Re: Where did the extra mass come from?


"Florian" <auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx> wrote in message
news:1imk7ut.1oi5fj7g7l1h1N%auxotectonics_deletethis@xxxxxxxxxxxxxxxxxxxxx
George <George@xxxxxxxxxx> wrote:


Pyrolite is a silicate. No one said it wasn't. Olivine is also a
silicate,
as is perovskite. What's your point? Their melts are silicate poor
nonetheless.

My point is that you build yet another strawman.

That all of these melts are silicate poor is a strawman? How so? That
they
are silicate poor IS the point.

Never heard about fractionnal crystallization? What happen when
volatiles are added to peridotite? Do you still get silicate poor melts?

Volatiles are added to peridotite at MORs all the time (hydrothermal fluids
from fractures in the ocean floor). Clue: The resulting melt is said to be
silica poor.

Surrounding lithosphere is recovered by layers pushed by new emplaced
rocks at upduction zones. It get buried. As Earth basically double in
size in 250 My, they can easily be deeply buried by now.

And so you are arguing that the surface gets recycled into the mantle and
back again. Wow, that sounds remarkably like plate tectonics!

The big difference is in the scale.
Plate tectonics claims that ALL the oceanic crust is recycled in 200 My.

You'll have to point out what is your source for that statement.

Upduction implies that just a few hundred km get buried.

Since all you are doing here is renaming subduction, and since you now agree
that recycling occurs, how is growth occurring?

George


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