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View Diary: DKos Special Supplement: Plate Tectonics And The World’s Changing Geography (Part 2 of 2) (68 comments)

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  •  Nice summary. It is particularly important to note (10+ / 0-)

    that plate motion seems to be tied mainly to subduction rather than diverging convection cells along the mid-ocean ridges. An interested individual need only do a search on "slab suction and slab pull" to get more information.

    There is a substantial lag in time between the acceptance of a new concept and it's inclusion in most school textbooks, so most current texts will not address this "new" information.

    •  WOW. . . (3+ / 0-)
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      mommyof3, Jim R, RiveroftheWest

      I'm going to have to contact you via your profile's email account and discuss this matter at length. You are one of the many reasons why I write diaries for our community. You can't get this kind of feedback on most sites, let me tell you, but what you said about the substantial lag time is absolutely right on the money. I tried to bring up the subject matter to the most current data, but of course, it's changing as we speak. In any event, janislav, subduction is what's going on with plate bumper cars more times than not. When our plate slipped over the eastern edge of the Pacific plate long ago, that subduction trigged the farollon islands and one other micro oceanic plate, and of course, up goes the Colorado Plateau, eventually, in either 3 or 4 pulses, more or less, all by the geophysical force of good 'ole subduction. The one thing most of us aren't sure about, though, is the timing of the Plateau's uplift. That's why I think sometime between the 70 and 30 Ma figure seems about right. If you know or think or feel differently, let me know. Meanwhile, thanks an awful lot for your erudite response and I will be in touch with you soon (if you don't mind). Nice to talk geology with folks who know the subject well. Appears that you do.

      Treat the world (yourself, and others) as part of a living organism. Everyone and everything will benefit.

      by richholtzin on Tue Apr 16, 2013 at 12:17:56 PM PDT

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    •  good point. . . (1+ / 0-)
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      about lag time. Andre P (and I can never spell that Ruskie's last name (though he is a fellow field institute instructor) likely will be able to point a finger or two in the right direction for me to do some more sleuthing on this topic. So will Wayne Ranney, also a fellow instructor. Slab suction and slab pull should, as you pointed out, also get a Google search hot to trot on the info. Would like to see what the current profs in this line of work are thinking/doing. Thanks, again, for your help and insight on this subject, janislav. I take it you are actively working/teaching in your field, geology something or other???

      Treat the world (yourself, and others) as part of a living organism. Everyone and everything will benefit.

      by richholtzin on Wed Apr 17, 2013 at 04:09:50 PM PDT

      [ Parent ]

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