Re: ALL the oceanic crust is recycled in 180 My: unrealistic

On Sep 7, 3:17 pm, auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx
(Florian) wrote:
George <Geo...@xxxxxxxxxx> wrote:
"Florian" <auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx> wrote in message
news:1imk7ut.1oi5fj7g7l1h1N%auxotectonics_deletethis@xxxxxxxxxxxxxxxxxxxxxx
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).

Jeez, yet another idiocy. No it doesn't! the water does not reach the
place of melting! If it was the case, you'll get silica rich magmas.

Please tell me how you can get Si rich magma by adding water.
You get Si rich magma by recycling weathered rock and/or
granitization.
Are pillow lavas Si rich ?

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.

Jeez. Your ignorance of basic plate tectonics principle is pathetic.

Except a small area in the Med sea, ALL of the ocean floor is less than
180 My. If you assume (Plate tectonics assumtion) that the size remained
constant, then you asume that there was at least the same surface of
ocean floor 180 My ago (2/3 of Earth surface), and that this floor was
totally destroyed in the last 180 Ma (recycled).

=> ALL the oceanic crust is recycled in 180 My leaving no floor older
than 180 My.

Totally unrealistic isn't it? Yep, but that is what YOU believe.


See subduction.


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?

What don't you understand in "The big difference is in the scale."
If there is only a few thousand square km that are recycled, then almost
all the floor produced by ridges is extra surface.

So why is nothing older ? Some seafloor ( somewhere ) should be very
old.


--
Florian
"Toute vérité franchit trois étapes. D'abord elle est ridiculisée..
Ensuite, elle subit une forte opposition. Puis, elle est considérée
comme ayant toujours été une évidence." - Arthur Schopenhauer

.

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