Abstract Details
(2020) Episodic Influx of Mantle-Derived Magma Precedes Eruptions at Cumbre Vieja Volcano, La Palma, Canary Islands
Tramontano S & Longpré M-A
https://doi.org/10.46427/gold2020.2620
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05c: Plenary Hall, Friday 26th June 00:36 - 00:39
Samantha Tramontano
View all 2 abstracts at Goldschmidt2020
View abstracts at 2 conferences in series
Marc-Antoine Longpré View all 7 abstracts at Goldschmidt2020 View abstracts at 9 conferences in series
Marc-Antoine Longpré View all 7 abstracts at Goldschmidt2020 View abstracts at 9 conferences in series
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Submitted by Margaret Hartley on Thursday 25th June 14:07
Hi Samantha. Super interesting talk - thanks! Do you see any changes in the composition of the mafic recharge magma with time, or does it remain constant for all the eruptions you studied?
Hi Margaret, thanks so much for this great question! Short answer - The composition of the mafic recharge magma remains remarkably (!!) constant for all six eruptions. Some additional details & thoughts - Reversely-zoned olivine crystals account for 84% of analyzed crystals (n=74 total crystals, 7-20 per eruption). The composition of these reverse-zones does not vary much (Fo83.5±0.8). If we assume these zones crystallized in equilibrium with a mafic recharge melt, then yes – the mafic recharge magma does not vary much. One more line of evidence - major and trace element compositions of tephra bulk rock and matrix glasses are nearly indistinguishable between samples from all six eruptions. What we also find really interesting is that these eruptions occurred at different vents along the Cumbre Vieja rift zone, which implies a similar process is occurring repeatedly at depth.
Hi Samantha. Super interesting talk - thanks! Do you see any changes in the composition of the mafic recharge magma with time, or does it remain constant for all the eruptions you studied?
Hi Margaret, thanks so much for this great question! Short answer - The composition of the mafic recharge magma remains remarkably (!!) constant for all six eruptions. Some additional details & thoughts - Reversely-zoned olivine crystals account for 84% of analyzed crystals (n=74 total crystals, 7-20 per eruption). The composition of these reverse-zones does not vary much (Fo83.5±0.8). If we assume these zones crystallized in equilibrium with a mafic recharge melt, then yes – the mafic recharge magma does not vary much. One more line of evidence - major and trace element compositions of tephra bulk rock and matrix glasses are nearly indistinguishable between samples from all six eruptions. What we also find really interesting is that these eruptions occurred at different vents along the Cumbre Vieja rift zone, which implies a similar process is occurring repeatedly at depth.
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