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Author Topic:   continental drift
Minnemooseus
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Posts: 3945
From: Duluth, Minnesota, U.S. (West end of Lake Superior)
Joined: 11-11-2001
Member Rating: 10.0


Message 61 of 65 (544743)
01-28-2010 3:01 AM
Reply to: Message 56 by edge
01-27-2010 8:31 PM


Cretaceous seafloor spreading rates
This is shown by radiometric dating of the seafloor volcanic rocks which shows that during the Cretaceous Period, the Pacific Ocean opened at a faster rate than since then.
High seafloor spreading rates are deemed to be the primary cause of the seas transgressing onto the continents. The Cretaceous was the last great sea transgression.
In the past, I've unsuccessfully tried to find information documenting such spreading rates. Way back, TC (True Creation) posted some stuff that was sort of getting there.
Do you have a good (or even mediocre) on-line reference about such? Preferably one that doesn't require a subscription.
Moose

Professor, geology, Whatsamatta U
Evolution - Changes in the environment, caused by the interactions of the components of the environment.
"Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." - Bruce Graham
"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness." - John Kenneth Galbraith
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"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything." - Moose

This message is a reply to:
 Message 56 by edge, posted 01-27-2010 8:31 PM edge has replied

Replies to this message:
 Message 64 by edge, posted 01-28-2010 3:38 PM Minnemooseus has seen this message but not replied
 Message 65 by edge, posted 01-29-2010 12:41 PM Minnemooseus has seen this message but not replied

  
menes777
Member (Idle past 4340 days)
Posts: 36
From: Wichita, KS, USA
Joined: 01-25-2010


Message 62 of 65 (544793)
01-28-2010 12:49 PM


quote:
I make the figures just about spot on. Taking the distance between Norway and Greenland as the narrowest point between the plates, 60 million years since the rifting of Laurasia, and the figure of 2cm/year as the current measured rate of drift, I get that they should be about 2400 km apart. The true figure is 2200 km. That's a good fit of prediction to observation.
Just in case HN needed the figures to be sure... (Edit: N not M)
60,000,000 Years
2 Centimeters/year
120,000,000 Centimeters total
1,200,000 Meters (100 Centimeters in a Meter)
1,200 Kilometers (1,000 Meter in a Kilometer)
2,400 Kilometers (1,200 Kilometer x 2 sides of movement)
Also just a quick fact check and it appears to be spot on.
Edited by menes777, : No reason given.

  
menes777
Member (Idle past 4340 days)
Posts: 36
From: Wichita, KS, USA
Joined: 01-25-2010


Message 63 of 65 (544809)
01-28-2010 1:46 PM
Reply to: Message 52 by hawkes nightmare
01-27-2010 6:59 PM


quote:
...and that we were VERY close to the sun. those combined together make the earth uninhabitabe by ANYTHING up until 125 miles in space closer to the sun than our current position. now i'm too lazy to look anything more up so you'll have to do it yourself, and do the math. but i'm estimating that we were approximately where mercury currently is...
Two sites I have found show very different rates of the earth moving away from the sun.
15 CM
Why is the Earth moving away from the sun? | New Scientist
1.5 CM
http://curious.astro.cornell.edu/question.php?number=317
Let's use both though to be sure.
Ok if the earth formed 4.5 billion years ago and the earth is moving away at 15CM per year, here is what we get.
15 CM/year
4,500,000,000 years
67,500,000,000 CM total
675,000,000 M
675,000 KM
Ok if the earth formed 4.5 billion years ago and the earth is moving away at 1.5CM per year, here is what we get.
1.5 CM/year
4,500,000,000 years
6,750,000,000 CM total
67,500,000 M
67,500 KM
Yet evolution goes by life forming 1 billion years ago.
15 CM/year
1,000,000,000 years
15,000,000,000 CM total
150,000,000 M
150,000 KM
1.5 CM/year
1,000,000,000 years
1,500,000,000 CM total
15,000,000 M
15,000 KM
According to the following site the "Goldilocks zone", where water can exist in a liquid state is the following.
0.5 to 1.4 Astronmical Units
Source: Circumstellar habitable zone - Wikipedia
How much is an AU?
149,598,000 KM = 1 AU
So our "Goldilocks zone" is the following
74,799,000 KM to 209,437,200 KM
Ok so we put it together and as you can see even 4.5 Billion years ago Earth was still within the habitable zone in this solar system. Of course evolutionists don't claim life started that long ago so see the second figure. As you can tell it's not even breaking through the 149 Million Kilometer range.
4.5 Billion years
149,598,000 - 675,000 = 148,923,000 KM
1 Billion years
149,598,000 - 150,000 = 149,448,000 KM
So in other words, please check your work before presenting it as fact. No not even close to where Mercury is now (which orbits between 49 Million and 69 Million KM).

This message is a reply to:
 Message 52 by hawkes nightmare, posted 01-27-2010 6:59 PM hawkes nightmare has not replied

  
edge
Member (Idle past 1728 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 64 of 65 (544820)
01-28-2010 3:38 PM
Reply to: Message 61 by Minnemooseus
01-28-2010 3:01 AM


Re: Cretaceous seafloor spreading rates
High seafloor spreading rates are deemed to be the primary cause of the seas transgressing onto the continents. The Cretaceous was the last great sea transgression.
Mmm, yes. That's good consilience. I thought about getting into that, but it seemed a bit too much for our friend to bite off.
In the past, I've unsuccessfully tried to find information documenting such spreading rates. Way back, TC (True Creation) posted some stuff that was sort of getting there.
Do you have a good (or even mediocre) on-line reference about such? Preferably one that doesn't require a subscription.
I'll see if I can track some down. So much of what I post is from memory of class work many years ago. I'll check into it today if enough time becomes available. Maybe I can create some google strings that would be useful.

This message is a reply to:
 Message 61 by Minnemooseus, posted 01-28-2010 3:01 AM Minnemooseus has seen this message but not replied

  
edge
Member (Idle past 1728 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 65 of 65 (544914)
01-29-2010 12:41 PM
Reply to: Message 61 by Minnemooseus
01-28-2010 3:01 AM


Re: Cretaceous seafloor spreading rates
Do you have a good (or even mediocre) on-line reference about such? Preferably one that doesn't require a subscription.
Here is a reference that explains the reasoning. I haven't found anything with real data yet.
http://myweb.cwpost.liu.edu/vdivener/notes/cz_climate.htm

This message is a reply to:
 Message 61 by Minnemooseus, posted 01-28-2010 3:01 AM Minnemooseus has seen this message but not replied

  
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