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(2020) Assembly of Monotonous Basaltic Andesite Magmas at Momotombo Volcano, Nicaragua, and the 2015–2016 Eruption

Tramontano S, Zayac JM, Aldebot S, Espinoza E & Longpré M-A


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Submitted by Chiara Maria Petrone on
HI Marc-Antonie, very interesting work. It seems that homogenous WR composition is a quite common features at many stratovolcanoes. We certainly see this at Popocatepetl, Stromboli and many other volcanoes. Your cpx are really homogenous as well, which is a bit unexpected, since pyroxenes tend to show a quite complex history and heterogeneity, how do you interpret them? From your crystal population it seems that plg but not cpx record mafic injections (apart for the final rim). What does the crystal mush look like at Momotombo?
Hi Chiara, good questions, thanks! Yes the cpx data we have do not show a huge range in composition and Mg# is relatively low. Cores tend to have low Mg# and the crystals are reversely zoned, but some more complexly so than the one shown in the main presentation. These crystals seem to record a fairly evolved, shallow magmatic environment (as also supported by melt inclusions) that got sampled by an intruding andesitic melt. Indeed the plagioclase data record interactions with more mafic liquids at some point in time, but we also have a lot more data there, so we can't exclude that cpx recording similar mafic interactions exist somewhere in the population. The last part of your question is harder to answer with microanalytical data focusing mainly on a single eruption (the 2015-2016 eruption) — I think we would need similar data on multiple eruptions. Presumably the mush is vertically extensive, but the 2015-2016 event seems to have mostly sampled its upper part.

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