Abstract Details
(2020) Are Slab Contributions to the Wedge Oxidized?
Cottrell E, Holycross M & Langmuir C
https://doi.org/10.46427/gold2020.480
The author has not provided any additional details.
04d: Room 1, Thursday 25th June 23:15 - 23:18
Elizabeth Cottrell
View all 4 abstracts at Goldschmidt2020
View abstracts at 13 conferences in series
Megan Holycross View abstracts at 6 conferences in series
Charles Langmuir View all 5 abstracts at Goldschmidt2020 View abstracts at 7 conferences in series
Megan Holycross View abstracts at 6 conferences in series
Charles Langmuir View all 5 abstracts at Goldschmidt2020 View abstracts at 7 conferences in series
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 Cin-Ty Lee on Tuesday 23rd June 00:25
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 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
Submitted by Elizabeth Cottrell on Thursday 25th June 15:38
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!
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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