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

George <George@xxxxxxxxxx> wrote:

"Florian" <auxotectonics_deletethis@xxxxxxxxxxxxxxxxxx> wrote in message
news:1in2upw.xtnuof561qvvN%auxotectonics_deletethis@xxxxxxxxxxxxxxxxxxxxx
George <George@xxxxxxxxxx> wrote:


We've already established that andesite cannot form from peridotite.

Look for *Dehydration melting of peridotite* ignorant goose.

http://www.faqs.org/abstracts/Earth-sciences/Possible-role-of-amphibole-in
-the-origin-of-andesite-some-experimental-and-natural-evidence.html

"The basaltic andesite composition of the uppermostmantle crust results
from the magmatic reaction of cooling, hydrous *mafic* liquid with
anhydrous ferromagnesian deposits."

Emphasis on *mafic*. Or may be you ignore the definition of mafic?
And that work is 16 years old. A lot was done in geochemistry during
that period, other mechanisms have been described.

Weird question. Those old basins were closed by upductions and are now
under the form of ophiolites. The old sediments are present above the
ophiolites.

Umm, the Michigan basin is closed? It certainly is buried by kms of
sediments, but it is STILL a basin. Where are the ophiolites in the
Michigan basin?

According to you, the michigan basin is oceanic in nature? Do you
remeber that we're dicussing ocanic basin or is it alzheimer again?

Absolutely. The Michigan basin is full of salt. Where in the hell do you
think all that salt came from?

That is not a conclusive argument. Evaporites are also present at the
place of former epicontinental seas.

The basement of the basin is a rift composed
of basalt. Same for the Illinois basin and the Appalachian basin.

That's good enough to me. Those are exactly the kind of narrow oceanic
basin that developped by strechting of the cruts as Earth was slowly
growing. At that time, these basins never developped into 10000 km wide
ocean, simply because the Earth was much smaller and grew at a slower
rate. There were only "aborted ocean". The global oceanization of Earth
is a very recent. Less than 200 My 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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