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Abstract Details

(2020) Trace Element Mapping in Pyrite Framboids by Atom Probe Tomography

Atienza N, Gregory D, Taylor S, Perea D, Owens J & Lyons T

https://doi.org/10.46427/gold2020.90

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06l: Room 2, 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 Daniel Gregory on
Can you explain why the Ni, Cu, and As seem to co-vary? Is there a reason why these trace elements seem to group together?
Hi Dan, thank you for your question! Trace elements can influence the uptake of other trace elements and in my case, Ni, Cu, and As influence each other. It is possible when As 3+ substitutes into Fe 4+, there is a charge imbalance that Ni 1+ and/ or Cu 1+ satisfies therefore, As, Ni, and Cu seem to exist in the same "area" in the microtips. This is my theory for now as I have to look through previous studies again to verify, but it is possible. Thank you again!

Submitted by Jennifer Morford on
Fascinating talk! I am curious about the analysis. Do you have a sense for how representative your samples were for the overall sample or whether there were framboids with multiple overgrowths?
Hi Jennifer, thank you for your kind words! As for the possibility of other framboids with multiple overgrowths, that will be hard for me to answer because I was not able to look for other framboids in the sample. Dan Gregory, my supervisor, may be able to answer that as he had examined these samples before. As for the sense of how representative my samples are, I can't say with 100% confidence that my analysis is representative as I only examined one to two framboids but there is some confidence that the trace element content of other framboids will be similar. These framboids formed in the water column therefore, the geochemistry of the ocean at the time should be present in most of the framboids in my samples. Thank you for a great question!

Submitted by Jennifer Morford on
Fascinating talk! I am curious about the analysis. Do you have a sense for how representative your samples were for the overall sample or whether there were framboids with multiple overgrowths?
Hi Jennifer, thank you for your kind words! As for the possibility of other framboids with multiple overgrowths, that will be hard for me to answer because I was not able to look for other framboids in the sample. Dan Gregory, my supervisor, may be able to answer that as he had examined these samples before. As for the sense of how representative my samples are, I can't say with 100% confidence that my analysis is representative as I only examined one to two framboids but there is some confidence that the trace element content of other framboids will be similar. These framboids formed in the water column therefore, the geochemistry of the ocean at the time should be present in most of the framboids in my samples. Thank you for a great question!

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