Abstract Details
(2020) Lithological Heterogeneities in the Mantle: Origins and Contributions to Magma Genesis (Keynote 3a)
Lambart S & Lang O
https://doi.org/10.46427/gold2020.1405
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03a: Room 1, Wednesday 24th June 00:30 - 00:33
Sarah Lambart
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Otto Lang View abstracts at 3 conferences in series
Otto Lang View abstracts at 3 conferences in series
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Submitted by Antonio Manjon Cabeza Cordoba on Wednesday 24th June 00:28
Hello, You mention that the at high degrees of melting there is no strong effect of water on F, but in fact the melting history of the rock may change considerably (i.e. pressure it started melting, composition of the melt substracted…), do you have any comment regarding this?
Hi Antonio, Thank you for your question. Yes, you are correct, the presence of water can change the melting history and produce melts that are more silica-rich. potentially promoting more melt-rock interaction. So the only valid solution here is to have more experimental data to quantify this, especially on non-peridotitic composition. My point in this talk is, because we do not have these data/model yet, we need to do assumptions; and my-first order hypothesis was that the total magmatic productivity of the source (ie., the amount of magma it will produce) is not significantly affected by (small) amount of water in the source. But again, compositions of the melts will certainly be.
Hello, You mention that the at high degrees of melting there is no strong effect of water on F, but in fact the melting history of the rock may change considerably (i.e. pressure it started melting, composition of the melt substracted…), do you have any comment regarding this?
Hi Antonio, Thank you for your question. Yes, you are correct, the presence of water can change the melting history and produce melts that are more silica-rich. potentially promoting more melt-rock interaction. So the only valid solution here is to have more experimental data to quantify this, especially on non-peridotitic composition. My point in this talk is, because we do not have these data/model yet, we need to do assumptions; and my-first order hypothesis was that the total magmatic productivity of the source (ie., the amount of magma it will produce) is not significantly affected by (small) amount of water in the source. But again, compositions of the melts will certainly be.
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