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Author Topic:   Dating Question For Members
Member (Idle past 1682 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002

Message 73 of 77 (630081)
08-22-2011 10:36 AM
Reply to: Message 72 by someone
08-22-2011 12:31 AM

Re: Related Dating Questions
I have on idea if it has a separate name since most magma would have it. That being said diffusion would be a huge problem so you could only date young magma or see which crystals are least affect. But hey its a moot point unless you can go sample a piece of magma.
To be a bit more precise here. Radiometric ages give us cooling ages, and not solidification ages. A given mineral has a 'trapping' temperature above which daughter elements are mobile, even in the solid state. Most of those temperatures would be below the temperature that the rock is solid (called the 'solidus'). Hence each mineral would give a different age based on its trapping temperature and its cooling history.
This, of course, would confuse YECs...
There are ways around this mineral issue based on isochron dating and whole rock methods, but it has been very long since I studied them and I'm too lazy to look up the information. I think that RAZD has it handy.

This message is a reply to:
 Message 72 by someone, posted 08-22-2011 12:31 AM someone has replied

Replies to this message:
 Message 74 by JonF, posted 08-22-2011 12:49 PM edge has not replied
 Message 75 by someone, posted 09-14-2011 1:30 AM edge has not replied

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