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(2020) Suppression of Plagioclase and Clinopyroxene Nucleation in a Basaltic Magma: Insights from Real-Time Synchrotron Tomography

Le Gall N, Arzilli F, Cai B, Polacci M, Vo N, La Spina G, Hartley M, Atwood R, Di Genova D, Nonni S, Llewellin E, Burton M & Lee P


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05e: Room 2, Friday 26th June 23:27 - 23:30

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Submitted by Julia Hammer on Saturday 27th June 00:07
Nice presentation, and interesting results! a comment/ inference about why the stepwise experiments produced cpx whereas the constant-rate experiments did not: The step-cooling experiments promoted faster growth of plagioclase because of higher DT at moment of nucleation. The failure of compositional boundary layer in the liquid surrounding plag to relax caused supersaturation of cpx. By contrast, the constant-rate cooling experiments promoted diffusive relaxation of the boundary layers and this "suppressed" cpx nucleation. If this is correct, the constant-rate cooling experiments produced cpx closer to it's equilibrium-in temperature. I.e., for me this is not an issue of nucleation suppression in the constant-rate (linear cooling) experiments, but rather hastened nucleation in the isothermal (dwell-type) experiments. Is this a possibility you have considered? Or do you have an alternate interpretation?

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