Re: paleomagnetism and EE
- From: David Iain Greig <dgreig@xxxxxxxxxxxx>
- Date: Mon, 20 Aug 2007 02:36:07 +0000 (UTC)
Florian <first_name@xxxxxxxxxxxxx> wrote:
Jim Willemin <jim***willemin@hot***mail.com> wrote:
David Iain Greig <dgreig@xxxxxxxxxxxx> wrote in
news:cabal-slrnfcgg6u.2svu.dgreig@xxxxxxxxxxxxxxxxxxx:
Ernest Major <{$to$}@meden.demon.co.uk> wrote:
In message <cabal-slrnfcfnnq.2i9u.dgreig@xxxxxxxxxxxxxxxxxxx>, David
Iain Greig <dgreig@xxxxxxxxxxxx> writes
So 1.5 Bya, the protoEarth was 1700km in radius. And Maxlow says
the continents all ft together so nicely.
Africa is 8000km tip to tail N/S. The protoEarth of 1.5Bya would
have a pole-to-pole circumference of about 2*pi*1700km, or 10680km.
So Africa, being 8000km long, would have reached over 3/4 of the
way from the South Pole to the North Pole.
It being the next morning, I think I screwed up. Africa would wrap
around 3/4 of the Earth, pole to pole and back again half way.
Rocks of equal age would
show astonishly different paleomagnetic orientation from those of
today, clearly showing the continent to have covered much more of
the Earth 1.5 Bya. On today's earth, the rocks would indicate the
African craton formerly covered a much larger area, right?
But nobody's seen this in the geological record that I know of.
Did I just figure out another way to disprove EE? Please comment.
Yes and no.
Yes - palaeomagnetism is yet another bit of data ignored by the EE
"empirical" model. No - because you're assuming that Africa existed
as a single unit 1.5 billion years ago.
Maxlow's animation shows it as a single unit. I'm just trying to look
for logical conclusions I can draw from it.
--next objection--
The dry land area of the Earth is 149 million square km. Taking away
all the water area, this would fit on a globe of radius r where Area =
4*pi * r^2.
So r = sqrt (A/(4*pi)) or sqrt (1.49e8/(4*3.1415))
r = 3443km
So I'm a bit curious how Maxlow fitted the continents onto a 1700km
radius Earth by simply deleting the oceanic crust.
The surface area of a 1700km radius Earth would be 36 million square
km, or about 1/4 the total land area of the current Earth. This
wouldn't even fit Asia (29% current land area).
Most cratons are older than 1.5 Bya, so cannot be formed by expansion,
or they would radiodate at younger than 1.5Bya in areas where magma
upwelled (Deccan Traps, Siberian, Columbia, etc.). But they must have
expanded since Maxlow's model says the Earth only grew to a 3443km
radius some 200 Mya.
Am I missing something from being sleepy? Surface area of a sphere
is 4 pi r squared, land area of the earth is 149 million square km...
Does Maxlow explain this? The North American craton alone would be
some 10% or more of the current Earth surface, and the damn thing is
mostly older than 1.5Bya, so it'd cover most of the protoEarth...
Florian could you comment please? Most of the cratons and platforms
are older than 1.5 Bya, so would not fit on a 1700km radius protoearth.
Are Don's beloved 'animations' of current-size continents, I wonder?
If so they don't represent Maxlow's model at all; he indicates in his
graph that continental lithosphere has increased since 1.5 Bya.
Do the animations include shrinking continents? If not, simply 'removing
the isochrons' for oceanic lithosphere is an inaccurate model of EE, or
at least of Maxlow's GET theory. Certainly shrinking current continents
without removing any continental lithosphere *younger* than 1.5 Bya would
render the animations useless as well.
--D.
.
- References:
- paleomagnetism and EE
- From: David Iain Greig
- Re: paleomagnetism and EE
- From: Ernest Major
- Re: paleomagnetism and EE
- From: David Iain Greig
- Re: paleomagnetism and EE
- From: Jim Willemin
- Re: paleomagnetism and EE
- From: Florian
- paleomagnetism and EE
- Prev by Date: Re: David Warren: The tyranny of science
- Next by Date: Re: paleomagnetism and EE
- Previous by thread: Re: paleomagnetism and EE
- Next by thread: Re: paleomagnetism and EE
- Index(es):
Relevant Pages
|
