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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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  •  A lot of stuff goes down the trenches, but as temp (2+ / 0-)
    Recommended by:
    mightymouse, RiveroftheWest

    rises, gasses and low temperature minerals become fluid and can return to the surface as magma/lava or rise, cool and add to the base of the continent (do a search on "continental underplating."

    Lavas derived from the mantle would be generally basaltic (gabbroic). Magmas/lavas with rhyolitic (granite) or andesitic (diorite) compositions that form adjacent to trenches may be in part recycled materials carried down by subduction.

    (It's more complicated than this, but I think this is basically an acceptable explanation.)

    •  your assessment. . . (3+ / 0-)
      Recommended by:
      janislav, RiveroftheWest, mightymouse

      spot on. I'm thinking you must be an active geologist outside the shell oil trade. . .I mean, given your insights on volcanism and such. I'd be tempted to ask at what percentage do magma/lavas flow that is granitic based, that is, compared to basalt content that enriches continental underplating? We'll have to have a chat about this, too, I'm thinking.

      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 06:22:37 AM PDT

      [ Parent ]

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