Experimental cannibalization of plagioclase by alkaline basalt magmas
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10477304" target="_blank" >RIV/00216208:11310/23:10477304 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~HRlPnaPP-" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~HRlPnaPP-</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.13133/2239-1002/17931" target="_blank" >10.13133/2239-1002/17931</a>
Alternative languages
Result language
angličtina
Original language name
Experimental cannibalization of plagioclase by alkaline basalt magmas
Original language description
Time-series crystallization/dissolution experiments were conducted on a natural potassic basalt seeded with bytownitic plagioclases (Plg) at atmospheric pressure, in air, at 1180 - 1240 °C and isothermal dwell time up to 20 hours. Plg-seed presence promotes the early formation of new-Plg, dampening the clinopyroxene (Cpx) crystallization. New-Plgs grow at a rate from 10(-6) up to 10(-8) cm s(-1) as the dwell time increases. Seeds overgrow at similar rate. Cpx crystallizes with a delay of at least 3 hours; this has a significant impact on the composition of both residual melt and new-Plgs. For undercooling >35 °C the Cpx delay causes a strong supersaturation of this phase in the melt resulting in a decrease in the new-Plg nucleation rate by 2 orders of magnitude in the 3 h-experiment. In the 15h-run, Cpx coarsening and the decrease of crystallinity suggest the achievement of a near-equilibrium conditions. Cpx growth rate is in the order of 10(-7) cm s(-1) showing very limited variation. Finally, for the investigated superheating (5-15 °C) only the long lasting experiments allows an estimation of Plg dissolution rate (10(-9) cm s(-1)) although changes in the melt composition are already detectable in the 3h-runs. As a whole our results suggest that in natural systems, the takeover of antecrysts/ xenocrysts by a magma can induce on a short time scales, changes in its initial nucleation behavior with remarkable petrological implications for the solidification paths and eruptive dynamics of potassic magmatic systems.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA23-04734S" target="_blank" >GA23-04734S: Experimental determination of Be diffusivity in pyroxenes and plagioclase: a new tool for geospeedometry</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Periodico di Mineralogia
ISSN
0369-8963
e-ISSN
2239-1002
Volume of the periodical
92
Issue of the periodical within the volume
1
Country of publishing house
IT - ITALY
Number of pages
21
Pages from-to
75-95
UT code for WoS article
000967130900001
EID of the result in the Scopus database
2-s2.0-85163877811