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Abstract Details

(2020) Petrochronology and Thermochronology of Apatite

Chew D, Spikings R, Mark C, O'Sullivan G, Henrichs I & Ansberque C


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04h: Room 1, View in program

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Thomas Zack on
Do you control on the amount of common Pb (via 204Pb) from core to rim in your apatites? In micas, we repeatedly see an increase in common Sr towards the rim- some sort of in-diffusion. I would be interested to know 1) just to see if it is a common feature and 2) as it may influence your age calculations if the fluid (I suppose some sort of fluid would be required) has variable Pb isotope composition, like release from other radiogenic phases.

Submitted by Renee Tamblyn on
Hi Dave, excellent talk. Do you thinking resigning all low grade apatite to be low U and therefore undatable is realistic? In some low-grade pelitic rocks (with perhaps low Fe3+) apatite can form in the absence of epidote or even allanite, potentially allowing it to take in U. Do you think it is worth exploring more low-grade terranes to investigate the full potential of apatite U-Pb?

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