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Freethought & Rationalism ArchiveThe archives are read only. |
07-02-2002, 05:58 PM
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#1 |
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Cooling Rates of Plutons
Though it sound intutively wrong, I am not the person to formally debunk AiG's claim that Plutons can cool fast as opposed to millions of years:
<a href="http://www.answersingenesis.org/docs/3970.asp" target="_blank">http://www.answersingenesis.org/docs/3970.asp</a> I do have a few ideas: fissures that release the heat of a mass many cubic kilometers in volume? I don't think so since I suspect we have a volume/surface area problem. Also that conventional cooler rates are consistent with the radiometic dating as documented <a href="http://baby.indstate.edu/gga/pmag/paleosol.htm" target="_blank">here</a>. Patrick? Anyone? This one could make a great proposal for a T.O. FAQ. |
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07-02-2002, 07:00 PM
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#2 |
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Not one for me either.
[ July 03, 2002: Message edited by: Dr.GH ]</p> |
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07-02-2002, 07:11 PM
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#3 |
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They might have a case for "Plutons could cool faster" but certainly not that "all plutons did cool faster".
It looks like there are telltale signs that show the rate of pluton cooling. <a href="http://www.gi.alaska.edu/TSRG/Research/TSRG14.html" target="_blank">http://www.gi.alaska.edu/TSRG/Research/TSRG14.html</a> |
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07-03-2002, 01:05 PM
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#4 | |
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Quote:
<a href="http://iidb.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=58&t=000258&p=" target="_blank">this old thread from february.</a> Look towards the bottom of the page. Kevin Henke has a nice article adressing this issue. See <a href="http://www.geocities.com/Athens/Thebes/7755/henke/krh-coolmagma.html" target="_blank">Cooling Magmas: More Distortions from Snelling and Woodmorappe. </a> Finally, the *actual* rate at which magmas composing large plutons cooled can be deduced by dating different minerals with different closure temperatures, as the pages cited by LV and Notto show. Another example of such "thermochronometry" is cited on <a href="http://iidb.org/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=58&t=000258&p=" target="_blank">the old thread from february.</a> Patrick [ July 03, 2002: Message edited by: ps418 ]</p> |
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07-03-2002, 01:17 PM
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#5 |
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This Snelling guy - has anyone read his thesis? Did he suggest the uranium deposits were a few thousand years old?
I'm curious if he genuinely doesn't understand how geochronology works and what techniques are available, or if he focuses on demolishing straw man K-Ar studies to deceive the gullible. If the latter, how does that square with 'thou shalt not bear false witness'? |
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07-03-2002, 02:32 PM
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#6 |
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You might find it interesting to read about <a href="http://home.austarnet.com.au/stear/snelling.htm" target="_blank">Dr. Andrew Snelling</a>; he gives new meaning to the term "two-faced".
And on the formation of plutons, the slow part is their cooling, which happens by heat diffusion, which takes place on timescales that scale as (distance scale)^2. Thus, one might try extrapolating from one's coffee mug to a 10-km pluton. 10 minutes over 10-cm thickness becomes 200 thoussand years over 10-km thickness. Fast by geological standards, but too slow for young-earthers. |
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