Register | Sign In


Understanding through Discussion


EvC Forum active members: 65 (9164 total)
2 online now:
Newest Member: ChatGPT
Post Volume: Total: 916,913 Year: 4,170/9,624 Month: 1,041/974 Week: 368/286 Day: 11/13 Hour: 0/0


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   Potassium Argon Dating doesnt work at all
edge
Member (Idle past 1736 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 105 of 133 (41404)
05-26-2003 4:15 PM
Reply to: Message 101 by Kyle Shockley
05-26-2003 4:01 PM


Addressing your edit...
quote:
I think that your latest example only confirms what I was trying to relay to you concerning the fallability of basing strict numbers upon fossil interpretations (as well as letting the fossils do the strata dating, as well as determining the known relative age).
This is a problem that I often see. Fossils allow us a relative dating method of some variable precision depending on the number and quality of fossils and the range of ages for a given fossil; but radiometric dating allows absolute knowledge of the age of a rock. After many years of work, the relative age scale is basically confirmed by absolute dating. This is confusing for laymen and I can understand why you do not accept it. However, you must expect firm responses when you make the types of assertions that you have made here. Unfortunately, we have heard this all before and it is really no challenge at all. Also, I suggest losing the K-Ar dating of recent lavas argument immediately. It undermines your credibility.

This message is a reply to:
 Message 101 by Kyle Shockley, posted 05-26-2003 4:01 PM Kyle Shockley has not replied

  
edge
Member (Idle past 1736 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 106 of 133 (41409)
05-26-2003 4:27 PM
Reply to: Message 104 by NosyNed
05-26-2003 4:14 PM


Re: Appeal to the Ref :-)
quote:
Edge,could you help a layman by translating a bit of that please?
Does time transgressive mean there is some "blur" in the boundary? What is Walther's Law? Thanks. Hang On I'll google it.
Ok, it says that different facies(types of rock) may overlap because of transgression and regression(water coming and going). But I don't see how that applies to something laid down all at once.
At any given time there is an lateral zonation of facies. For instance sand near the shoreline and shale in the basin. With time, the shoreline moves (transgression/regression) and the position of sand and shale change. Now imagine looking at the rocks and seeing a continuous shale unit through time. The problem is that the shale is of different age in different places and actually overlies the sand (for instance); and yet it looks like a big contemporaneous unit.
There are implications to this reasoning. One is that any two sequential units, unless separated by an unconfommity, will actually be contemporaneous at some points. THis is very confusing even to some geology students. But when looked at logically, it makes sense. It has to do with changing depositional environments over time.
Now, when we look at a fossil of short range, an index fossil, we will find that its horizon actually cuts across the rock units. This means that the fossil represents a time horizon that cuts across the depositional environments. There is a famous example in the Grand Canyon that I will look up when I have time.
Short duration events, such as an iridium event or a volcanic eruption will do the same thing. YOu can imagine all manner of complications.

This message is a reply to:
 Message 104 by NosyNed, posted 05-26-2003 4:14 PM NosyNed has not replied

  
edge
Member (Idle past 1736 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 124 of 133 (192826)
03-20-2005 3:09 PM
Reply to: Message 123 by arachnophilia
03-20-2005 3:27 AM


Re: Bump for RandyB
a much different date can usually be found several centimeters in any direction. these inconsistencies say nothing about the validity of the test.
has this been mentioned at all?
Perhaps not directly. What YECs, and many others not involved with dating, don't understand that there are a number of things that a date can mean. The first is that a date may be simply wrong. This happens in a number of ways, but the most common for YEC related literature is misapplication of technique. In other words, using K/Ar technique for a recent lava flow, or K/Ar techniques on a pyroxene separate. These don't make a lot of sense to a mainstream geochronologist, but I have heard of them being used by the mainstream as a last resort; in other words as a shot in the dark. In such a case, the results are viewed very skeptically and they probably are not often published. And for good reasons that even the YECs should agree upon, but instead they cry foul: the spurious results are witheld!
This is one of my pet peeves: YECs complain about the assumptions regarding radiometric dates that might invalidate data, and yet when we find that a sample violates these assumptions and reject the data they screech about a conspiracy to omit data. It's as if they are the only ones who understand the methodology. Oh, well.
A second reason for misunderstanding is that a date may mean something other than the actual formation of the rock. For instance, secondary alunite will yield a younger date than primary biotite. Is either number wrong? No, they simply date differenct events in the history of the rock.
A third and very important (but usually dismissed by YECs) issue is contamination. However, they think only of contamination in the sense that foreign material is introduced or some material is preferentiall lost in the preparation and analysis processes. They often take it as criticism of the laboratory which then means that the labs are undependable. Ah, don't we wish it was that easy! However, the real problem is that, often, rocks are composites of old and young rocks. An example with which you are familiar is the zenolith. Clearly a basement zenolith in a Tertiary granite will have a different date than the pure formm of the granite. This is why we are so careful in collecting samples and YECs are (intentionally?) more careless.
Then there is the contamination due to sampling and transmittal procedures. I remember reading about the Jurassic tree branch(?) that sat on someones shelf for a couple of years before dating the sample... NOT good procedure. And yet, there it is in the YEC literature.
Don't know if this stream of consciousness helps or not, but hopefully it raises the level of awareness of some of these issues. The point here being that, despite what YECs may think, a lot of thought and effort has gone into the development of radiometric dating techniques.

This message is a reply to:
 Message 123 by arachnophilia, posted 03-20-2005 3:27 AM arachnophilia has not replied

Replies to this message:
 Message 125 by Oleg, posted 01-14-2007 4:39 AM edge has replied

  
edge
Member (Idle past 1736 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 128 of 133 (377067)
01-14-2007 11:31 PM
Reply to: Message 125 by Oleg
01-14-2007 4:39 AM


Re: Bump for RandyB
You know, i may not be an expert in this field, and having read through some of the material, it is overwhelming at first.
Ah, let me guess: this won't stop you from critiquing the methods, right?
But, I must admit, one thing that is largely showing out of all of this: the assumption that certian rocks are "older" or "younger" than other of the rocks.
Yep, right out of the professional YEC talking points. Which website did you use to become so knowledgable about radiometric dating?
And what makes you think we can't tell which rocks are 'younger' or 'older'? This is some of the most basic stuff one learns in Geology.
One way out of the problem is to say that they're composite, and that mixed dates are to be expected. But, isn't this all assuming that content or context of a rock (or rocks) is the age that -we- as human beings say it is?
Ooops, you left out a critical step. After making such an hypothesis we look for evidence that it is so.
We don't know much of anything about past events that we never saw for ourselves;
Are you saying that anything we have not witnessed is uknowable? Are you saying that past events have left no mark in the geological record?
how then can we say one result is bad while another is good? Good or bad as in relation to who or what?
In relation to other data. No radiometric date lives in a complete information vacuum. We do know certain things about the rock or can infer it from previous work.
And, let us face this, ...
US?? Sorry, you're going to have to face this one yourself.
...if an entire establishment has a personal or professional of interest in saying that the earth's rocks are so many of millions of years old (and much of their grants and funding come from defending this paradigm), are they really going to admit (especially to those who say that the earth is of nowhere near millions of years old) that they have built their practice around faulty reasons for a very long time? or that they've had philosophic reasons for wanting the earth to be millions of years old?
So, you're saying it's a conspiracy? You're saying that virtually
ALL geoscientists are deceivers? You really believe this? If so, we have no grounds for future discussion.
You accuse "YEC's" (?) of being careless, of intentional falsifying of their works.
Well, it has been documented.
"Careless" can be a double-edged sword. so can the term "cherry picking" or "fudging".
How is that?
i saw enough of this on state sponsored projects of all varieties many years back, where numbers and charts were fudged a little or alot just to make something appear better than what it really was. sometimes by a little, sometimes by a lot, but always with a lie, and always in areas where the normal person had a hard time seeing what was going on.
And you never did anything about it? And you expect us to take your word here? As an admitted co-conspirator?
I wonder how much of house cleaning is needed in your own area, since you are all holding supreme in this area, and are making accusations that your critics are themselves liars?
As I said, let the facts speak for themselves. Want an example?
how many of the data are thrown out, or are contrary to what the paper reports in bold letters, because they are bad, not what you expect?
And just how do you know they have been thrown out? Which one of your favorite websites has told you this?
Let us be honest here; from what I read earlier,
Please document. What did you read and where did you read it? Please be honest now.
observed geologic events don't give dates that match with the actual event.
Examples please. We cannot address vague accusations.
How are we supposed to trust these dates when they are connected to events we never saw, either at the event, or the events leading to or after the isotopes were said to be closed in rock?
What dates? You have not given us any.
I live in the real world, have been around and seen how this sort of thing does its work in two opposite cultures.
Clearly, you know more about the dark side of science than I do. Where did you learn this?
As you say here: Money makes the world go round. And it's no different in science than it is in politics, no different for geologists or geochemists than it is for lawyers and laymen. Especially when personal or academic politics are mixed. If rocks are supposed to be "old" because books, groups, and your friends say so, then it is "old".
No. This is not always the case. You are talking about a cover-up of stupendous proportions. How long do you think something like that would last?
most people in areas like this don't even question their reasons,
I'm glad you are so knowledgable about scientists. Are you a psychologist?
because it is so accepted in their circles. Maybe this is why you accuse critics of being liars?
No, it is because we can document the occasions.
I will say for my part that I'd rather err on the side of being cautious regarding -any- interpretation of past events that we never saw for our own selves.
Or we could just avoid doint it at all. Or maybe next week, I'll tell my boss that I can't answer his question for another century or so. That'll work. Sorry, but I live in the real world, too.
Just because someone has a labcoat does not make them immune to the paradigms, peer pressures, or want of the numbers to "come out right" for own personal beliefs. Like I said, i've seen this all too many times in areas much more founded in real-world applied science -medicine, for instance. People are not robots; everyone believes in some kind of thing. and those who believe that a rock is "this" old or "that" old are no different.
Again, you don't think there is one honest scientist out there do you? Thanks for the vote of confidence.
and personally, my time hearing millions of years from many people have not sounded being very graceful.
Well, goodness, we wouldn't want that now, would we?
It reminds me of how engineers were treated when they said to others that things would not work for what the state was wanting, that the numbers weren;t coming out right, and that the reason for wanting big numbers in industry [geology included] was unrealistic and short of sight. They, the state, simply called them liars and wreckers and threw away their critics. Of course, the engineers and their criticisms turned out to be right in the end....
I thought you said there were all these conspiracies to cover up the truth.
Also, please document. You give us a little anecdote without any specifics and how are we supposed to address it? Escpecially when it isn't about scientist covering anything up???

This message is a reply to:
 Message 125 by Oleg, posted 01-14-2007 4:39 AM Oleg has replied

Replies to this message:
 Message 129 by Oleg, posted 01-15-2007 5:46 PM edge has replied

  
edge
Member (Idle past 1736 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 133 of 133 (377679)
01-17-2007 10:43 PM
Reply to: Message 129 by Oleg
01-15-2007 5:46 PM


Re: Bump for RandyB
Past events leave evidence, true; and we can interpret that evidence based on paradigm we chose, correct.... But, simple fact is that we construct paradigms to interpret evidence; the evidence does not speak for itself. If amount of much argon in sample is interpreted as result of decay, then I will read it as being millions of years old; if inclusion is what I see, then it will read something else. We can interpret something as inclusion, and we can make best guesses as to when and where things happen; but the bottom line is that we have man-made constructed ideas which to frame this together.
And the problem is? Are you saying that all pardigms are wrong? Are you saying that YECs do not use paradigms? I don't get your point. HOwever, I see this as a very simple solution for you. Show that the paradigms in use are incorrect. Why has this not been done?
You say:
"'Samples less than 5 M.Y. old, or containing less than 0.1%K will incur a 50% surcharge, reflecting the special care and additional analyses required. We cannot analyze samples expected to be younger than 2 M.Y.' The reasons for this warning are very simple. You need to have sufficient potassium in the sample to make the potassium-argon method work,..”
Sufficient is fine; but potassium is not question, it is argon content in example given.
Incorrect. If there is little potassium to generate argon, then the result is difficulty in separating the signal from the background. So, low [K]rocks are not ideal samples for K/Ar dating. It is all very simple. See the quote from Joe Meert in RAZD's post below.
Here is assumption and problem. How does one know that measurable amounts of argon (which there was in Austin example) are due to “slow decay” that you state?
This data is not generated in a vacuum. We know certain things about the rocks beforehand. For instance, I know that a tholeitic basalt has pyroxene which is a known bad-actor because of argon retention. On the other hand microcline or adularia are better because there is no track record of them being significantly argon retaining; and at the same time they have high [K], so that the signal to noise ration is much higher.
There isn’t any way to know, you assume it by super powers of magic eyesight, apparently.
No, we have experience.
you have to yell ...
Who's yelling?
...about how inclusion from old rock was made in sample (even though you assume this, you were not there), and call researcher a liar.
Well, don't know about any particular case, but in some cases it has been documented and in one case, I believe Austin has admitted to the presence of zenoliths. He also provides rock descriptions that are a bit sketchy, suggesting poor technique.
What I find strange: You are angry at me...
Who's angry? I'm beginning to think you are projecting here...
... for saying that your side does so, even when evidence given here seems to agree with that in this example. So, example given shows that sample had argon when content was supposed to be nothing.
And who said that it was supposed to be nothing? A YEC?
All you can do is call research a lie. Sounds very much of faithful want from you, agreed?
No entiendo. What are you saying? Yes some research is flawed and when it is to the advantage of the researched for it to be flawed, you should be skeptical.

This message is a reply to:
 Message 129 by Oleg, posted 01-15-2007 5:46 PM Oleg has not replied

  
Newer Topic | Older Topic
Jump to:


Copyright 2001-2023 by EvC Forum, All Rights Reserved

™ Version 4.2
Innovative software from Qwixotic © 2024