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Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
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Author | Topic: Mid-ocean Ridges and Age of Formation | |||||||||||||||||||||||||||||||||||||||
RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined:
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I may not be the best source to initiate this, as my knowledge of geology is weak.
That said I come to this topic as a side issue from Geology and the Great Flood, Why the Flood Never Happened, Message 290 where Faith is asking questions about Tectonics. It occurs to me that a basic discussion of the mid-ocean ridges would help in
It occurs to me that these ridge patterns are like tree rings and varves ... Mid-ocean ridge - Wikipedia
The mechanism behind Plate Tectonics
quote: Presumably the ridges are date-able by radiometric means, and there should be a number of different techniques to use so they can be checked for consilient dates. Enjoy Edited by RAZD, : image addedby our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Just a quick search gets me these two articles
(1) Steven J. Goldstein, Michael T. Murrell, Ross W. Williams, 231Pa and230Th chronology of mid-ocean ridge basalts, Earth and Planetary Science Letters, Volume 115, Issues 1—4, March 1993, Pages 151—159, Error: DOI Not Found(93)90219-Y
quote: and (2) R. A. Duncan, L. G. Hogan, Radiometric dating of young MORB using the 40Ar-39Ar incremental heating method, Geophysical Research Letters, Volume 21, Issue 18, pages 1927—1930, 1 September 1994, Article first published online: 7 DEC 2012, DOI: 10.1029/94GL01375 Just a moment...
quote: Seems to be more about method than results. MORB is mid ocean ridge basalt. Enjoy. Edited by RAZD, : ..by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
From NOAA
Mid-Ocean Ridge Activity
quote: Looks like the ocean floor age varies from 0 at the ridges to 180 million years at the furthest subduction zone. This map is similar: http://geology.about.com/...cmaps/ss/World-Seafloor-Ages.htm
quote: The oldest shown here is ~280 million years between Africa and Italy/Greece/Turkey. Enjoyby our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Probably because the Mediterranean sea is so protected from the rest of the ocean formation? More likely that it is the last remnant of ocean floor being pushed under as the gap between narrows.
Everywhere else has newer stuff being created and eventually flowing overtop... but here, it is sort of "locked off" and doesn't get backfilled. The floors are part of the plates moving away from the ridge, which causes the crack for new stuff to well up, solidify and start traveling with one or the other plate. The further away the older they are, having moved away from the center gap in the intervening years. Mid-ocean ridge - Wikipedia
Something like that? Not quite ... by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
... This created volcanoes that built the mounts, and that died as the plate moved further away. ... And they should have recorded the magnetic field orientation that was current at that time, so should correlate with bottom age and magnetic field. Can you imagine all those magnetic field inversions occurring in a YEC model world? Enjoy.by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Associated with plate tectonics are the many chains of islands and underwater mountains, formed as the plates moved over a hot spot of magma. This created volcanoes that built the mounts, and that died as the plate moved further away. The Hawaiian-Emperor chain is the best known one. Most of these show a linear increase in radiometric age as you move away from the hot spot, consistent with currently observed rates of movement of the plates, thus being a check on the accuracy of RM dating. And I was able to find this http://www.geog.fu-berlin.de/...KIV/hawaii/introduction.html
quote: Doesn't appear to include a magnetic reversal. Against that "standard" Hawaii Island theory is this: The Emperor and Hawaiian chains
quote: It seems that there is some dispute here, and that magnetic alignment with ridge spreading lines of magnetic orientations is part of the discussion. Enjoyby our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined:
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If you mean 100 BC for 11 feet per day and it is not a misprint, this is still a 10,000 fold increase in rate of movement with its attendant quakes AND do not forget the vulcanism. Krakatoa cooled the earth for months due to its dust. You need maybe thousands of Krakatoas a year for centuries. The Romans probably would have noticed. ... And all of this fantasy fast movement would leave the Mid-Ocean Ridge gap open more, the rock in the ridges would still be cooling and all the heat that would have been dispersed over hundreds of years would be concentrated into a few days. The water would boil over the ridges, filling the air with steam in addition to all that dust, and the sun would not be visible for many many years -- something even ol Noah would notice. There would be many years of climate change that just is not recorded ... To say nothing about all those magnetic reversals flipping the magnetic field all over the place and affecting it's ability to protect the earth from radiation from the sun ... also not recorded ... Enjoy Edited by RAZD, : ...by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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RAZD Member (Idle past 1406 days) Posts: 20714 From: the other end of the sidewalk Joined:
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I don't understand how anyone can get miles a day out of the simple problem of three thousand miles of distance covered in 4300 years. Which doesn't account for all the other movements of the plates http://pubs.usgs.gov/gip/dynamic/understanding.html
quote: The divergent boundaries are the mid-ocean ridges and the rift valley in Africa.
quote: 2.5 cm is 1 inch. per year.
quote: So the movement you calculated relates to the slow end of the rates of motion, and the fastest is 6 times faster (6 inches per year).
quote: Thus there is a wide range of information about time and rates of movement that are consistent around the world. This includes age of formation of the rock and ages of magnetic reversals.
Etewitness acciounts are certainly a lot more reliable than conjurings about the past from the present could possibly be. If he was there and died of the heat then we'd know he was right about the heaty. And that is probably a good reason why trained observers who are knowledgeable about geology and physics end up with results that are certainly a lot more reliable than your conjurings about the past based on fantasy.
Message 37: ... No, there has to have been a cooling factor you aren't taking into account. ... That is you hoping for a miracle again ... as you do for every piece of contrary evidence that is so inconvenient for your fantasy. Now you want thermodynamics to change on your whim. If you change the thermodynamics so that water doesn't boil then you change the thermodynamics of everything else ... fresh water lakes and rivers would freeze solid by the same process of miraculous heat removal. Hilarious. Enjoyby our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click)
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