High pressure trace element partitioning between clinopyroxene and alkali basaltic melts
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10432651" target="_blank" >RIV/00216208:11310/21:10432651 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6t02t.gwzk" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6t02t.gwzk</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gca.2021.04.023" target="_blank" >10.1016/j.gca.2021.04.023</a>
Alternative languages
Result language
angličtina
Original language name
High pressure trace element partitioning between clinopyroxene and alkali basaltic melts
Original language description
We present new experimental data on major and trace element partition coefficients (D) between clinopyroxene and a K-basaltic melt from Procida Island (Campi Flegrei Volcanic District, south Italy). Time-series experiments were conducted at 0.8 GPa and 1080-1250 degrees C aiming to investigate the role of the crystallization kinetics on trace elements partitioning behaviour at a pressure relevant for deep magmatic reservoirs. Results indicate that large ion lithophile elements (LILE) are incompatible {e.g., D(Sr) <= 0.15}, light rare elements {LREE; e.g., D(La) <= 0.20} are always more incompatible than heavy rare elements (HREE), which in some cases result to be compatible with clinopyroxene {e.g., Due D(Dy) = 1.40}; high field strength elements (HFSE) are generally incompatible {D(HFSE) <= 0.8}, while transition elements (TE) range from slightly incompatible {e.g., D(V) = 0.6} to highly compatible {e.g., D(Cr) = 63}. The calculated D values for LILEs, REEs, HFSEs, and TEs tend to decrease with the increase of temperature and to increase with increasing tetrahedrally-coordinated aluminium content, in agreement with the previous studies. Moreover, we observed the influence of the growth rate on the partition coefficients, with the highest D(REE) values calculated in the runs with the highest growth rate (similar to 10(-7) cm s(-1)), due to the less efficient rejection of incompatible elements during rapid crystal growth, that in this study is not linked to disequilibrium conditions, but to the presence of pre-existing nuclei. Additionally, the apparent increase in D(REE) values with time observed in some runs is not referable to a change in time but rather to the different degrees of polymerization, expressed as the ratios NBO/T of these melts, strictly related to a loss of Fe occurred during the experiments, and thus to a different melt viscosity. Finally, the application of the experimental clinopyroxene-melt partition coefficients highlights that the deepest step of the magmatic differentiation in the Campi Flegrei Volcanic District is represented by the fractionation of about 20-30% of a clinopyroxenitic mineral assemblage from a basaltic parental magma.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geochimica et Cosmochimica Acta
ISSN
0016-7037
e-ISSN
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Volume of the periodical
305
Issue of the periodical within the volume
July
Country of publishing house
US - UNITED STATES
Number of pages
24
Pages from-to
282-305
UT code for WoS article
000660120900015
EID of the result in the Scopus database
2-s2.0-85106284286