Ancient Imbalances Sent Earth's Continents "Wandering"

National Geographic News ^ | Continents "Wandering"

[Domestic Church]

Does polar wander ever correlate with polar flip flops?

[SunkenCiv]

Kirschvink site:freerepublic.com

Google

Thanks Blam.

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[SunkenCiv]

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[SunkenCiv]

Okay, yeah, I had a lot of stuff in a file called “Kirschvink”.

Caltech Scientists Find Evidence For Massive Ice Age When Earth Was 2.4 billion Years Old
http://mr.caltech.edu/media/Press_Releases/PR11789.html

Scientists discover that “evolutionary big bang” may have been caused by Earth losing its balance half a billion years ago
Thursday, July 24, 1997
http://mr.caltech.edu/media/lead/072497JLK.html

Texas A&M Oceanographer Challenges Plate Tectonics As Reason For Poles’ Shift
http://www.sciencedaily.com/releases/2000/01/000125053438.htm

Neoproterozoic Paleogeography and Global Climate: SWEAT and the Snowball Earth?
Dave Evans and Joe Kirschvink
http://www.gps.caltech.edu/MagLab/proj_dave.html

Evidence for a Large-Scale Reorganization of Early Cambrian Continental Masses by Inertial Interchange True Polar Wander
Joseph L. Kirschvink, Robert L. Ripperdan, David A. Evans
http://www.sciencemag.org/cgi/ijlink?linkType=ABST&journalCode=sci&resid=277/5325/541

Snowball Earth
http://www.newscientist.com/ns/19991106/snowballea.html

Did a Quick Spin Pump Up Evolution?
[dead link]
Posted 25 July 1997, 5 pm PST
http://www.apnet.com/inscight/07251997/grapha.htm

Over the last 20 years, geobiologist Joseph Kirschvink of the California Institute of Technology in Pasadena and his colleagues have sought hints of this phenomenon, which has been found on Mars and the moon, by measuring the fossil magnetism in rocks from Australia and North America. They and others have also dated the rocks—parts of the ancient supercontinents of Gondwanaland and Laurentia—by measuring ratios of radioactive isotopes. After analyzing the records before and after the evolutionary explosion, they found that the orientation of the magnetism in rocks from both land masses changed direction by 90 degrees between 534 and 518 million years ago.

[SunkenCiv]

UC Riverside Researchers’ Discovery Of Electrostatic Spin Topples Century-old Theory
University Of California - Riverside | April 2, 2003 | Anders Wistrom and Armik Khachatourian
Posted on 04/03/2003 7:28:43 AM PST by forsnax5
http://www.freerepublic.com/focus/f-news/883969/posts

Scientific maverick’s theory on Earth’s core up for a test
SF Chronicle | Monday, November 29, 2004 | Keay Davidson
Posted on 12/05/2004 11:17:28 AM PST by SunkenCiv
http://www.freerepublic.com/focus/chat/1294934/posts

[Centurion2000]

I can imagine a “jumpstart” being given to existing plate motion, say by the Chicxulub impact, a six mile diameter rock, producing a 100 teraton blast, leaving a crater over a hundred miles across

Doubt it. What happens when you shoot a bowling ball with a .22 ? .... Nothing.

[yefragetuwrabrumuy]

A bowling ball is solid throughout. While the Earth has a solid core, it has a very thick layer of magma over that core, with just a thin, broken crust floating on it.

Even the firm, steady push of ice may be enough to prevent a smaller volcanic eruption.

I do not suggest that a six mile ball of rock can muscle an enormous continental plate around, however, it just might be able to “jiggle” it at the point of structural weakness where it meets other plates.

As is demonstrated with crystalline structures, a fault on the surface of the structure creates a multiplicative effect of weakness at the area on the base of the fault. So the effect of that impact might have been like a sharp rap to a pane of glass that had been scored by a glass cutter. It causes a failure along the score which splits the glass in two.

This might have generated all sorts of interesting volcanic effects, from supervolcanoes to something like the basalt floods of Washington and Oregon.

[Centurion2000]

Ok, now those are interesting and definitely possible consequences of your impact.

[Carilisa]

Found a fascinating map of Michigan. How far are you from the bullseye?

http://tapestry.usgs.gov/features/09michigan.html

A giant incomplete bulls-eye is centered on the state of Michigan. Extending into Illinois, Ohio, Indiana, Wisconsin, and Ontario, this annular pattern outlines the Michigan Basin, a bowl-shaped structure of uncertain origin that contains over 4 km of inward-dipping Paleozoic strata and a veneer of Jurassic sedimentary rocks. This mysterious basin is located in the tectonically less active interior of the continent, between the Appalachians and the Rocky Mountains. It subsided rapidly from Cambrian to Silurian time as it filled with shallow-water marine sediments, some of which host deposits of petroleum, coal, and salt.

http://tapestry.usgs.gov/features/z_images/z9.jpg

[SunkenCiv]

Wow, interesting. The center's probably 90 minutes or more from here (not as the bird flies).

Rain of Iron and Ice
by John S. Lewis

On November 27,1919, a meteorite fell into Lake Michigan near the Michigan shore. "Residents of Battle Creek, Kalamazoo, South Bend, Grand Haven, and other Western Michigan cities fled from their homes in panic, fearing an earthquake. Houses were shaken, the country was illuminated as by a bright sun's rays, so all-enveloping it was impossible to tell from which direction the flare came, the earth trembled for half a moment and then came a deep prolonged rumbling as of a terrific explosion." (p 159)