Re: Detailed ocenaic floor analysis. What does it really tell us?


"Florian" <firstname@xxxxxxxxxxxx> wrote in message
news:1hw2dv3.1f9rigjqzk492N%firstname@xxxxxxxxxxxxxxx
J. Taylor <nchiwana@xxxxxxxxxxxxxxxxxxxx> wrote:

I do not think merely casting doubt on plate tectonics supports
Expanding Earth. I think the pattern on the ocean floor shows plate
tectonics is false and it supports only an expanding Earth

I looked carefully at the pattern. Here is my analysis.

First I read that webpage from Neal Adams:

http://www.nealadams.com/EarthProject/fromthedesky.html

He calculated the floors for each isochrons and found that it was
roughly doubling every 10 MYA.

His numbers were too much perfect, so I made all the calculations myself
:-)

First I got the isochron data from the ftp site at Uni of Sydney:

ftp://ftp.es.usyd.edu.au/pub/agegrid/

Only one file is necessary age_1.6.grd.gz

Then I built Mollweide projections of the earth using GMT
(http://gmt.soest.hawaii.edu/) and the grid file. The Mollweide
projection is great because it is an "equal area" projection.

I built maps showing the whole globe in black, then only continents in
black, and finally maps only showing black surface of oceanic crust
dating from -180 MYA to X , X being the age limit of each isochrons.
I mean, I made maps showing the floor which age ranges from -180 MYA to
-154.3 MYA, -180 MYA to -147.7, -180 MYA to -139.6 and so on...

All the maps are here, in png format:
http://nachon.free.fr/MollweideCrustAge.zip


I used ImageJ from the NIH (http://rsb.info.nih.gov/ij/) and its plug-in
Area Calculator to calculate the surfaces in pixels.

I got 792854 pixels for the whole globe, 226615 pixels for the
continents which is exactly 28.6%, in agreement with values from the
litterature.

Moreover, I checked the surface of Australia as a test (11810 pixels) =>
7.60 millions km2. The surface of australia in the books is 7.68
millions km2. Less than 1.1% error. Not bad at all :-)


Then I plot the surfaces of oceanics floor for the different time range
vs time. The curve did not display an exponential growth as claimed by
Adams. Still, the growth was really smooth.

So I calculated the average growth rate for each isochrons and plot it
versus time:

http://nachon.free.fr/GrowthRate.pdf

It is linear in fonction of time.

(average rate of growth)=a.t+b

a=15.8±3.2 x10E3 km2/MYA
b=2.9±0.3 x10E6 km2
correl coeff: 0.970958

0.97, a very good correlation for average rates.

So dSurf/dt=a.t+b
it follows that
Surf(t)=a/2.t^2+b.t+c

If one consider d, the origin date of rate growth (Surf(d)=0) then
Surf(t) simplifies into:
Surf(t)=a/2*(t-d)^2

I used the surfaces of oceanic floor I calculated earlier, and fit the
equation. I found:

a: 15.403234 ± 0.567602 x10E3 km2/MYA2
d: -186.696232 ± 2.802151 MYA
correl coeff : 0.999689

Corellation is 0.999!!!! Terrific!

Look at this graph:
http://nachon.free.fr/Surface.pdf

A perfect hyperbola.

Such a perfect rate is completely unthinkable with Plate tectonics,
simply because continents are not symetrics...
Yep, it looks like PT is really dead.

So expansion of oceanic floors began 186.7±2.8 MYA ago and current
surface growth is about 2.9 km2/year. That is a radius growth about 18
mm/year.


For those who wants to make the calculations themselves, all the data
are here:
http://nachon.free.fr/data.pdf

Cheers :-)

--
Florian Nachon

"Tout est au mieux dans le meilleur des mondes possibles"
Voltaire vs Leibniz

Now that you've done this, take a trip all across the Pacific basin,
travelling to every country and island arc, particularly along the rim,
collect the needed stratigraphic, geomagnetic, and the petrographic data,
and then produce a map that shows that the above calculations have any
bearing on the reality on the ground.

Geore


.

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