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(2020) Probing the Evolution of the Lower Crust with Trace Element Geochemistry and U-Pb Geochronology of Lower Crustal Xenoliths from Queensland, Australia

Emo R, Deegan B, Murphy D, Allen C & Kamber B


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04h: Room 1, Friday 26th June 07:06 - 07:09

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 David Chew on Thursday 25th June 13:47
Rob, are you surprised the titanite records such old (and fairly coherent) ages, given the hotspot seems to have significantly affected the lower crust in the region?

Submitted by Thomas Zack on Thursday 25th June 17:11
Congratulations Emo, you have the results I was looking for quite a while now: a texturally old rutile with an age of 1.6 Ma overgrown by a clearly young titanite with an age of 207 Ma. Brilliant! It may sound trivial to you, but you cannot believe how much one can scratch his/her head to figure out if something is driven by volume diffusion or reaction driven. THIS is clearly diffusion-driven! If you could redraw your BSE image of the rutile and the titanite from H32-3, by including those rutile and titanite ages, it would be fun to show during the Q&A session. As a convenor, I am very hesitant to play too much with the software, but in this case it would be worth trying.

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