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Author Topic:   Assumptions involved in scientific dating
Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


Message 152 of 222 (827444)
01-25-2018 5:50 AM
Reply to: Message 151 by NoNukes
01-25-2018 1:32 AM


Re: his really stupid "Questions"
Or, for example the group known as Amphibolites are metamorphic and would contain a lot of different minerals recrystallising or not (therefore setting the clock back to zero at different depths and temperatures) at different times. It would thus be expected to find a wide variety of dates when trying to date Amphibolites. Just ask any geochronologist!
You do need to know something about rocks when trying to determine the age of rocks. Something a lot of people in the world seem to lack, yet think they know it all after reading a creationist piece.
Edited by Pressie, : No reason given.
Edited by Pressie, : No reason given.

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 Message 151 by NoNukes, posted 01-25-2018 1:32 AM NoNukes has seen this message but not replied

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


(1)
Message 186 of 222 (827638)
01-29-2018 6:31 AM
Reply to: Message 185 by DOCJ
01-29-2018 6:25 AM


Re: Questions and still no answers
This is a science thread. Genealogies of Thor really don't matter at all.

This message is a reply to:
 Message 185 by DOCJ, posted 01-29-2018 6:25 AM DOCJ has replied

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


Message 190 of 222 (827643)
01-29-2018 7:21 AM
Reply to: Message 189 by DOCJ
01-29-2018 6:49 AM


Re: Questions
Err, you'll have to work more than 65 hours a week and also have to show hundreds of thousands of specialists from all over the world; each working 40 to 65 + hours a week, too, that they all are wrong. Good luck!

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


Message 191 of 222 (827646)
01-29-2018 7:51 AM
Reply to: Message 189 by DOCJ
01-29-2018 6:49 AM


Re: Questions
DOCJ writes:
I have edited my posts for clarification. In some posts I erased a point in it but only because of clarification as I was not thinking just of radio carbon dating but all dating methods in my original responses.
FYI: If I have not responded to a point in any post, anyone can point it out as I have not read every post. I'll go back ASAP. I am at work 65+ hrs a week, and I have 40+ hrs of other obligations outside work so I will get to the posts asap.
So, you can't refute people who actually know something about even some of those methods of dating at all?

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


Message 204 of 222 (827700)
01-30-2018 4:31 AM
Reply to: Message 159 by DOCJ
01-27-2018 11:11 PM


Re: his really stupid "Questions"
DOCJ writes:
How do geologists calculate the amount of the parent/and daughter chemicals in the Rock at creation?
Geologists don't. So, not even going to try and read the rest of your incoherent diatribe.

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 Message 159 by DOCJ, posted 01-27-2018 11:11 PM DOCJ has replied

Replies to this message:
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 Message 214 by DOCJ, posted 01-31-2018 12:08 PM Pressie has not replied

  
Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


(2)
Message 206 of 222 (827705)
01-30-2018 7:31 AM
Reply to: Message 205 by RAZD
01-30-2018 7:00 AM


Re: his really stupid "Questions"
Of course. But some people don't realise that in metamorphic "rocks" different crystals form at different times, temperatures and pressures. You would expect lots of different ages in the same Amphiboles.
Edited by Pressie, : No reason given.

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


(2)
Message 211 of 222 (827735)
01-31-2018 6:15 AM
Reply to: Message 210 by JonF
01-30-2018 6:49 PM


Re: Questions
JonF writes:
I feel compelled to comment on knowing the initial isotopic state of the sample. Several modern methods do require that be known but the laws of physics give us the information we need. The most widely used is, of course, the aforementioned knowledge that zircons readily incorporate uranium and strongly reject lead so the initial P/U ratio is essentially zero.
I completely agree. However, creationists think that it is assumption. It isn’t.
The size of the Pb 2+ ions ensure that they can’t be incorporated into the tetrahedral crystal lattice of zircon (or the polymorphs of zircon). They are simply too big.
However, U2+ fit in nicely. So, at the formation of tetrahedric zircon crystals, we know that the Pb incorporated into the crystal lattice will essentially be zero.
Another Pb isotope, Pb6+, is not found in tetrahedral crystals for obvious reasons. They can't do tetrahedral crystals for the same obvious reasons. In chemistry the words "tetra" and "hexa" mean something...
It’s not an assumption. It’s basic chemistry.
Edited by Pressie, : No reason given.

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Pressie
Member
Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


(1)
Message 222 of 222 (827780)
02-01-2018 7:52 AM
Reply to: Message 220 by Taq
01-31-2018 4:55 PM


Re: his really stupid "Questions"
Coyote writes:
The fossil was also contaminated with modern carbon from shellac. Needless to say, this is just another example of creationists lying.
Actually, creationists found some samples with no measurable C14 at all, too. In their own "research". Point that out to Baumgardner and ask him to explain those zero-readings and then he vanishes in a poof of The Fluddy!
Edited by Pressie, : No reason given.

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