Abstract Details
(2020) Olivine-Control Trends: A Mauna Loa Perspective
Rhodes JM
https://doi.org/10.46427/gold2020.2198
The author has not provided any additional details.
05h: Room 2, Saturday 27th June 05:39 - 05:42
J. Michael Rhodes
View abstracts at 11 conferences in series
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Submitted by Aaron Pietruszka on Monday 22nd June 22:01
Hi Mike, I have a technical question about your modeling. Why do you think the most differentiated olivine-controlled melts with low FeO are so poorly represented in the whole rock data (including a lack of magmas that accumulated olivine into these low FeO melts)? (I am referring to the glasses with ~7 wt.% MgO and ?9 wt.% FeO.) What, if anything, does the lack of these bulk magma compositions in the erupted record tell us about the long-term behavior of the plumbing system of Mauna Loa?
Hi Mike, I have a technical question about your modeling. Why do you think the most differentiated olivine-controlled melts with low FeO are so poorly represented in the whole rock data (including a lack of magmas that accumulated olivine into these low FeO melts)? (I am referring to the glasses with ~7 wt.% MgO and ?9 wt.% FeO.) What, if anything, does the lack of these bulk magma compositions in the erupted record tell us about the long-term behavior of the plumbing system of Mauna Loa?
Submitted by Keith Putirka on Wednesday 24th June 17:58
Hi Mike - Nice analysis. There seems to be a continuum of Fo contents from Fo91.5 or so down to very low Fo values. Might that continuum imply that liquids exist all along the "olivine control line", so that even if mixing is dominant, there are some primitive liquids that are fractionating and contributing to that trend? Also, don't glasses from Clague et al. (1991) help make the case for picritic liquids?
Hi Mike - Nice analysis. There seems to be a continuum of Fo contents from Fo91.5 or so down to very low Fo values. Might that continuum imply that liquids exist all along the "olivine control line", so that even if mixing is dominant, there are some primitive liquids that are fractionating and contributing to that trend? Also, don't glasses from Clague et al. (1991) help make the case for picritic liquids?
Submitted by Dennis Geist on Friday 26th June 22:56
Big Mike- Do you have any sense where in the volcano the picritic-melt + olivine mush resides versus the multiply saturate melt? This is a bit of a leading question, because I think that Penny Wieser's talk on Kilauea gets at that. It may be that similar processes are being observed at Kilauea and Mauna Loa.
Big Mike- Do you have any sense where in the volcano the picritic-melt + olivine mush resides versus the multiply saturate melt? This is a bit of a leading question, because I think that Penny Wieser's talk on Kilauea gets at that. It may be that similar processes are being observed at Kilauea and Mauna Loa.
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