Vancouver,
` and I think this is different than what we see with Yellowstone. And note
` that usually with these sorts of spreading center volcanoes, as they move
` off the spreading center, they eventually become extinct. Yellowstone is
` located far from any recognized MOR, has erupted relatively little oceanic
` basalt, and certainly is not extinct. Though there may be an indirect
` relationship with what has occurred off the west coast, I think the
` Yellowstone hotspot has a different, though related, origin. I think
` Yellowstone is more directly related to Basin and range geology than to the
` Pacific Northwest coast. But that is just my humble opinion, about which I
` reserve the right to change without notice. :-)
` Here is a link to a report published by Christiansen, et. al. on the origin
` of Yellowstone. Read particularly the conclusions, as they are germaine to
` this discussion:
` www.dur.ac.uk/g.r.foulger/Offprints/Yellowstone.pdf">http://www.dur.ac.uk/g.r.foulger/Offprints/Yellowstone.pdf
Thanks for the links, George. Great, much to think about. I wrote
a post asking for help deciphering some of the stuff in the pdf,
but my terminal program suddenly decided to crash, and I lost it,
don't have time or energy to rebuild it now, perhaps later in the
week...
--
==========================================================================
vincent@triumf[munge].ca Pete Vincent
Disclaimer: all I know I learned from reading Usenet.
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