(2020) Are Slab Contributions to the Wedge Oxidized?
Cottrell E, Holycross M & Langmuir C
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04d: Room 1, Thursday 25th June 23:15 - 23:18
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hi Liz, I very much like the idea of a V3+ proxy, which I had never thought of. The MORB V/V3+ being constant is very convincing. The question I have, however, is whether V/V3+ remains constant during differentiation in arcs. If it doesn't, it's problematic because one ultimately must use evolved magmas for arcs and the V/V3+ has changed from its primary magma. Cin-Ty
Hi Cin-Ty -- thanks for the great question. Yes, V/V3+ remains constant during differentiation in arcs down to MgO = 4-5 wt.%. However, out of an abundance of caution, we are looking at MgO > 6 wt.% and excluding samples with Dy/Yb > 2 to avoid samples with significant garnet in the residue, though this precaution seems unnecessary, based on the empirical data. This is best shown with figures that I have uploaded here: https://tinyurl.com/ybhr2ovg. I also want to shout out that my presentation has a typo on the y axis at minute 5:55. Axis should = V3+proxy. I mention this in the uploaded file as well. Thanks for the insightful question!
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