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

This topic contains 1 reply, has 1 voice, and was last updated by  Huiqing Huang 6 days, 6 hours ago.

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  • #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

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  • #10115

    Huiqing Huang
    Participant

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

    Huiqing

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