Home Forums UPb Geochron DRS Cannot get accurate results using the UPb_commonapproach

This topic contains 2 replies, has 2 voices, and was last updated by  Dr Tephy Marillo-Sialer 1 month, 3 weeks ago.

  • Creator
    Topic
  • #10114

    Huiqing Huang
    Participant

    Hi there,

    I have a problem when I use UPb_commonapproach to reduce apatite U-Pb data. I used Madagascar apatite as the primary standard for downhole fractionation correction and NIST612 to do the 207Pb/206Pb correction. Everything looked normal, but I got Madagascar age of ~970 Ma, which is much older than its true age of 474 Ma. I have tried to use “observed slope” to do the 207Pb/206Pb correction. A somewhat younger age was returned (for Madagascar), but it was still not quite right.
    I have also tried with VisualAge_UcomPbine. No problem with this DRS.

    Does anyone know why UPb_commonapproach would return a wrong age for the primary standard?

    Cheers,
    Huiqing

Viewing 2 replies - 1 through 2 (of 2 total)
  • Author
    Replies
  • #10115

    Huiqing Huang
    Participant

    Is it because that Madagascar is homogeneous, so that only single value (instead of reference values) should be used?

    Huiqing

    #10464

    Hi Huiqing,

    Not really sure why you are getting wrong results. Would you mind sending us the experiment file, as well as the Madagascar standard file, to support@iolite-software.com so we can have a look?

    -Tephy

Viewing 2 replies - 1 through 2 (of 2 total)

You must be logged in to reply to this topic.