[Widdekind]

Oceanic Crust, sinking into the Mantle at Subduction Zones, winds downward, and piles up, upon Core-Mantle Boundary, in great snaking coils*. This is at a depth of 2700 km**.

* Discovery Channel Inside the Earth (TV)
** Martin Ince. The Rough Guide to the Earth, pg. 108.

CONCLUSION:

Oceanic Crust extends for over 3000 km into the Earth. And, Oceanic Crust grows at an average rate of "a few centimeters per year"*. Thus, Oceanic Crust has been sinking into the Earth for over 1 billion years.

* Ince, ibid., pg 62.

Now, about 2 billion years ago, the Great Oxygenation Event caused Iron to precipitate out of the Earth's Oceans, and rain down as Sediments upon the Ocean Floor*. Since Iron is dense, perhaps these Iron-rich Sediments began pulling Oceanic Crusts deep down into the interior of the planet, all the way to the Iron-rich Core.

* This changed the color of Earth's Oceans, from Green, to Blue. See: Discovery Channel Inside the Earth (TV)

[Geosciences-Forum.com]

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[Widdekind]

Schematic Representation of diagram depicted in the Discovery Channel documentary Inside the Earth (TV)

[Platzhalter für ein Bild]

[Geosciences-Forum.com]

Log dich ein, um die Werbung auszublenden und alle Funktionen nutzen zu können.

[Widdekind]

The early Earth may have had 10 times more water than today*. That fact agrees exactly with this analysis.

* http://www.geosciences-forum.com/htopic598-.html

[Widdekind]

Hot Spots are hot plumes, through the Mantle, coming up from the Core, all the way to the surface. Conversely, Oceanic Crusts sink from the surface, all the way down to the Core. Thus, there are several structures which thread through the Mantle completely.

[Widdekind]

http://www.sciencedaily.com/releases/2006/05/060511083341.htm

Up to 10% of Earth's oceans have been subducted into the Mantle.

[Widdekind]