Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Large meteorite impacts drove plate-tectonic processes on the early Earth
Psys.org ^ | 9/26/17 | C. O’Neill

Posted on 10/12/2017 1:03:40 PM PDT by JimSEA

An international study led by researchers at Macquarie University has uncovered the ways in which giant meteorite impacts may have helped to kick-start our planet's global tectonic processes and magnetic field. The study, being published in the premier journal Nature Geoscience, explores the effect of meteorite bombardment, in geodynamic simulations of the early Earth.

Our results indicate that giant meteorite impacts in the past could have triggered events where the solid outer section of the Earth sinks into the deeper mantle at ocean trenches – a process known as subduction. This would have effectively recycled large portions of the Earth's surface, drastically changing the geography of the planet," explained lead author Associate Professor Craig O'Neill from Macquarie University

Read more at: https://phys.org/news/2017-09-large-meteorite-impacts-drove-plate-tectonic.html#jCp

(Excerpt) Read more at phys.org ...


TOPICS: Science
KEYWORDS: meteorites; platetectonics; tectonics

1 posted on 10/12/2017 1:03:41 PM PDT by JimSEA
[ Post Reply | Private Reply | View Replies]

To: JimSEA

I have a theory that meteor collision(s) started the outer crust spinning at a slightly different speed than the inner core, which gives us our magnetic field.

And the ‘springy’ action as it oscillates back and forth gives us the CHANGING magnetic field

Mars might have had the same conditions, but after friction caused the oscillations to die away (like a swinging door slows and stops), the magnetic field went away and the solar winds evaporated all the water off the surface.


2 posted on 10/12/2017 1:14:28 PM PDT by Mr. K (***THERE IS NO CONSEQUENCE OF REPEALING OBAMACARE THAT IS WORSE THAN OBAMACARE ITSELF***)
[ Post Reply | Private Reply | To 1 | View Replies]

To: JimSEA

If earth isn’t flat, why are there “plates”? Do you see any plates on a spherical orange? No, you only have those damn plates on the flat table.


3 posted on 10/12/2017 1:20:37 PM PDT by sagar
[ Post Reply | Private Reply | To 1 | View Replies]

To: Mr. K
I have a theory that meteor collision(s) started the outer crust spinning at a slightly different speed than the inner core, which gives us our magnetic field.

Why haven't they equalized over time?
4 posted on 10/12/2017 1:38:50 PM PDT by Sopater (Is it not lawful for me to do what I will with mine own? - Matthew 20:15a)
[ Post Reply | Private Reply | To 2 | View Replies]

To: Sopater

It still is...


5 posted on 10/12/2017 2:02:19 PM PDT by Mr. K (***THERE IS NO CONSEQUENCE OF REPEALING OBAMACARE THAT IS WORSE THAN OBAMACARE ITSELF***)
[ Post Reply | Private Reply | To 4 | View Replies]

To: Sopater

My theory would also explain the seeming lack of history past 10 or 12 thousand ears ago (current oscillation periodicity)

With seemingly abundant evidence of entire civilizations from 65000 to a million years ago


6 posted on 10/12/2017 2:03:59 PM PDT by Mr. K (***THERE IS NO CONSEQUENCE OF REPEALING OBAMACARE THAT IS WORSE THAN OBAMACARE ITSELF***)
[ Post Reply | Private Reply | To 4 | View Replies]

To: JimSEA

If the core of the Earth is sufficiently massive, it would rotate at its own speed. Inertia would be enough to explain the outer mantle and crust turning at a different speed. Similarly, the poles would try to turn slightly faster than the equator causing plate tectonics through Coriolis forces. Observing the rotational behavior of the sun and Jupiter is proof that such a thing is possible, at least insofar as the outside of a planet is concerned. The core of the Earth is composed of iron and some heavy elements and is very dense. The magma above is hot and somewhat fluid providing lubrication between the solid crust and the core, and allowing them to rotate at different speeds.


7 posted on 10/12/2017 2:05:08 PM PDT by webheart (Grammar police on the scene.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: JimSEA

From what I understand a lot of water is required for plate tectonics.


8 posted on 10/12/2017 2:05:41 PM PDT by Moonman62 (Make America Great Again!)
[ Post Reply | Private Reply | To 1 | View Replies]

To: JimSEA

I have a theory. Plate tutonics cause global warming.

Hey, don’t laugh. It’s as valid as “fossil “ fuels cause globull warming.

5.56mm


9 posted on 10/12/2017 2:11:32 PM PDT by M Kehoe
[ Post Reply | Private Reply | To 1 | View Replies]

To: Moonman62

All our geology depends on water and there is certainly a lot in the mantle, some in minerals there and brought down by plate subduction and minerals in the plate. Volcanoes gave us our atmosphere and much water. They are very much tied to plate subduction and the water brought down.


10 posted on 10/12/2017 2:21:41 PM PDT by JimSEA
[ Post Reply | Private Reply | To 8 | View Replies]

To: JimSEA

When the Sudbury event happened, I read there was a large chunk of the NA plate that was actually flipped over, just like a pancake!


11 posted on 10/12/2017 2:25:25 PM PDT by djf ("She wore a raspberry beret, the kind you find in a second hand store..." - Prince)
[ Post Reply | Private Reply | To 1 | View Replies]

To: djf

Wow!


12 posted on 10/12/2017 2:28:56 PM PDT by JimSEA
[ Post Reply | Private Reply | To 11 | View Replies]

To: JimSEA

It’s not surprising.
I’ve also read that the size of the Sudbury meteor (asteroid??) was something like 6 miles wide, and it came almost directly in.

Can you say Boom!!!???


13 posted on 10/12/2017 2:33:00 PM PDT by djf ("She wore a raspberry beret, the kind you find in a second hand store..." - Prince)
[ Post Reply | Private Reply | To 12 | View Replies]

To: JimSEA

Or not


14 posted on 10/12/2017 3:07:14 PM PDT by Nifster (I see puppy dogs in the clouds)
[ Post Reply | Private Reply | To 1 | View Replies]

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson