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Terminal Porosity and the Geochemical Detectability of Plutonic Residues of Melt Extraction

Gao K, Keller B & Ma C

Gao K, Keller B & Ma C (2020) Goldschmidt Abstracts, 2020 786

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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 Changqian Ma on
Thank you for showing a very interesting study! Based on your modelling results, to understand the relationship between volcanic and plutonic rocks, what issues should we pay special attention to when carrying out a granite case study?
Thank you for your question! I think it will be direct if we could find a continuous geological section that includes volcanic and plutonic rocks. We will be able to do meticulous mineralogical, petrological, and geochemical work on it.

Submitted by Calvin Miller on
Very interesting, thank you for your presentation! A couple of questions: (1) I agree that extracted melts and cumulates are likely to be readily resolvable; are you saying that the rock record reveals this distinction, or that there is little or no record of this distinction?; (2) Are you aware of a number of recent papers that purport to have identified erupted remobilized cumulate magmas that are complementary to high silica rhyolites? I believe that they could be relevant to your study.
Thank you for your questions! The first question, from global perspectives, the rock record shows little even no record of the distinction between volcanic and plutonic rocks; and the second, we have read some of those papers, they are outstanding work! We think remobilized cumulates (i.e., cumulates that end up in a volcanic rock) could definitely help explain the lack of offset in composition between volcanic and plutonic. We saw potential evidence of remobilized cumulates at Turkey Creek as well (doi.org/10.1130/G37539.1 — the hypabyssal monzonite porphyry was been interpreted as a residue of melt extraction, which would imply that its dacitic eruptive equivalent is also a remobilized cumulate / residue).

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