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Abstract Details

(2020) A Geochemical and Textural Cross-Section of a Compositionally Zoned Magma Reservoir

Zayac J & Longpré M-A

https://doi.org/10.46427/gold2020.3072

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05i: Plenary Hall, Thursday 25th June 06:48 - 06:51

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 Michael Rowe on Wednesday 24th June 05:58
Clear and concise presentation! You've presented phenocryst proportions but don't quantify groundmass crystallinity. I'm particularly interested in how the groundmass crystallinity varies as a function of volatile loss (phenocryst - groundmass), and how much of your groundmass glass chemical variation is dictated by late stage groundmass crystallization rather than an actual change in bulk liquid composition (residual glass between crystals as opposed to a mostly glass material).
Thanks for the encouragement and the great question - one I'll be sure to keep in mind as I am preparing this manuscript. I am currently working on quantifying the groundmass crystallinity across the eruption. In general, if microlite crystallization controlled the compositional gradient, one would expect a positive correlation between SiO2 and microlite content, which we see the opposite of. We have also measured the bulk rock chemistry of both the dacite and the andesite end-members for this eruption (and four others). As expected, the microlite poor dacite has less variation between bulk rock and glass chemistry than the microlith-rich andesite, but the compositional gap between the early eruptive products and the late persists, which suggests that the gap is present in the pre-erutpive system, and not solely a product of degassing-induced crystallization

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