VizualAge UComPbine DRS and the Reference Materials data

Chengkaide

Hello everyone
I have some question about the VizualAge UComPbine DRS.

If I use VizualAge UComPbine DRS, the Reference materials data should include the radiogenic Pb ratio value or not?
Because Chew et al., 2014 mentioned "The values for the radiogenic and common Pb ratios are retrieved from the appropriate Iolite standard file".
But in MAD standard there is a “c207Pb/206Pb”, I want to know iolite will calculate the radiogenic Pb ratio from age or not?
Can I use any materials which have ID-TIMS ages, U-Pb measured ratios to be one standard like rutile?

Joe

If you're using UComPbine, your reference material file should contain the radiogenic U-(Th)-Pb ratios as well as whichever common Pb ratios are required depending on your settings. If you're using Stacey-Kramers composition, they need to have an "Age" defined. Otherwise, C207Pb/206Pb is needed for a 207Pb-based correction, and C206Pb/204Pb, C207Pb/204Pb, C208Pb/204Pb are needed for a 204Pb- or 208Pb-based correction.
The radiogenic composition should also be specified and will not be worked out from the specified age.
Yes, you can use any material for which you know the required information.
Yes, the 207/206 reference is to allow you to use a different material to calculate the 7/6 ratio.

All the best,

Chengkaide

What the meaning of the 207Pb/206Pb reference in VizualAge UComPbine?
It means we can use another materials to calculate the 207Pb/206Pb ratio? Like SRM 612.

tara_unicorn

Hi, I'm jumping on this thread as I am having an issue with this DRS... it keeps throwing up an error saying it could not find the common lead ratios for the reference material. I am using nist614 for the pb/pb correction and in the RM data file the common lead ratios are listed like this:
C207Pb/204Pb
C206Pb/204Pb
C208Pb/204Pb
I have tried restarting the program, trying to run it on a different session but nothing works. Am I missing something?

Thanks!

Bence

Hi Tara,

You can just list the common Pb ratios for the NIST614 glass without the "C" in front. However, the DRS will look for the "207Pb/206Pb" ratio in particular, so you'll need to add that.

Kind regards,
Bence