rmwilliamsll
avid reader
i dont' know anything about these He claims so i'll do a little digging.
first to AiG
http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
http://www.christianforums.com/showpost.php?p=22999946&postcount=479
comes from, a difficulty since no links given for the contentions, but that's ok. there is always google.
so it looks like this is what needs to be researched
so go to my local university library:
Author Chamberlain, Joseph W. (Joseph Wyan), 1928-
Title Theory of planetary atmospheres : an introduction to their physics and chemistry
LOCATION CALL NO. STATUS
Science-Engineering Library QB603.A85 C48 1987 DUE 07-22-06
and
Your entry Vardiman, Larry would be here
so he is not listed in the library.
nor is: Malcolm, David
so those are unobtainable, for now.
now to who links to:
http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
3 other pages at AiG so it is not an in demand scientific paper
link:http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
lets look for rebuttals directed at:
helium concentration AiG
Young-Earth Creationist Helium Diffusion "Dates"
Fallacies Based on Bad Assumptions and Questionable Data
by Kevin R. Henke, Ph.D.
at: http://www.talkorigins.org/faqs/helium/zircons.html
not really the same topic, move on.
particularly helpful is another exchange on the topic in a forum like this one.
pointers and links into the literature.
from: http://www.bautforum.com/archive/index.php/t-1731.html
from: http://www.grisda.org/origins/25055.htm
so to understand the issues i have to concentrate on the escape of He and the rate of diffusion from the rocks
back to reading on the topic.
my immediate question is: did the poster of the original helium problem actually do all of this before he posted the link? that is, do YECist understand the science to which they refer?
good question.
first to AiG
http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
this has promise for where the details ofThis is an unsolved problem to the long-age atmospheric physicist C.G. Walker, who stated: ‘… there appears to be a problem with the helium budget of the atmosphere.’6 Another expert, J.W. Chamberlain, said that this helium accumulation problem ‘… will not go away, and it is unsolved.’7 The evolutionary community have been desperately looking for other explanations for the shortage, but none of them have proved adequate. A simple solution is that the earth is not nearly as old as the evolutionists think! The creationist atmospheric scientist Larry Vardiman has written a more in-depth study of this topic.8, 9
http://www.christianforums.com/showpost.php?p=22999946&postcount=479
comes from, a difficulty since no links given for the contentions, but that's ok. there is always google.
so it looks like this is what needs to be researched
# J.W. Chamberlain and D.M. Hunten, Theory of Planetary Atmospheres, 2nd Ed., Academic Press, 1987. Cited by Vardiman, Ref. 8, p. 30. Return to text.
# The most comprehensive work on this topic is Dr Larry Vardiman’s book: The Age of the Earth’s Atmosphere: A Study of the Helium Flux through the Atmosphere, Institute for Creation Research, 1990. See also his article Up, Up, and Away! The Helium Escape Problem, ICR Impact , 1985. Return to text.
# David Malcolm provided more detailed calculations than in this article: Helium in the Earth’s Atmosphere (Answering the Critics), Creation Ex Nihilo Technical Journal 8(2):142–147, 1994. Return to text.
so go to my local university library:
Author Chamberlain, Joseph W. (Joseph Wyan), 1928-
Title Theory of planetary atmospheres : an introduction to their physics and chemistry
LOCATION CALL NO. STATUS
Science-Engineering Library QB603.A85 C48 1987 DUE 07-22-06
and
Your entry Vardiman, Larry would be here
so he is not listed in the library.
nor is: Malcolm, David
so those are unobtainable, for now.
now to who links to:
http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
3 other pages at AiG so it is not an in demand scientific paper
link:http://www.answersingenesis.org/creation/v20/i3/old_earth.asp
lets look for rebuttals directed at:
helium concentration AiG
Young-Earth Creationist Helium Diffusion "Dates"
Fallacies Based on Bad Assumptions and Questionable Data
by Kevin R. Henke, Ph.D.
at: http://www.talkorigins.org/faqs/helium/zircons.html
not really the same topic, move on.
particularly helpful is another exchange on the topic in a forum like this one.
pointers and links into the literature.
from: http://www.bautforum.com/archive/index.php/t-1731.html
Dr. Larry Vardiman's 1990 book "The Age of the Earth's Atmosphere" is the most recent survey of the helium problem.
The atmosphere now contains about 4.1 billion
tons of He-4. It is estimated that about 2400 tons per year He-4 is released from the crust into the atmosphere. The theoretically calculated rate of escape of He-4 from the atmosphere into space averaged over an eleven-year solar cycle is only about 70 tons per year. This is only 1/33rd of the rate of inflow from the crust. If we assume a zero content of He-4 in the original atmosphere, the maximum age of our
atmosphere calculated from these figures is only about 1.8 million years. The atmosphere of an earth 4.5 billion years old should contain 2,500 times more helium-4 than it does. Joseph Chamberlain and Donald Hunten at the close of a detailed examination of atmospheric helium concluded, "The problem will not go away and it is unsolved. Vardiman discusses three possible solutions for the missing helium problem. He shows that
these solutions have not yet made the helium problem go away. Atmospheric helium clock continues to report a young age for the earth.
Prince: Dr. Larry Vardiman's 1990 book "The Age of the Earth's Atmosphere" is the most recent survey of the helium problem.
Vardiman, in true creationist fashion, always assumes that any problem which does not already have a known solution, cannot ever be solved. Hence the illogical retreat to creationism.
Like I said, Vardiman glosses over the nonthermal escape of helium, and assumes that some dire passage from Chamberlain's 1978 text book on atmospheres is the eternal last word.
Vardiman was & is wrong. We now know that nonthermal escape mechanisms balance helium added to Earth's atmosphere by outgassing.
Helium escape from the terrestrial atmosphere: The ion outflow mechanism
O. Liesvendsen & M.H. Rees
Journal of Geophysical Research - Space Physics 101(A2): 2435-2443, February 1, 1996
ABSTRACT: We have computed global He+ escape fluxes for a range and a variety of diurnal, seasonal, universal time, and solar activity geophysical conditions. We average over the short-term variables and compute the globally averaged escape flux for a range of cutoff latitudes, which separate regions of open and closed field lines, during one solar cycle. The global escape flux averaged over a solar cycle was computed, and we find that a cutoff latitude of about 60 degrees or lower is sufficient to balance the outgassing from the Earth's crust.
Despite the misplaced confidence of Prince the "helium problem" is just another of the many pleasant fictions that creationists weave to while away the time.
Prince: Wrt radiogenic helium trapped in very hot rocks deep in the crust, whose rate of escape and diffusion upward is greatly increased at high temperatures: ...
Prince's first mistake, simply assuming without reason that the diffusion rate must be high enough to drive all of the primordial helium out, just because the temperature is "high". This is far from the truth. In reality, ost of the helium is trapped and hard to mobilize. The temperature is of little account, since diffusion is dominated by partial pressure. The helium only moves if the partial pressure in the direction of motion allows it. There is in fact no reason to believe that helium should escape so rapidly.
But the comment shows that Prince is unaware of the real problem. He says "yet much of the helium-4 produced in them has not escaped ...". Dead wrong, much of it, in fact most of it, has escaped. The real problem with Earth's mantle is not that there is too much helium, but too little helium.
The 3He/4He ratio is strongly skewed in the mantle, at a minimum of several times the atmospheric ratio. 3He is non-radiogenic, meaning that all of the 3He inside Earth must have been put there when the planet formed. But if Earth experienced nothing but a "normal" outgassing history, the ratio of 3He/4He should be much smaller than it is (there should be more 4He with respect to 3He).
The answer is that the outgassing rate is not constant, but quite variable. Outgassing was furious during planet formation, and during the the heavy bombardment phase of the early solar system. That outgassing model fits very nicely with the current observed outgassing rate.
Cosmic helium does not rain down on Earth. All of the helium in the solar wind (about 5% of the solar wind) is ionized & deflected by Earth's magnetic field. Helium generated by cosmic rays in Earth's crust is practically non-existent, a miniscule fraction of the helium produced by radioactive decay in the mantle. So two of Prince's sources are wrong. The earth's atmosphere gains helium exclusively by outgassing from the mantle.
The half life of the 238U decay chain is 4.468 billion years, and the half life of the 232Th decay chain is 14.010 billion years. This means that there are long term sources of 4He in Earth's mantle.
I already showed that the loss rate of ionized helium from the polar regions balances the observed rate of outgassing, so the system is in equilibrium. It may have been that way for a long time or a short time, but the fasct that it is in equilibrium is simply not a problem for any evolutionary model of an "old earth". Furthermore, ougassing models based on evolutionary histories for Earth do reproduce the current observed abundances, outgassing rates, and isotopic ratios (Noble gases in the Earth's Mantle, Farley & Naroda, Annual Review of Earth and Planetary Sciences 26: 189-218, 1998; Rheology and Volatile Exchange in the Framework of Planetary Evolution, Franck & Bounama, Advances in Space Research 15(10): 79-86, 1995).
Summary: The current loss rate from the upper atmosphere is in equilibrium with mantle outgassing, contrary to Vardiman's claim. The current abundance of helium in the mantle is not too large, contrary to Prince's claim. The Earth's atmosphere receives helium only from mantle outgassing, contrary to Prince's claim. The expected diffusion rate of helium in the mantle is not as high as Prince thinks, which means that he seriously overestimates the outgassing rate. The skewed isotopic abundance (3He/4He) indicates that either the mantle or the atmosphere (probably the latter) is not primordial, but has been processed. The net result is that there is no "helium problem" for evolution with respect to creationism.
Helium
caryn: Brown giving an updated Creationist view on Helium ... (Unique Enigmatic Helium (http://www.grisda.org/origins/25055.htm))
At first glance I thought maybe it was the infamous Walter Brown, but it is R.H. Brown from the creationist think tank Geoscience Research Institute[/utl].
It is an interesting paper, certainly a cut above the usual brain-dead creationist fare. But for all the technical window dressing, the whole argument boils down to this: What is the real diffusion rate of helium in the mantle?
"Evolutionists", like Ken Farley (http://www.grisda.org/), who is cited & quoted in Brown's paper, don't buy the argument that the diffusion in the mantle should match the diffusion seen in the lab. Brown & creationists, on the other hand, think the two should match.
It would not be the first time that an idealized laboratory experiment failed to reproduce the complications of a real, natural system. The laboratory experiments all feature a rock or diamond or some such, sitting there & outgassing, into a low pressure environment, across a surface (the surface of the rock) that is a sharp discontinuity. However, it isn't like that in the mantle. There, you won't find that kind of discontinuous surface, and the pressure is far higher. Also the composition & density are much different. There is in fact no good reason to assume that diffusion rates in an environment that does not well match the target environment, should still match that target environment (in this case, the mantle).
So you find that all of the paper is built as a house of cards around a single sentence: "A simpler, more reasonable conclusion is that conventional geological age dating is
incorrect ...". I maintain that it is neither simpler nor more reasonable.
You can't take the issue of helium, and separate it from all otehr science, as if the rest of science didn't exist, and then assume blindly a "young" earth. That is a highly unreasonable approach. There is copious evidence in favor of an "old" earth, so much so that it is unreasonable under any circumstance to make an assumption of a "young" earth.
It is in fact, simpler & more reasonable, to accept the bulk of strong evidence in favor of an "old" earth, and then question under what circumstances the data can be so interpreted, and whether or not the interpretation makes physical sense. If you do that, and are unable to come up with anything, only then is it reasonable to expand your question to the age of the earth.
There are in fact good physical reasons for assuming that the in situ transport of helium will not match the laboratoey version, because the environments are so different. In the dense mantle helium can be trapped & immobilized for long periods of time, such as cannot happen in the crust. Furthermore, the lack of a paritial pressure gradient across the sharp boundary of a surface will inhibit transport in the mantle, where it would go easily near the surface. And how well do we really know the real abundances of radiogenic sources for helium in the mantle. If we underestimate (or overestimate) the production rate by 1%, 5%, 10%, how does that affect the argument?
In isolation the helium in the mantle presents a problem, one that is readily acknowledged in the literature. However, there are so many parameters of the problem to study, which can alter the results by purely ordinary physics, that going to the extreme of immediately calling into question the age of the earth is unreasonable.
from: http://www.grisda.org/origins/25055.htm
UNIQUE ENIGMATIC HELIUM
R. H. Brown
Yucaipa, California
Origins 25(2):55-73 (1998).
WHAT THIS ARTICLE IS ABOUT
Among the 92 elements from hydrogen to uranium, helium is unique in not having a universally characteristic isotope ratio. Various mixtures of helium from three primary sources produce He-3/He-4 ratios over a six orders-of-magnitude range. The primary sources are: primordial, radiogenic, and cosmogenic. The concentrations of He-3 in many minerals, sediments, and volcanic provinces indicate that conventional geologic age assignments are grossly inflated, since these concentrations are orders-of-magnitude greater than may be expected on the basis of laboratory measurement of diffusion rates.
Attempts to account for the He-4 in Earth's atmosphere on the basis of diffusion of radiogenic helium from the crust and thermal loss to outer space yield unreasonable models. This consideration, and observations concerning nonthermal escape processes first made during the 1970s, have led to the conclusion that helium escape from Earth is largely by nonthermal processes. Of the seven such processes that have been identified, the greatest loss appears to be in a polar "wind" of ions accelerated along open lines of magnetic field in the regions surrounding Earth's magnetic poles.
so to understand the issues i have to concentrate on the escape of He and the rate of diffusion from the rocks
back to reading on the topic.
my immediate question is: did the poster of the original helium problem actually do all of this before he posted the link? that is, do YECist understand the science to which they refer?
good question.
Upvote
0