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The Role of Pyroxenites in the Volatile Budgets of Intraplate Magmas

Gibson S, Crosby J, Gleeson M & Jackson C

Gibson S, Crosby J, Gleeson M & Jackson C (2020) Goldschmidt Abstracts, 2020 824

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03d: Room 1, View in program

Sally Gibson
James Crosby
Matthew Gleeson
Charlotte Jackson

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 Marc Norman on
That was a really interesting presentation. I heard a brief mention of H2O/F fractionation but could you expand on this please? Just fyi, my current interest is in F-rich granites and their basaltic source regions rather then mantle geochemistry. Thank you once again. MN

Submitted by Sally A. Gibson on
Hi Marc, thanks for your perceptive question. In all of the mantle olivines and pyroxenes that we've now studied we see a decoupling of F and H2O. For clinopyroxenes this seems to reflect a different: (i) coupling behaviour in the crystal lattice (F with Ti, Fe3+, Cr3+ and H2O with Al) and (ii) partitioning behaviour of F and H during sub-solidus re-equilibration of opx and cpx. Some of this is explained in our recent GCA paper https://www.sciencedirect.com/science/article/abs/pii/S0016703720301289.

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